May 2020

World's Oldest Bug is Fossil Millipede From Scotland

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<tr><td class="tr-caption" style="text-align: center;">UT Austin scientists found that the fossil millipede Kampecaris obanensis was 425 million years old. Credit: British Geological Survey</td></tr>
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<span style="font-family: "georgia" , "times new roman" , serif;">Some millipedes can live for years, but one particular millipede inadvertently made paleontology history 425 million years after its demise. </span><br />
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A 425-million-year-old millipede fossil from the Scottish island of Kerrera is the world's oldest "bug" -- older than any known fossil of an insect, arachnid or other related creepy-crawly, according to researchers at The University of Texas at Austin.<br />
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The findings offer new evidence about the origin and evolution of bugs and plants, suggesting that they evolved much more rapidly than some scientists believe, going from lake-hugging communities to complex forest ecosystems in just 40 million years.<br />
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"It's a big jump from these tiny guys to very complex forest communities, and in the scheme of things, it didn't take that long," said Michael Brookfield, a research associate at UT Austin's Jackson School of Geosciences and adjunct professor at the University of Massachusetts Boston. "It seems to be a rapid radiation of evolution from these mountain valleys, down to the lowlands, and then worldwide after that."<br />
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The research was recently published in the journal Historical Biology. Brookfield led the study with co-authors including Elizabeth Catlos, an associate professor in the Jackson School's Department of Geological Sciences, and Stephanie Suarez, a doctoral student at the University of Houston who made improvements to the fossil dating technique used in the study when she was an undergraduate at the Jackson School.<br />
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The team found that the ancient millipede fossil is 425 million years old, or about 75 million years younger than the age other scientists have estimated the oldest millipede to be using a technique known as molecular clock dating, which is based on DNA's mutation rate. Other research using fossil dating found that the oldest fossil of a land-dwelling, stemmed plant (also from Scotland) is 425 million years old and 75 million years younger than molecular clock estimates.<br />
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Although it's certainly possible there are older fossils of both bugs and plants, Brookfield said that the fact they haven't been found -- even in deposits known for preserving delicate fossils from this era -- could indicate that the ancient millipede and plant fossils that have already been discovered are the oldest specimens.<br />
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If that's the case, it also means both bugs and plants evolved much more rapidly than the timeline indicated by the molecular clock. Bountiful bug deposits have been dated to just 20 million years later than the fossils. And by 40 million years later, there's evidence of thriving forest communities filled with spiders, insects and tall trees.<br />
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"Who is right, us or them?" Catlos said. "We're setting up testable hypotheses -- and this is where we are at in the research right now."<br />
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Given their potential evolutionary significance, Brookfield said that he was surprised that this study was the first to address the age of the ancient millipedes.<br />
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Suarez said a reason could be the difficulty of extracting zircons -- a microscopic mineral needed to precisely date the fossils -- from the ashy rock sediment in which the fossil was preserved. As an undergraduate researcher at the Jackson School, Suarez developed a technique for separating the zircon grain from this type of sediment. It's a process that takes practice to master. The zircons are easily flushed away when trying to loosen their grip on the sediment. And once they are successfully released from the surrounding rock, retrieving the zircons involves an eagle-eyed hunt with a pin glued to the tip of a pencil.<br />
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"That kind of work trained me for the work that I do here in Houston," Suarez said. "It's delicate work."<br />
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As an undergraduate, Suarez used the technique to find that a different millipede specimen, thought to be the oldest bug specimen at the time, was about 14 million years younger than estimated -- a discovery that stripped it of the title of oldest bug. Using the same technique, this study passes the distinction along to a new specimen.<br />
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The research was funded by the Jackson School, the Max Kade Foundation and DFG Scientific Instrumentation and Information Technology.<br />
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<u><i><span style="font-family: "trebuchet ms" , sans-serif;">The above story is based on <a href="http://www.jsg.utexas.edu/news/2020/05/worlds-oldest-bug-is-fossil-millipede-from-scotland/" rel="nofollow" target="_blank">Materials</a> provided by <a href="http://www.utexas.edu/" rel="nofollow" target="_blank">University of Texas at Austin</a>.</span></i></u></div>

World's Oldest Bug is Fossil Millipede From Scotland

UT Austin scientists found that the fossil millipede Kampecaris obanensis was 425 million years old. Credit: British Geological Survey ...

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Thunderegg: Ordinary Rocks With Crystal Surprise Inside!

gemstones, Mineralogy 7:35 PM

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<tr><td style="text-align: center;"><a href="https://1.bp.blogspot.com/-6xmj8_doRCk/Xsvx8HnkdgI/AAAAAAAASQQ/4FEfUPxjjJgWaA_z2OuQEygop81A9_rDwCLcBGAsYHQ/s1600/Thunder%2Begg%2Bis%2Ba%2Bnodule-like%2Brock%2B-geology%2Bin%2B%25281%2529.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Thunderegg: Ordinary Rocks With Crystal Surprise Inside!" border="0" data-original-height="839" data-original-width="1024" height="524" src="https://1.bp.blogspot.com/-6xmj8_doRCk/Xsvx8HnkdgI/AAAAAAAASQQ/4FEfUPxjjJgWaA_z2OuQEygop81A9_rDwCLcBGAsYHQ/w640-h524/Thunder%2Begg%2Bis%2Ba%2Bnodule-like%2Brock%2B-geology%2Bin%2B%25281%2529.jpg" title="Thunderegg: Ordinary Rocks With Crystal Surprise Inside!" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Thunderegg: Ordinary Rocks With Crystal Surprise Inside! . Credit: Bill The Eggman</td></tr>
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<span style="font-size: small;"><br />
</span> <span style="font-size: small;"><br />
</span> A <b>thunderegg </b>(or thunder egg) is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers. </div>
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Thundereggs are rough spheres, most about the size of a baseball—though they can range from a little more than a centimeter to over a meter across. They usually contain centres of chalcedony which may have been fractured followed by deposition of agate, jasper or opal, either uniquely or in combination.</div>
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Thundereggs usually look like ordinary rocks on the outside, but slicing them in half and polishing them may reveal intricate patterns and colours. A characteristic feature of thundereggs is that (like other agates) the individual beds they come from can vary in appearance, though they can maintain a certain specific identity within them.</div>
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<span style="font-family: Georgia, "Times New Roman", serif;">Thunderegg Vs. Geode</span></h4>
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Thunderegg is not synonymous with either geode or agate. A <b>geode </b>is a simple term for a rock with a hollow in it, often with crystal formation/growth. A thunderegg on the other hand is a specific geological structure. A thunderegg may be referred to as a <b>geode </b>if it has a hollow in it, but not all geodes are thundereggs because there are many different ways for a hollow to form. Similarly, a thunderegg is just one of the forms that agate can assume.</div>
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<span style="font-family: Georgia, "Times New Roman", serif;">Formation</span></h4>
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Thundereggs are found in flows of rhyolite lava. They form in gas pockets in the lava, which act as molds, from the action of water percolating through the porous rock carrying silica in solution. The cooled bubbles were gradually filled by water percolating through the porous rock carrying rich quantities of silica (quartz). </div>
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The deposits lined and filled the cavity, first with a darker matrix material, then an inner core of agate or chalcedony. The various colors come from differences in the minerals found in the soil and rock that the water has moved through.<br />
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The agate, chalcedony, and quartz veins and open-space-fillings within voids in the spherulites formed later by multiple cycles of hydrothermal fluids. Hydrothermal fluids are a mixture of late-stage fluids escaping the magma and local ground water. <br />
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The fluids contain some elements from the original magma and also dissolved minerals from the country rock. The amount of ions that the fluid can dissolve depends upon pH, temperature, pressure, and composition of the fluid. The hydrothermal fluids move through fractures in the rocks, which crosscut the igneous textures, and form veins or banded agate, chalcedony, and quartz. <br />
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Some of these fluids seep through microscopic pores and into spherulites and gas pockets in the volcanic rocks, and they precipitate crystals along the walls of the cavity, forming geodes and geode-like spherulites. Other fluids seep through fractures and gas and other void spaces in the spherulites. Because of their formation by multiple hydrothermal events, each thunderegg provides clues as to its unique formation.<br />
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<tr><td style="text-align: center;"><a href="https://1.bp.blogspot.com/-5UaIQKEGe74/XsvycKC2kiI/AAAAAAAASQY/sCfgimsuLsI2wAsY4gknxEsEwZIS_ADxgCLcBGAsYHQ/s1600/Thunderegg%2BAgate.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Thunderegg: Ordinary Rocks With Crystal Surprise Inside!" border="0" data-original-height="960" data-original-width="844" height="400" src="https://1.bp.blogspot.com/-5UaIQKEGe74/XsvycKC2kiI/AAAAAAAASQY/sCfgimsuLsI2wAsY4gknxEsEwZIS_ADxgCLcBGAsYHQ/w351-h400/Thunderegg%2BAgate.jpg" width="351" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Credit: John Meinen</td></tr>
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<span style="font-family: Georgia, "Times New Roman", serif;">How to Spot Thundereggs?</span></h4>
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Though thundereggs appear as rocks, they can be easily identifiable by the abnormally round and bumpy brown-gray exteriors. Usually, thundereggs lie relatively close to the Earth's surface, embedded in the clay of the tuff, where they were formed. During the time, the tuff has been decayed to soft mud and clay, making rock-like thundereggs noticeable.<span style="font-family: Georgia, "Times New Roman", serif;"><br /></span><h4>
<span style="font-family: Georgia, "Times New Roman", serif;">Where to Find Thundereggs?</span></h4>
Thundereggs are found globally where conditions are optimal. In the US, Oregon is one of the most famous thunderegg locations. The regions of Central and Eastern Oregon are the most popular in the world for thundereggs hunting. The best productive areas are located in the high desert of Central Oregon near Prineville, Madras and in the Ochoco National Forest (Central Oregon). Also, thundereggs can be collected in Succor Creek Creek Canyon (Eastern Oregon)<ul style="text-align: left;">
<li><b>White Fir Springs</b></li>
<li><b>White Rock Springs</b></li>
<li><b>Whistler Springs</b></li>
<li><b>Richardson Rock Ranch</b></li>
<li><b>Succor Creek Canyon</b></li>
<li><b>Alvord Desert</b></li>
<li><b>Owyhee Reservoir  </b></li>
</ul>
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<span style="color: blue;"><b><span style="font-family: "georgia" , "times new roman" , serif;">See also:</span></b></span></div>
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<span style="font-family: "georgia" , "times new roman" , serif;"><a href="https://www.geologyin.com/2018/07/where-to-find-sunstone-in-oregon.html" target="_blank">Where to Find Sunstone in Oregon?</a></span></div>
<div style="text-align: left;">
<span style="font-family: "georgia" , "times new roman" , serif;"><a href="https://www.geologyin.com/2017/07/dig-your-own-unique-opals-from-nevada.html" target="_blank">Dig Your Own Unique Opals From Nevada </a></span></div>
<div style="text-align: left;">
<a href="https://www.geologyin.com/2017/06/where-to-find-opals-in-oregon.html" target="_blank"><span style="font-family: "georgia" , "times new roman" , serif;">Opals in Oregon</span></a></div>
</div>

Thunderegg: Ordinary Rocks With Crystal Surprise Inside!

Thunderegg: Ordinary Rocks With Crystal Surprise Inside! . Credit: Bill The Eggman A thunderegg (or thunder egg) is a nodule-like ...

Giant Tectonic Plate Under Indian Ocean is Breaking in Two

earth, Geology 11:36 PM

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<tr><td class="tr-caption" style="text-align: center;">This map shows the seafloor topography and deformation below it at a fracture in the Wharton Basin. This fracture likely formed when the ocean crust was formed, but now this fracture is being turned into a new plate boundary. The purple-colored depressions are indicative of a strike-slip fault, which is the same kind of fault as the San Andreas Fault in California.  (Image credit: Aurélie Coudurier-Curveur; Coudurier‐Curveur, A. et al. Geophysical Research Letters (2020); CC BY 4.0)</td></tr>
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The giant tectonic plate under the Indian Ocean is going through a rocky breakup … with itself.<br />
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Bathymetric and seismic data point to a new plate boundary in a fracture-riddled zone beneath the northern Indian Ocean.<br />
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Tectonic plates blanket the Earth like a patchwork quilt. Now, researchers think they’ve found a new plate boundary—a line of stitching in that tectonic quilt—in the northern Indian Ocean. This discovery, made using bathymetric and seismic data, supports the hypothesis that the India-Australia-Capricorn plate is breaking apart, the team suggests.<br />
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<span style="font-family: "georgia" , "times new roman" , serif;">Earthquakes in Unexpected Places</span></h4>
In 2012, two enormous earthquakes occurred near Indonesia. But these massive temblors—magnitudes 8.6 and 8.2—weren’t associated with the region’s notorious Andaman-Sumatra subduction zone. Instead, they struck within the India-Australia-Capricorn plate, which made them unusual because most earthquakes occur at plate boundaries.<br />
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These earthquakes “reactivated the debate” about the India-Australia-Capricorn plate, said Aurélie Coudurier-Curveur, a geoscientist at the Institute of Earth Physics of Paris.<br />
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Some scientists have proposed that this plate, which underlies most of the Indian Ocean, is breaking apart. That’s not a wholly unexpected phenomenon because this plate is being tugged in multiple directions, said Coudurier-Curveur. Its eastern extent is sliding under the Sunda plate, but its northern portion is buckling up against the Himalayas, which are acting like a backstop.<br />
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“There’s a velocity difference that is potentially increasing,” said Coudurier-Curveur, who completed this work while at the Earth Observatory of Singapore at Nanyang Technological University.<br />
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<span style="font-family: "georgia" , "times new roman" , serif;">Zooming in on Fractures</span></h4>
Coudurier-Curveur and her colleagues studied one particularly fracture riddled region of the India-Australia-Capricorn plate near the Andaman-Sumatra subduction zone. They used seismic reflection imaging and multibeam bathymetry, which involve bouncing sound waves off sediments and measuring the returning signals, to look for structures at and below seafloor consistent with an active fault.<br />
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Along one giant crack that the team dubbed F6a, Coudurier-Curveur and her colleagues found 60 pull-apart basins, characteristic depressions that can form along strike-slip plate boundaries. The team showed that the basins followed a long, linear track that passed near the epicenters of both of the 2012 earthquakes.<br />
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“It’s at least 1,000 kilometers,” said Coudurier-Curveur. “It might be even longer, but we don’t have the data to show where it extends.” This feature, the team surmised, was consistent with being a plate boundary. An important next step was to estimate its slip rate.<br />
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<span style="font-family: "georgia" , "times new roman" , serif;">Slower Than San Andreas</span></h4>
To do that, the scientists relied on two quantities: the length of the largest, and presumably oldest, pull-apart basin (roughly 5,800 meters) and the duration of the most recent episode of fault activity (roughly 2.3 million years). By dividing the length of the pull-apart basin by this time interval, they calculated a maximum slip rate of about 2.5 millimeters per year. That’s roughly tenfold slower than the rate along other strike-slip plate boundaries like the San Andreas Fault but not much slower than the slip rates of the Dead Sea Fault and the Owen Fracture Zone, the team noted.<br />
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On the basis of that slip rate, Coudurier-Curveur and her collaborators estimated the return interval for an earthquake like the magnitude 8.6 one reported in April 2012. Assuming that such an event releases several tens of meters of coseismic slip, a similar earthquake might occur every 20,000 years or so, said Coudurier-Curveur. “Once you release the stress, you need a number of years to build that stress again.”<br />
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<br />
<u><i><span style="font-family: "trebuchet ms" , sans-serif;">The above story is based on <a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL087362" rel="nofollow" target="_blank">materials </a>provided by <a href="https://agupubs.onlinelibrary.wiley.com/" rel="nofollow" target="_blank">American Geophysical Union</a>.</span></i></u></div>

Giant Tectonic Plate Under Indian Ocean is Breaking in Two

This map shows the seafloor topography and deformation below it at a fracture in the Wharton Basin. This fracture likely formed when the ...

Dumortierite Quartz: Rare Blue Quartz

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Electric-blue Veszelyite Crystals

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<p></p><table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto;"><tbody><tr><td style="text-align: center;"><a href="https://1.bp.blogspot.com/-d3OgxDOndvc/X_MwxyiMzKI/AAAAAAAASvc/uLa5bXlcSC4JInHD5FBmyt5TenwV2Jy4QCLcBGAsYHQ/s1250/Veszelyite.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Electric-blue Veszelyite Crystals" border="0" data-original-height="938" data-original-width="1250" height="300" src="https://1.bp.blogspot.com/-d3OgxDOndvc/X_MwxyiMzKI/AAAAAAAASvc/uLa5bXlcSC4JInHD5FBmyt5TenwV2Jy4QCLcBGAsYHQ/w400-h300/Veszelyite.jpg" title="Electric-blue Veszelyite Crystals" width="400" /></a></td></tr><tr><td class="tr-caption" style="text-align: center;">Electric-blue Veszelyite Crystals. Credit: Christian Rewitzer</td></tr></tbody></table><p><b><span style="font-family: "georgia" , "times new roman" , serif;">Veszelyite </span></b><br /> A <b>rare </b>secondary Cu-Zn mineral occurring in the oxidised zones of base metal deposits. Veszelyite is a rare phosphate and this beautiful specimen is richly sprinkled with sharp, dark electric-blue veszelyite crystals. <br />
<span style="font-family: "georgia" , "times new roman" , serif;"><span style="font-size: small;">Formula: <span style="font-family: times;">Cu<sup>2+</sup><sub>3</sub>PO<sub>4</sub>(OH)<sub>3</sub>·2H<sub>2</sub>O</span></span><br />System: Monoclinic<br />Colour: Green, blue, greenish ...<br />Hardness: 3½ - 4</span></p><p><span style="font-family: "georgia" , "times new roman" , serif;">From: Laochang Mine, Gejiu County, Yunnan Province, China</span></p><p></p>

Electric-blue Veszelyite Crystals

Electric-blue Veszelyite Crystals. Credit: Christian Rewitzer Veszelyite A rare secondary Cu-Zn mineral occurring in the oxidised zones of ...

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Fascinating Utahite with Xocolatlite Crystals

Minerals 5:43 PM

<p><table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto;"><tbody><tr><td style="text-align: center;"><a href="https://1.bp.blogspot.com/-GyIOfIwwfuI/X9jL0c3Yy2I/AAAAAAAASs0/VD4cBP--gCYifuYjcGxljeR0y_p3Xn_1QCLcBGAsYHQ/s1100/20201207_171942%2Bcopy%2B%25281%2529.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="909" data-original-width="1100" height="528" src="https://1.bp.blogspot.com/-GyIOfIwwfuI/X9jL0c3Yy2I/AAAAAAAASs0/VD4cBP--gCYifuYjcGxljeR0y_p3Xn_1QCLcBGAsYHQ/w640-h528/20201207_171942%2Bcopy%2B%25281%2529.jpg" width="640" /></a></td></tr><tr><td class="tr-caption" style="text-align: center;">Photo: Joy Desor Mineralanalytik</td></tr></tbody></table> </p><p><br /></p><p>Intense blue utahite groups on baryte with minor dagenaisite and red xocolatlite. Associated with xocolatlite is svanbergite. </p><p><b>Locality:</b> North Star Mine, Mammoth, Tintic District, Juab County, Utah, United States of America<br /><br /><b>Utahite </b>is an extremely rare secondary copper zinc tellurate mineral found as a product of oxidation. Its chemical formula is Cu₅Zn₃(Te⁶⁺O₄)₄(OH)₈•7H₂O. It was first described in 1997 for an occurrence in the Centennial Eureka mine, one mile southeast of Eureka, Tintic District, Juab County, Utah, US.</p><p><br /></p><p><b>Xocolatlite </b>is a sulfate mineral named for its chocolatey appearance. Discovered in the La Bambolla gold mine of Moctezuma, Sonora, Mexico, Xocolatlite's name is derived from the Nahuatl word xocolatl, a drink made from cocoa, water, and chili.  chemical formula is: Ca<sub style="border: 0px; font-family: inherit; font-size: 0.5em; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; outline: 0px; padding: 0px; position: relative; top: 0.4em; vertical-align: 0px;">2</sub>Mn<sup style="border: 0px; bottom: 0.4em; font-family: inherit; font-size: 0.5em; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; outline: 0px; padding: 0px; position: relative; vertical-align: 0px;">4+</sup><sub style="border: 0px; font-family: inherit; font-size: 0.5em; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; outline: 0px; padding: 0px; position: relative; top: 0.4em; vertical-align: 0px;">2</sub>(Te<sup style="border: 0px; bottom: 0.4em; font-family: inherit; font-size: 0.5em; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; outline: 0px; padding: 0px; position: relative; vertical-align: 0px;">6+</sup>O<sub style="border: 0px; font-family: inherit; font-size: 0.5em; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; outline: 0px; padding: 0px; position: relative; top: 0.4em; vertical-align: 0px;">6</sub>)<sub style="border: 0px; font-family: inherit; font-size: 0.5em; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; outline: 0px; padding: 0px; position: relative; top: 0.4em; vertical-align: 0px;">2</sub>·H<sub style="border: 0px; font-family: inherit; font-size: 0.5em; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; margin: 0px; outline: 0px; padding: 0px; position: relative; top: 0.4em; vertical-align: 0px;">2</sub>O</p><div class="field field-name-field-mineral-strunz10 field-type-text field-label-inline clearfix" style="-webkit-text-stroke-width: 0px; background-color: white; border: 0px; color: #15161a; font-family: Verdana, Arial, sans-serif; font-size: 12px; font-stretch: inherit; font-style: normal; font-variant-caps: normal; font-variant-east-asian: inherit; font-variant-ligatures: normal; font-variant-numeric: inherit; font-weight: 400; letter-spacing: normal; line-height: inherit; margin: 0px; orphans: 2; outline: 0px; padding: 0px; text-align: start; text-decoration-color: initial; text-decoration-style: initial; text-decoration-thickness: initial; text-indent: 0px; text-transform: none; vertical-align: baseline; white-space: normal; widows: 2; word-spacing: 0px;"><br class="Apple-interchange-newline" /><br /></div>

Fascinating Utahite with Xocolatlite Crystals

Photo: Joy Desor Mineralanalytik Intense blue utahite groups on baryte with minor dagenaisite and red xocolatlite. Associated with xocolat...

Hundreds of Towering Hydrothermal Chimneys Discovered on Seafloor Off Washington

earth, Geology, Researches 11:24 PM

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At the Endeavour Segment of the Juan de Fuca Ridge, about 350 kilometers (220 miles) northwest of Washington State, the seafloor is ripping apart.<br /><br />Magma beneath the seafloor heats water within the surrounding bedrock, which emerges from the seafloor in the form of underwater seeps and geysers known as hydrothermal vents. When this superheated, mineral-rich water comes in contact with near-freezing seawater, the dissolved minerals crystalize, creating a wonderland of spires and hydrothermal chimneys up to 25 meters (80 feet) tall.<br /><br />Marine geologists and biologists have studied Endeavour hydrothermal vent field since 1982 using human-occupied submersibles and underwater robots. Early on, they discovered that the field was very active, with lots of vents and chimneys. But because of the difficult access, total darkness, and murky water, no one had ever mapped all the vents in this area or even determined how many existed. But a recent paper by MBARI geologists and collaborators shows that there are almost 600 chimneys in this area.<br /><br />The Endeavour vents are all located in a long, narrow valley about 14 kilometers (8.6 miles) long and 1.5 kilometers (0.9 miles) wide. Before this study, scientists from the US and Canada had named about 47 active hydrothermal vents, most of which lie within five major vent fields. They gave these vent fields fanciful names such as Mothra, Salty Dawg, and Sasquatch. They also discovered that this region not only had vast numbers of chimneys, but also had some of the tallest hydrothermal chimneys known on any mid-ocean ridge in the world. The tallest of these chimneys, "Godzilla," reached a height of 45 meters (150 feet) before it toppled over in 1995.<br /><br />Over the years, the Endeavour hydrothermal vent fields were mapped using sonar on ships and underwater robots. However, none of these surveys had high enough resolution to detect individual chimneys over large areas of seafloor. It was not until MBARI's autonomous underwater vehicle (AUV) D. Allan B. mapped the area at about 1.25-meter (4-foot) resolution that geologists were able to see the huge number of chimneys in this area, many of which were located outside known active vent fields.<br /><br />MBARI researchers were able to achieve this feat by flying D. Allan B. just 50 meters (160 feet) over the rugged seafloor during seven surveys in 2008 and 2011. Overall, the AUV completed 140 hours of dives and mapped about 62 square kilometers (24 square miles) of the seafloor.<br /><br />MBARI researchers searched through the data from the AUV to identify all chimneys taller than three meters (the minimum height that could be reliably separated from background topography). They were amazed to find 572 chimneys. Many of the newly discovered chimneys were close to vent sites that had been studied for decades.<br /><br />As David Clague, the lead author on the new paper, explained, "It's very hard to see down there because all the particulates in the water create a kind of haze. I remember there was one well-studied chimney where the composition of the fluids seemed to vary from one research dive to the next. It wasn't until we did our detailed mapping that people realized they had actually been sampling at two different chimneys. They apparently would encounter one chimney or the other depending on what direction they approached the site."<br /><br />MBARI's mapping effort revealed many large, and presumably active, chimneys, the tallest being at least 27 meters (90 feet) high. But the majority of the chimneys were smaller--less than eight meters (26 feet) high--and the researchers believe many are inactive (no longer releasing fluids).<br /><br />Active chimneys typically form where superheated water (over 300 degrees Centigrade; 570 degrees Fahrenheit) flows up through cracks in the seafloor. If this flow is strong and lasts long enough, the chimney may grow taller and taller until it becomes unstable and topples over. However, many seafloor cracks and chimneys become clogged by mineral deposits. At this point, the chimney becomes inactive and stops growing, but may remain standing for hundreds of years. Meanwhile, the fluids from the clogged chimney find their way upward through different cracks in the seafloor to form new chimneys nearby.<br /><br />To figure out what makes the Endeavour Segment unique, the researchers compared the types of chimneys at Endeavour with those found at the Alarcón Rise (near the south end of the Gulf of California), another spreading center that MBARI has mapped in detail. They found that the Endeavour Field had many more chimneys, but a lower proportion of active chimneys.<br /><br />Clague and his coauthors suggest that the Endeavour Segment has lots of inactive chimneys because, over the last several thousand years, this area has only had a few small volcanic eruptions, and the lava from these eruptions did not bury the chimneys. In contrast, at the Alarcón Rise, large amounts of lava have erupted from the seafloor, burying or destroying older chimneys, so only the youngest and most active chimneys remain.<br /><br />Based on their work at Endeavour and other mid-ocean ridges, the researchers propose that these ridges may go through three phases of evolution:<br /><br />A magmatic phase, lasting up to tens of thousands of years, when large amounts of magma erupt and cover the seafloor with lava.<br /><br />A tectonic phase, lasting perhaps 5,000 years, when the magma supply slows, and the seafloor cools and contracts, while spreading continues deeper in the crust. During this phase, the axial valley sinks, and numerous cracks and faults form in the seafloor.<br />A hydrothermal phase, lasting just a few thousand years, when resurgent magma below the surface heats fluids that percolate upwards through seafloor cracks, forming large numbers of vents.<br /><br />The researchers think that the Endeavour area has been in a hydrothermal phase for about the last 2,000 years. However, they suspect it may be entering a new magmatic phase, which means that the area could see more volcanic eruptions in the future. When this happens many of the chimneys they mapped will be buried under new lava flows, and the fractured rocks that currently allow substantial amounts of fluid to rise to the surface will be mostly sealed.<br /><br />Meanwhile, geologists studying the Endeavour Segment will be able to use MBARI's new maps to plan their research dives and decide where to put monitoring equipment on the seafloor.<br /><br />Data from MBARI's mapping effort has also been used by collaborators at the University of Ottawa and GEOMAR to estimate the volume and mass of the hydrothermal deposits in the Endeavour chimneys. Such estimates are critical for understanding the distribution of metal-rich rocks at hydrothermal vents, some of which have been targeted for deep-sea mining. However seafloor mining is unlikely within the Endeavour vent fields. In 2003, the government of Canada declared the active vent sites and nearby areas a marine-protected area.<br />
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<u><i><span style="font-family: "Trebuchet MS", sans-serif;">The above story is based on <a href="http://astrobiology.com/2020/05/hundreds-of-hydrothermal-chimneys-discovered-on-the-seafloor-off-the-pacific-northwest.html" rel="nofollow" target="_blank">materials </a>provided by <a href="https://www.mbari.org/" rel="nofollow" target="_blank">Monterey Bay Aquarium Research Institute.</a></span></i></u></div>

Hundreds of Towering Hydrothermal Chimneys Discovered on Seafloor Off Washington

At the Endeavour Segment of the Juan de Fuca Ridge, about 350 kilometers (220 miles) northwest of Washington State, the seafloor is rip...

Conichalcite And Olivenite on Matrix

Minerals 6:07 PM

<p></p><table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto;"><tbody><tr><td style="text-align: center;"><a href="https://1.bp.blogspot.com/-ezfJQmyHA3E/YAWlDBsYsyI/AAAAAAAASw4/KSCT4X0ZFJM6q8Lm6uuxtuigJ1_7emVlQCLcBGAsYHQ/s900/Conichalcite%2BAnd%2BOlivenite%2Bon%2BMatrix.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Conichalcite And Olivenite on Matrix" border="0" data-original-height="596" data-original-width="900" height="424" src="https://1.bp.blogspot.com/-ezfJQmyHA3E/YAWlDBsYsyI/AAAAAAAASw4/KSCT4X0ZFJM6q8Lm6uuxtuigJ1_7emVlQCLcBGAsYHQ/w640-h424/Conichalcite%2BAnd%2BOlivenite%2Bon%2BMatrix.jpg" title="Conichalcite And Olivenite on Matrix" width="640" /></a></td></tr><tr><td class="tr-caption" style="text-align: center;">Conichalcite And Olivenite on Matrix. Photo Credit: DPJ Minéraux</td></tr></tbody></table> <br /><p></p><p> </p><p><b>Conichalcite</b>, CaCu, is a relatively common arsenate mineral related to duftite. It is green, often botryoidal, and occurs in the oxidation zone of some metal deposits. It occurs with limonite, malachite, beudantite, adamite, cuproadamite, olivenite and smithsonite.<br /> </p><p><b>Olivenite </b>is a copper arsenate mineral, formula Cu₂AsO₄OH. It crystallizes in the monoclinic system, and is sometimes found in small brilliant crystals of simple prismatic habit terminated by domal faces. </p><p><br /></p><p>From: Serpieri Mine, Kamariza, Agios Konstantinos, Lavrion District, Attiki Prefecture, Greece<br /><br /><br /></p>