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Geologists Unravel the Mysteries of Australia’s Rare Pink Diamonds
Oxytropidoceras posted a topic in Rocks & Minerals
Earth's biggest cache of pink diamonds formed in the breakup of the 1st supercontinent 'Nuna' by Stephanie Pappas, LIveScience, September 19, 2023 Geologists Unravel the Mysteries of Australia’s Rare Pink Diamonds The dazzling, blush-colored gems likely emerged from Earth’s mantle some 1.3 billion years ago, when a supercontinent named Nuna broke up, study suggests by Sarah Kuta, Smithsonian, September 20, 2023 The open access paper is: Olierook, H.K.H., Fougerouse, D., Doucet, L.S. et al. Emplacement of the Argyle diamond deposit into an ancient rift zone triggered by supercontinent breakup. Nat Commun 14, 5274 (2023). https://doi.org/10.1038/s41467-023-40904-8 Yours, Paul H.-
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'Big Ugly Diamond' discovered by Arkansas state park visitor
Oxytropidoceras posted a topic in Rocks & Minerals
'Big Ugly Diamond' discovered by Arkansas state park visitor BBC News, March 16, 2023 Hausel, W.D., 2008. Diamond Deposits Of The North American Craton–An Overview. Topics in Wyoming Geology: Wyoming Geological Association Guidebook, 2008, Pages 103-138 Howard, J.M. and Hanson, W.D., 2008. Geology of the Crater of Diamonds State Park and Vicinity, Pike County, Arkansas. Arkansas Geological Survey. Dunn, D., 2003, June. Diamond evaluation of the Prairie Creek lamproite province, Arkansas, USA. In International Kimberlite Conference: Extended Abstracts (Vol. 8). Dunn, D.P., 2002. Xenolith mineralogy and geology of the Prairie Creek lamproite province, Arkansas. The University of Texas at Austin. Clift, P.D., Heinrich, P., Dunn, D., Jacobus, A. and Blusztajn, J., 2018. The Sabine block, Gulf of Mexico: promontory on the North American margin?. Geology, 46(1), pp.15-18. Howard, J.M., 1996. Finding Diamonds in Arkansas. Arkansas Geological Commission. Yours, Paul H.-
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Largest pink diamond in 300 years unearthed in Angola
Oxytropidoceras posted a topic in Rocks & Minerals
The Largest Pink Diamond in 300 Years Has Just Been Unearthed Barndon Spektor, Science Alert, July 29, 202 Miners just discovered the largest pink diamond in more than 300 years By Brandon Specktor published 3 days ago The diamond will likely become the most expensive gemstone ever sold Historic 170 carat diamond recovered at Lulo Mine, Angola Lucapa Diamond Company Limited Yours, Paul H.-
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4.38 carat yellow diamond found at Arkansas’ Crater of Diamonds State Park
Oxytropidoceras posted a topic in Rocks & Minerals
A California woman discovered a 4.38 carat yellow diamond Publications: Dunn, D.P., 2002. Xenolith mineralogy and geology of the Prairie Creek lamproite province, Arkansas. The University of Texas at Austin. Dunn (2002) PDF Dunn, D., 2003, June. Diamond evaluation of the Prairie Creek lamproite province, Arkansas, USA. In International Kimberlite Conference: Extended Abstracts (Vol. 8). Online Publications of Dr. Dennis Dunn Howard, J. M., 1996, Find Diamonds in Arkansas. Arkansas Geological Survey, Little Rock, Arkansas Geologic Map of the Crater of Diamonds State Park and Vicinity, Pike County, Arkansas Previous posts about Crater of Diamonds State Park, Arkansas Yours, Paul H.- 2 replies
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Visitor finds 4.49-carat diamond at Crater of Diamonds State Park
Oxytropidoceras posted a topic in Rocks & Minerals
Visitor finds 4.49-carat diamond at Crater of Diamonds State Park, White River Now, November 3, 2020 Fayetteville man finds 4.49-carat diamond at Crater of Diamonds, ABC Channel 40/29 News Older articles are: A visitor thought he found a piece of glass at an Arkansas state park. It was a 9-carat diamond. It’s the second-largest diamond ever found at Crater of Diamonds State Park. Washington Post, Sept. 29, 2020 UPI News, Sept. 24, 2020 Crater of Diamonds State Park, Murfreesboro, Arkansas Yours, Paul H.- 1 reply
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Diamonds Found in Ureilites Formed During Gigantic Planetary Collisions
Oxytropidoceras posted a topic in Rocks & Minerals
Cosmic Diamonds Formed During Gigantic Planetary Collisions, Goethe University, Frankfurt, September 29, 2020 Nestola, F., Goodrich, C.A., Morana, M. Barbaro, A., Jakubek, R.S., Christ, O., Brenker, F.E., Domeneghetti, M.C., Dalconi, M.C., Alvaro, M., Fioretti, A.M., Litasov, K.D., Fries, M.D., Leoni, M., Casati, N.P.M., Jenniskens, P., and Shaddad, M.H., 2020. Impact shock origin of diamonds in ureilite meteorites. PNSA, Sept 19, 2020. Yours, Paul H.-
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A worthwhile podcast about the cultural aspects of diamonds. Diamonds: Articles of Interest #11 - 99% Invisible Podcast https://99percentinvisible.org/episode/diamonds-articles-of-interest-11/ Campbell, J.A., 2019. Financing diamond projects. Journal of the Southern African Institute of Mining and Metallurgy, 119(2), pp.139-147. http://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S2225-62532019000200008 http://www.scielo.org.za/pdf/jsaimm/v119n2/08.pdf Yours, Paul h.
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Origin of British Crown Jewels’ diamond revealed Valentina Ruiz Leotaud, MiningCom, June 28, 2020 https://www.mining.com/origin-of-british-crown-jewels-diamond-revealed/ CLIPPIR diamonds = Cullinan–like, large, inclusion–poor, pure, irregular, and resorbed diamonds Smith, E.M., Shirey, S.B., Nestola, F., Bullock, E.S., Wang, J., Richardson, S.H. and Wang, W., 2016. Large gem diamonds from metallic liquid in Earth’s deep mantle. Science, 354(6318), pp.1403-1405. https://www.researchgate.net/publication/311666698_Large_gem_diamonds_from_metallic_liquid_in_Earth's_deep_mantle https://www.researchgate.net/figure/Examples-of-rough-CLIPPIR-diamonds-from-the-Letseng-mine-Lesotho-GIA-copyright-credit_fig2_311666698 Yours, Paul H.
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Diamonds reveal how continents are stabilized, key to Earth's habitability by Carnegie Institution for Science, PhysOrg, April 25, 2019 https://phys.org/news/2019-04-diamonds-reveal-continents-stabilized-key.html https://www.livescience.com/65327-diamond-flaws-reveal-early-geology.html The paper is: Karen V. Smit, Steven B. Shirey, Erik H. Hauri, and Richard A. Stern 2019, Sulfur isotopes in diamonds reveal differences in continent construction. Science 26 Apr 2019: Vol. 364, Issue 6438, pp. 383-385 DOI: 10.1126/science.aaw9548 https://science.sciencemag.org/content/364/6438/383 Also, there is: Lithospheric Diamonds / Continental Mantle https://sites.google.com/carnegiescience.edu/stevenbshirey/publications/lithospheric-diamondcontinental-mantle https://sites.google.com/carnegiescience.edu/stevenbshirey/home Yours, Paul H.
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A few weeks ago a member tried to estimate the number of ammonite fossils in the Earth. Here is a similiar calculation for diamonds: a quadrillion tons. I wonder if DeBeers has read this? https://www.cnn.com/2018/07/17/world/diamonds-under-earth-surface-trnd/index.html
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Diamonds from Meteorite Might Have Formed Inside a Long-lost Planet (Open Access with Reviewer's Comments)
Oxytropidoceras posted a topic in Geology
These diamonds from space formed inside a long-lost planet, scientists say. By Sarah Kaplan, Washington Post, April 17, 2018 https://www.washingtonpost.com/news/speaking-of-science/wp/2018/04/17/these-space-diamonds-come-from-a-long-lost-planet-scientists-say/ The open access paper is: Farhang Nabiei, James Badro, Teresa Dennenwaldt, Emad Oveisi, Marco Cantoni, Cécile Hébert, Ahmed El Goresy, Jean-Alix Barrat, and Philippe Gillet, 2018, A large planetary body inferred from diamond inclusions in a ureilite meteorite Nature Communications volume 9, Article number: 1327 (2018) doi:10.1038/s41467-018-03808-6 https://www.nature.com/articles/s41467-018-03808-6 Supplementary Information at: https://www.nature.com/articles/s41467-018-03808-6#Sec16 https://static-content.springer.com/esm/art%3A10.1038%2Fs41467-018-03808-6/MediaObjects/41467_2018_3808_MOESM1_ESM.pdf The reviewer's comments from peer-review are included. It is chance to see how scientists conduct peer-review. Reviewers comments at: https://static-content.springer.com/esm/art%3A10.1038%2Fs41467-018-03808-6/MediaObjects/41467_2018_3808_MOESM2_ESM.pdf Yours, Paul H. -
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Diamonds May Not Be So Rare As Once Thought (open access PDF)
Oxytropidoceras posted a topic in Rocks & Minerals
Diamonds May Not Be So Rare As Once Thought Johns Hopkins Scientists’ Chemical Model Shows a Simpler Deep Earth Formation, Joh Hopkins http://releases.jhu.edu/2015/11/03/diamonds-may-not-be-so-rare-as-once-thought/ https://www.sciencedaily.com/releases/2015/11/151103140444.htm Dimitri A. Sverjensky and Fang Huang, 2015, Diamond formation due to a pH drop during fluid–rock interactions Nature Communications 6, Article number: 8702 (2015) doi:10.1038/ncomms9702 https://www.nature.com/articles/ncomms9702 Yours, Paul H.-
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Big Diamonds Bring Scientists A Message From Superdeep Earth
Oxytropidoceras posted a topic in Geology
Big Diamonds Bring Scientists A Message From Superdeep Earth NPR, http://www.npr.org/sections/thetwo-way/2016/12/15/505386423/big-diamonds-bring-scientists-a-message-from-superdeep-earth Large, rare diamonds offer window into inner workings of Earth's mantle https://carnegiescience.edu/news/biggest-and-best-diamonds-formed-deep-mantle-metallic-liquid https://www.eurekalert.org/pub_releases/2016-12/gioa-lrd120716.php http://phys.org/news/2016-12-biggest-diamonds-deep-mantle-metallic.html http://www.livescience.com/57222-biggest-diamonds-form-in-liquid-metal-pools.html Diamonds: Huge, rare precious stones form 750km underground in Earth's mantle, International Business Times UK http://www.ibtimes.co.uk/huge-rare-diamonds-are-born-pools-liquid-metal-deep-below-earths-surface-1596725 the paper is: Smith, E. M., S. B. Shirey, F. Nestola, and others, 2016, Large gem diamonds from metallic liquid in Earth’s deep mantle. Science. Vol. 354, Issue 6318, pp. 1403-1405. DOI: 10.1126/science.aal1303 http://science.sciencemag.org/content/354/6318/1403 Yours, Paul H. -
This is a short story that is evidence that an amateur fossil collector can make an important DISCOVERY. Laramie, Wyoming- University of Wyoming- circa 1974-1975 (I just did not want to Google this short story to make it a monograph.) This was when I was a student at UW. A student of Dr. Don Boyd who taught classes concerning Invertebrate Fossils to Freshman and Sophomore Geology majors... also was like all of us... a curious fossil collector. Dr. Boyd also taught Historical Geology / Stratigraphy as it is also as important as the fossils within a formation as well. Wyoming students were being "groomed" to be Petroleum Geologists. You know... the ones in the small trailer next to a 105 foot deep well Drilling Rig being awakened at all hours of the night and busy all day while drilling. When the "mud and drilling fluids" are being circulated, this fluid mix brings up parts and pieces of the formation that has been drilled into. When the drilling is getting closer to the objective... the Petroleum Engineer is taken from his "high tea and five course meals" at a local hotel to come to the drilling site. I had inspected drilling rigs in Wyoming in July... and in January. I understand why the drilling crew is paid well. This is not something for the weak and prone to tripping over drill pipe or chains. So now you understand the glamorous field career of a "soft rock Geologist". The geology department had been making thin sections. Maybe for the Optical Mineralogy class... maybe for some Master Degree paper... I forget. But the lap wheels to thin the rock thin sections, thin enough to put under a polarized microscope... was having the wheel damaged with scratches. The first thing a Professor will do is find the "dip $**t" who was costing the department money. Normal operating procedure. This did not happen once, but too frequently. These samples were being recovered from a location just south of the Colorado / Wyoming State Line. Just south of Laramie... near Virginia Dale, Colorado. Why were these samples being... studied? Well, that is where our under grad student of geology made an important discovery... sitting down for a sack lunch break. Our mystery student, who can most likely be found in a Wyoming Geological Survey newsletter, while eating lunch "scouting" out weathered granite noticed something... odd. Something that was not suppose to be there. A brachiopod. This was an Ordovician brachiopod. Common as sand in Indiana, Ohio and much of this area. But this area of Colorado and Wyoming had... no... Ordovician rock formations. It was assumed that the Ordovician oceans never made it to this area. Or, was completely eroded away and lost to all. Dr. Boyd recognized the brachiopod and knew it was... Ordovician. This created some excitement. The WHY, HOW and WHERE is it kind of excitement... especially to an unknown now becoming known.