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New Investigation of a Greenland ice core platinum anomaly near the Bølling-Allerød/Younger Dryas boundary
Oxytropidoceras posted a topic in Fossil News
Green, C. E., 2019. Investigating the origin of a Greenland ice core geochemical anomaly near the Bølling-Allerød/Younger Dryas boundary (Doctoral dissertation, Durham University). http://etheses.dur.ac.uk/13490/ http://etheses.dur.ac.uk/13490/1/C_Green_thesis_final_CORRECTIONS.pdf Green (2019) noted: "The source of a platinum peak identified in the Greenland Ice Sheet Project 2 (GISP2) ice core associated with high platinum/iridium (Pt/Ir) and platinum/aluminium (Pt/Al) ratios, and previous research attributed the anomaly to an unusual iron-rich Ir-poor meteorite impact." Green (2019) concluded: I. the Laacher See eruption is not the Pt spike source because: A. the Laacher See tephra has low Pt concentrations, B. the Laacher See tephra’s geochemical ratios are dissimilar to the GISP2 Pt spike and C. conversion of the Pt spike timing to the newest ice core age-depth model shows a chronological offset of ~60 years between the two events. II. The event resulting in the Pt spike occurred ~60 years after GS-1 cooling, and was therefore not the primary trigger. III. and the Pt spike origin is interpreted as either: A. a noncataclysmic impact of an undiscovered iron meteorite B. or an unidentified Pt-rich volcanic eruption contemporaneous with the anomaly, whose aerosol fractionated in the atmosphere or ice. Yours, Paul H.-
- bølling-allerød
- extraterrestrial impact
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Ancient viruses found in Tibetan glacier https://www.vice.com/en_us/article/pkebx9/scientists-found-ancient-never-before-seen-viruses-in-a-glacier?utm_source=digg&utm_medium=email https://www.sciencemag.org/news/2020/01/ancient-viruses-found-tibetan-glacier https://www.livescience.com/unknown-viruses-discovered-tibetan-glacier.html Another article is: Giant Virus Resurrected from Permafrost After 30,000 Years By Tia Ghose March 03, 2014 https://www.livescience.com/43800-giant-virus-found-permafrost.html The unreviewed paper is: Zhi-Ping Zhong, Natalie E. Solonenko, Yueh-Fen Li, Maria C. Gazitúa, Simon Roux, Mary E. Davis, James L. Van Etten, Ellen Mosley-Thompson, Virginia I. Rich, Matthew B. Sullivan, Lonnie G. Thompson, ip, Glacier ice archives fifteen-thousand-year-old viruses doi: https://doi.org/10.1101/2020.01.03.894675 https://www.biorxiv.org/content/10.1101/2020.01.03.894675v1.full Defrosting Ancient Microbes by Scott Rogers and John D. Castello https://www.goodreads.com/book/show/50199089-defrosting-ancient-microbes Yours, Paul H.
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2.7-Million-Year-Old Ice from Allan Hills Blue Ice Areas, East Antarctica
Oxytropidoceras posted a topic in Geology
Yan Y, Ng J, Higgins J, Kurbatov A, Clifford H, Spaulding N, Severinghaus J, Brook E, Mayewski P & Bender M., Paris 2017, August 13-18 2.7-Million-Year-Old Ice from Allan Hills Blue Ice Areas, East Antarctica Reveals Climate Snapshots Since Early Pleistocene Goldschmidt 2017, Conference, https://goldschmidt.info/2017/abstracts/abstractView?id=2017004920 Record-shattering 2.7-million-year-old ice core reveals start of the ice ages By Paul Voosen, Science Magazine, Aug. 15, 2017 http://www.sciencemag.org/news/2017/08/record-shattering-27-million-year-old-ice-core-reveals-start-ice-ages Forscher bergen 2,7 Millionen Jahre altes Eis aus der Antarktis, 19. August 2017 http://derstandard.at/2000062778176/Forscher-bergen-2-7-Millionen-Jahre-altes-Eis-aus-der Yours, Paul H-
- allan hillls
- antarctica
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