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Showing results for tags 'extraterrestrial impact'.
Found 8 results
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A steeply-inclined trajectory for the Chicxulub impact
Oxytropidoceras posted a topic in Fossil News
Dinosaur-dooming asteroid struck Earth at 'deadliest possible' angle Imperial College London, May 26, 2020 https://www.sciencedaily.com/releases/2020/05/200526111320.htm Collins, G.S., Patel, N., Davison, T.M. et al. A steeply- inclined trajectory for the Chicxulub impact. Nat Commun 11, 1480 (2020). https://www.nature.com/articles/s41467-020-15269-x Another paper: Rae, A.S., Collins, G.S., Poelchau, M., Riller, U., Davison, T.M., Grieve, R.A., Osinski, G.R., Morgan, J.V. and Expedition, I.I., 2019. Stress‐Strain Evolution During Peak‐Ring Formation: A Case Study of the Chicxulub Impact Structure. Journal of Geophysical Research: Planets, 124(2), pp.396-417. https://eprints.gla.ac.uk/192907/1/192907.pdf https://hal.umontpellier.fr/hal-02128150/document Yours, Paul H.-
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- chicxulub
- extraterrestrial impact
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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. -
Asteroids, Micro Diamonds, and the Younger Dryas with Jens Notroff: Archaeological Fantasies Ep 106 Archaeological Fantasies Podcast https://player.fm/series/archaeological-fantasies-podcast/asteroids-micro-diamonds-and-the-younger-dryas-with-jens-notroff-archaeological-fantasies-ep-106 https://player.fm/series/archaeological-fantasies-podcast The Deus ex machina for the destruction of civilizations, either imaginary or real, seems to be comet impacts. Remix – Atlantis in Sardinia with Dr. Emily Holt Archaeological Fantasies ep 107 https://player.fm/series/archaeological-fantasies-podcast/remix-atlantis-in-sardinia-with-dr-emily-holt-archaeological-fantasies-ep-107 https://player.fm/series/archaeological-fantasies-podcast Yours, Paul H.
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ABSTRACT,but with pix ocampvajd48th_LPSC_Americabstra2466_Gomez2017_N2_impacrater_astroblpliocenozoicdiscovered_ysical_seismic_evidences_C.pdf 1,5 Mb Age: probably Pliocene
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The "Great Expectations Syndrome" and Mass Extinctions
Oxytropidoceras posted a topic in Fossil News
Below is an interesting paper about mass extinctions. Racki, G. 2012. The Alvarez impact theory of mass extinction; limits to its applicability and the "great expectations syndrome". Acta Palaeontologica Polonica 57 (4): 681-702. https://www.app.pan.pl/archive/published/app57/app20110058.pdf https://www.app.pan.pl/article/item/app20110058.html https://www.researchgate.net/publication/239739714_The_Alvarez_impact_theory_of_mass_extinction_limits_to_its_applicability_and_the_great_expectations_syndrome https://www.researchgate.net/profile/Grzegorz_Racki http://agro.icm.edu.pl/agro/element/bwmeta1.element.agro-d1182c96-9ae1-48af-858c-a2f844a3d830/c/app20110058_681.pdf Other papers are: Racki, G., 2015. Catastrophism and neocatastrophism versus cosmic hazard: Ager versus Alvarez; Cuvier versus Laplace. Palaios, 30(6), pp. 432-434. http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.894.7456&rep=rep1&type=pdf https://www.researchgate.net/publication/279238673_Catastrophism_and_neocatastrophism_versus_cosmic_hazard_Ager_versus_Alvarez_Cuvier_versus_Laplace Racki, G., 2014. Dmitri Sobolev and other forgotten forerunners of mass extinction science and volcanic catastrophism. Acta Palaeontologica Polonica, 59(4), pp. 1006-1008. http://yadda.icm.edu.pl/yadda/element/bwmeta1.element.agro-c20648d9-6f1c-454b-b6ce-c2fd0eb7a061/c/app20141004_1006_1008.pdf https://www.infona.pl/resource/bwmeta1.element.agro-c20648d9-6f1c-454b-b6ce-c2fd0eb7a061 Yours, Paul H. -
60-Million-Year-Old Meteorite Impact Ejecta Discovered on Scotland’s Isle of Skye
Oxytropidoceras posted a topic in Fossil News
Alien Minerals Discovered at Ancient Meteorite Strike Site in Scotland by Katherine Hignett, Newsweek, Dec. 15, 2017 http://www.newsweek.com/skye-meteorites-alien-mineral-749103 60-Million-Year-Old Meteorite Impact Zone Discovered on Scotland’s Isle of Skye, Sci News, December 15, 2017 http://www.sci-news.com/geology/meteorite-impact-scotlands-isle-of-skye-05539.html “A team of geologists has found 60 million-year-old ejecta from a previously unknown meteorite impact on the Isle of Skye, northwest Scotland. This is the first recorded mid-Paleocene impact event in the region and is coincident with the onset of magmatism in the British Paleogene Igneous Province.” The open-access paper is: Drake, S.M., A.D. Beard, A.P. Jones, D.J. Brown, A.D. Fortes, I.L. Millar, A. Carter, J. Baca, and H. Downes, 2017, Discovery of a meteoritic ejecta layer containing unmelted impactor fragments at the base of Paleocene lavas, Isle of Skye, Scotland. Geology. DOI: https://doi.org/10.1130/G39452.1 https://pubs.geoscienceworld.org/gsa/geology/article/525169/discovery-of-a-meteoritic-ejecta-layer-containing Yours, Paul- 1 reply
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- paleogene igneous province
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Comet Strike May Have Triggered the Paleocene-Eocene Thermal Maximum (PETM)
Oxytropidoceras posted a topic in Fossil News
Extraterrestrial Impact Preceded Ancient Global Warming Event By Mary L. Martialay, Rensselaer Polytechnic Institute, October 13, 2016 http://news.rpi.edu/content/2016/10/13/extraterrestrial-impact-preceded-ancient-global-warming-event Ancient Meteorite Impact Rained Debris On US East Coast By Calla Cofield, Space.com, October 13, 2016 http://www.space.com/34384-ancient-meteorite-impact-hit-us-east-coast.html Yours, Paul H. -
Impact Origin of Paleocene-Eocene Thermal Maximum (PETM) ?
Oxytropidoceras posted a topic in Fossil News
Glass bits, charcoal hint at 56-million-year-old space rock Impact. Timing coincides with period of rapid warming perhaps sparked by comet, Thomas Summer, Science News. https://www.sciencenews.org/article/glass-bits-charcoal-hint-56-million-year-old-space-rock-impact Schaller, M.F., and others, 2016, Distal impact ejecta at Paleocene-Eocene boundary sections on the Atlantic Margin. Geological Society of America annual meeting, Denver, September 27, 2016. Geological Society of America Abstracts with Programs. Vol. 48, No. 7. https://gsa.confex.com/gsa/2016AM/webprogram/Paper286189.html https://gsa.confex.com/gsa/2016AM/webprogram/Session40161.html Fung, M.K., and others, 2016, Widespread wildfires at the Paleocene Eocene boundary: Evidence from abundant charcoal preserved in the thick Marlboro Clay. Geological Society of America annual meeting, Denver, September 27, 2016. Geological Society of America Abstracts with Programs. Vol. 48, No. 7 https://gsa.confex.com/gsa/2016AM/webprogram/Paper284983.html https://gsa.confex.com/gsa/2016AM/webprogram/Session40161.html More papers at: https://gsa.confex.com/gsa/2016AM/webprogram/Session40161.html Yours, Paul H.
