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Showing results for tags 'asteroid impact'.
Found 12 results
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Subfossil confier remains modified by asteroid impact, Hiawatha Glacier, Greenland
Oxytropidoceras posted a topic in Fossil News
Garde, A.A., Søndergaard, A.S., Guvad, C., Dahl-Møller, J., Nehrke, G., Sanei, H., Weikusat, C., Funder, S., Kjær, K.H. and Larsen, N.K., 2020. Pleistocene organic matter modified by the Hiawatha impact, northwest Greenland. Geology, 48(9), pp.867-871. open access paper Supplemental Material: Pleistocene organic matter modified by the Hiawatha impact, northwest Greenland Yours, Paul H. -
K-Pg Impact Spurred the Evolution of the Modern Rainforest
Oxytropidoceras posted a topic in Fossil News
How the Dinosaur-Killing Asteroid Spurred the Evolution of the Modern Rainforest New evidence from fossil plants shows today’s South American rainforests arose in the wake of Earth’s fifth mass extinction. Smithsonian Magazine Prior to the Chicxulub impact, rainforests looked very different Plant fossils from Colombia show a turnover from conifers to today's forests. by Doug Johnson, Ars Technica, April 1, 2021 Paper Carvalho, M.R., Jaramillo, C., de la Parra, F. et al. 2021. Extinction at the end-Cretaceous and the origin of modern Neotropical rainforests. Science. Vol. 372, Issue 6537, pp. 63-68 Related papers Wing, S.L., Herrera, F., Jaramillo, C.A., Gómez-Navarro, C., Wilf, P. and Labandeira, C.C., 2009. Late Paleocene fossils from the Cerrejón Formation, Colombia, are the earliest record of Neotropical rainforest. Proceedings of the National Academy of Sciences, 106(44), pp.18627-18632. Graham, H.V., Herrera, F., Jaramillo, C., Wing, S.L. and Freeman, K.H., 2019. Canopy structure in Late Cretaceous and Paleocene forests as reconstructed from carbon isotope analyses of fossil leaves. Geology, 47(10), pp.977-981. Yours, Paul H.- 1 reply
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A meteorite exploded in the air above Antarctica 430,000 years ago By Katie Hunt, CNN, March 31, 2021 Major Meteoritic Event Occurred over Antarctica 430,000 Years Ago Researchers have found meteoritic spherules on top of Walnumfjellet in the Sør Rondane Mountains, Antarctica. News Staff, Sci News, April 1, 2021 Fiery 'airburst' of superheated gas slammed into Antarctica 430,000 years ago. Nicoletta Lanese, Live Science, March 31, 2021 The paper is: Van Ginneken, M., Goderis, S., Artemieva, n., et al., 2021, A large meteoritic event over Antarctica ca. 430 ka ago inferred from chondritic spherules from the Sør Rondane Mountains. Science Advances. Vol. 7, no. 14, eabc1008, DOI: 10.1126/sciadv.abc1008 Yours, Paul H.
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- air burst
- antarctic ice sheet
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Controversy over impact origin of Maniitsoq structure (West Greeland) continues
Oxytropidoceras posted a topic in Geology
World's oldest meteor crater isn't what it seems By Harry Baker, Live Science, March 24, 2021 New controversial claim suggests it's not a meteor crater at all. Science Tech Daily, March 26, 2021 The paper is: Yakymchuk, C., Kirkland, C.L., Cavosie, A.J., Szilas, K., Hollis, J., Gardiner, N.J., Waterton, P., Steenfelt, A. and Martin, L., 2021. Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland. Earth and Planetary Science Letters, 557, no. 116730. PDF file of above paper on Researchgate Yours, Paul H. -
Explosive interaction of impact melt and seawater following the Chicxulub impact event
Oxytropidoceras posted a topic in Fossil News
Osinski, G.R., Grieve, R.A., Hill, P.J., Simpson, S.L., Cockell, C., Christeson, G.L., Ebert, M., Gulick, S., Melosh, H.J., Riller, U. and Tikoo, S.M., 2020. Explosive interaction of impact melt and seawater following the Chicxulub impact event. Geology, 48(2), pp.108-112. https://www.researchgate.net/publication/337464107_Explosive_interaction_of_impact_melt_and_seawater_following_the_Chicxulub_impact_event https://www.researchgate.net/profile/Richard_Grieve/research Gulick, S.P., Bralower, T.J., Ormö, J., Hall, B., Grice, K., Schaefer, B., Lyons, S., Freeman, K.H., Morgan, J.V., Artemieva, N. and Kaskes, P., 2019. The first day of the Cenozoic. Proceedings of the National Academy of Sciences, 116(39), pp.19342-19351. https://www.researchgate.net/publication/335722192_The_first_day_of_the_Cenozoic https://www.pnas.org/content/pnas/116/39/19342.full.pdf Yours, Paul H.-
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- asteroid impact
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Chicxulub impact created massive melt sheet and hydrothermal system
Oxytropidoceras posted a topic in Fossil News
Dino-Killing Asteroid Spawned a Huge Magma Chamber That Lasted Millions of Years by George Dvorsky, Gizmodo, May 29, 2020 https://gizmodo.com/dino-killing-asteroid-spawned-a-huge-magma-chamber-that-1843752492 The open access paper is; D. A. Kring, M. Tikoo, Schmieder, Ulrich Riller, and many others. 2020. Probing the hydrothermal system of the Chicxulub impact crater. Science Advances 29 May 2020: Vol. 6, no. 22, eaaz3053 DOI: 10.1126/sciadv.aaz3053 https://advances.sciencemag.org/content/6/22/eaaz3053 Yours, Paul H-
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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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Yale University. "In death of dinosaurs, it was all about the asteroid -- not volcanoes." ScienceDaily. ScienceDaily, 16 January 2020. https://www.sciencedaily.com/releases/2020/01/200116141708.htm Meteorite or Volcano? New Clues to the Dinosaurs’ Demise Twin calamities marked the end of the Cretaceous period, and scientists are presenting new evidence of which drove one of Earth’s great extinctions. New York Times, January 16, 2020 https://www.nytimes.com/2020/01/16/science/dinosaurs-extinction-meteorite-volcano.html The paper is: Hull, P.M., Bornemann, A., Penman, D.E., Henehan, M.J., Norris, R.D., Wilson, P.A., Blum, P., Alegret, L., Batenburg, S.J., Bown, P.R. and Bralower, T.J., 2020. On impact and volcanism across the Cretaceous- Paleogene boundary. Science, 367(6475), pp.266-272. https://science.sciencemag.org/content/367/6475/266.abstract Yours, Paul H.
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Reidite implies asteroid impact created Libyan Desert Glass
Oxytropidoceras posted a topic in Rocks & Minerals
Mystery of Libyan desert glass solved at last. Famous since the time of King Tut the origin of the scattered glass fragments has long puzzled researchers. Aaron Cavosie from Australia’s Curtin University explains. https://cosmosmagazine.com/archaeology/mystery-of-libyan-desert-glass-solved-at-last Planetary scientists unravel mystery of Egyptian desert glass by Curtin University, PyhsOrg https://phys.org/news/2019-05-planetary-scientists-unravel-mystery-egyptian.html https://www.sciencealert.com/exotic-glass-in-egypt-was-created-by-a-meteorite-impact-millions-of-years-ago 100-Year Mystery Solved, Yellow Glass In Egyptian Desert Caused By Meteorite Strike, Athena Chan, Tech Times https://www.techtimes.com/articles/243406/20190518/100-year-mystery-solved-yellow-glass-in-egyptian-desert-caused-by-meteorite-strike.htm The paper is: Cavosie, A.J. and Koeberl, C., 2019. Overestimation of threat from 100 Mt–class airbursts? High-pressure evidence from zircon in Libyan Desert Glass. Geology. DOI: 10.1130/G45974.1 https://pubs.geoscienceworld.org/gsa/geology/article/570318/Overestimation-of-threat-from-100-Mtclass yours, Paul H.- 2 replies
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Earth's oldest rock was found by Apollo 14 astronauts -- on the moon. Ashley Strickland, CNN, January 24, 2019 https://www.cnn.com/2019/01/24/world/earth-oldest-rock-moon/index.html We May Have Found Earth's Oldest Known Rock. It Was on The Moon. Michelle Starr, January 25, 2019 https://www.sciencealert.com/earth-s-oldest-rock-may-have-been-found-it-was-um-on-the-moon The paper is: J.J. Bellucci, A.A. Nemchin, M. Grange, K.L. Robinson, G. Collinse, M.J. Whitehouse, J.F. Snape, M.D.Norman D.A.Krin Terrestrial-like zircon in a clast from an Apollo 14 breccia Earth and Planetary Science Letters. Volume 510, Pages 173-185 https://www.sciencedirect.com/science/article/pii/S0012821X19300202 Yours, Paul H.
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The only venomous mammal that survived dinosaurs extinction - endangered now
Kasia posted a topic in Fossil News
http://www.iflscience.com/plants-and-animals/this-weird-venomous-mammal-survived-the-asteroid-impact-that-wiped-out-the-dinosaurs/- 2 replies
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Sources of Tsunamis From Krakatoa to Monterey Bay
Oxytropidoceras posted a topic in Rocks & Minerals
Below is a very interesting talk about tsunamis and how they are created. One quite interesting point that came up during the lecture and questions is that asteroid and meteorite impact are quite ineffective at creating tsunamis and the tsunamis threat from them has been greatly overestimated and the impact tsunamis shown in popular films is quite overexaggerated. Unusual Sources of Tsunamis From Krakatoa to Monterey Bay USGS 2017 January Evening Public Lecture, Eric Geist by Eric Geist, USGS Research Geophysicist https://www.youtube.com/watch?v=lSHBvb_QHrU Other very interesting USGS talks include: The Giant Cascadia Earthquake of January 26, 1700 July Evening Public Lecture 2015 Justin Rubinstein, USGS Research Geophysicist https://www.youtube.com/watch?v=AiojgMBQPBM Underwater Secrets of the Hayward Fault Zone: Integrated 3D imaging to understand earthquake hazards USGS 2017 May Evening Public Lecture https://www.youtube.com/watch?v=QaQVGOg6YMM The Cascadia talk discusses how subfossil trees were used to date the age of the last Cascadia Earthquake and tsunami. Yours, Paul H.
