Impact fingerprints of the 4 kyr BP dust event based on archaeological, soil, lake and marine archives
The 4 kyr BP impact event has been identified from deep-sea, soil and archaeological records as the worldwide pulverisation of a volatile-rich debris jet(1). High resolution sequences show two stages of ejecta fallout linked to the impact-triggered doublet gaseous regime(2): scattered solid debris a...
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ftawi:oai:epic.awi.de:16964 2024-09-15T17:44:38+00:00 Impact fingerprints of the 4 kyr BP dust event based on archaeological, soil, lake and marine archives Courty, M. A. Cortese, Giuseppe Crisci, A. Crosta, X. De Wever, P. Fedoroff, M. Guichard, F. Mermoux, M. Smith, D. Thiemens, M. H. 2007 application/pdf https://epic.awi.de/id/eprint/16964/ https://epic.awi.de/id/eprint/16964/1/Cou2007a.pdf https://hdl.handle.net/10013/epic.26811 https://hdl.handle.net/10013/epic.26811.d001 unknown https://epic.awi.de/id/eprint/16964/1/Cou2007a.pdf https://hdl.handle.net/10013/epic.26811.d001 Courty, M. A. , Cortese, G. , Crisci, A. , Crosta, X. , De Wever, P. , Fedoroff, M. , Guichard, F. , Mermoux, M. , Smith, D. and Thiemens, M. H. (2007) Impact fingerprints of the 4 kyr BP dust event based on archaeological, soil, lake and marine archives , Geophysical Research Abstracts, European Geosciences Union (EGU) General Assembly 2007, April 15th-20th, Wien (Austria), ISSN: . hdl:10013/epic.26811 EPIC3Geophysical Research Abstracts, European Geosciences Union (EGU) General Assembly 2007, April 15th-20th, Wien (Austria), ISSN:, pp. 1029-7006 Conference notRev 2007 ftawi 2024-06-24T03:59:51Z The 4 kyr BP impact event has been identified from deep-sea, soil and archaeological records as the worldwide pulverisation of a volatile-rich debris jet(1). High resolution sequences show two stages of ejecta fallout linked to the impact-triggered doublet gaseous regime(2): scattered solid debris at the ground surface and spray of the vaporized hot fireball with thermal blast and local ignition. Ejecta debris consist of flow-textured impact glass, impact breccia and incompletely melted marine clasts: volcano-clastic sandy mudstone, calcareous mud, granite-gneiss, schists, volcanic breccia, kerogen and algal mud. Marine microfossils, organo-mineral markers, and the debris-fallout spatial pattern indicate two potential impact craters: an Antarctic source with an admixture of volcanic glass and ice rafted debris, from the vicinity of Heard Island and the Kerguelen plateau; a low latitude, shallow water one with hydrocarbons possibly from the Gulf of Mexico. Fine mixing of target materials from far distant source craters emphasizes a unique impact-ejecta. This matches the theoretical view of a debris jet channelled along the corridor cut through the atmosphere by the incoming projectile, raised upward, and dispersed widely(3). The isotopic anomaly of the sulphur phase in the kerogen volatile-component, indicating mass independent fractionation due to photolytic transformation, suggests launching at great heights, beyond the O2-O3 UV shield, responsible for climate disturbances. The incomplete melting of target rocks and global dispersion of impact breccia out of the craters would result from splash of small-sized projectile at rather great water depth and a low angle impact (10-15 degrees) into porous, highly compressible marine sediments. The spatially variable distribution of the organo-mineral and melt components, and the wide range of phase transformation reflect non-equilibrium shock-melting and micro-scale thermal processes in the heterogeneous vapor plume ejected from the impact sites. The 4 kyr BP event ... Conference Object Antarc* Antarctic Heard Island Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
The 4 kyr BP impact event has been identified from deep-sea, soil and archaeological records as the worldwide pulverisation of a volatile-rich debris jet(1). High resolution sequences show two stages of ejecta fallout linked to the impact-triggered doublet gaseous regime(2): scattered solid debris at the ground surface and spray of the vaporized hot fireball with thermal blast and local ignition. Ejecta debris consist of flow-textured impact glass, impact breccia and incompletely melted marine clasts: volcano-clastic sandy mudstone, calcareous mud, granite-gneiss, schists, volcanic breccia, kerogen and algal mud. Marine microfossils, organo-mineral markers, and the debris-fallout spatial pattern indicate two potential impact craters: an Antarctic source with an admixture of volcanic glass and ice rafted debris, from the vicinity of Heard Island and the Kerguelen plateau; a low latitude, shallow water one with hydrocarbons possibly from the Gulf of Mexico. Fine mixing of target materials from far distant source craters emphasizes a unique impact-ejecta. This matches the theoretical view of a debris jet channelled along the corridor cut through the atmosphere by the incoming projectile, raised upward, and dispersed widely(3). The isotopic anomaly of the sulphur phase in the kerogen volatile-component, indicating mass independent fractionation due to photolytic transformation, suggests launching at great heights, beyond the O2-O3 UV shield, responsible for climate disturbances. The incomplete melting of target rocks and global dispersion of impact breccia out of the craters would result from splash of small-sized projectile at rather great water depth and a low angle impact (10-15 degrees) into porous, highly compressible marine sediments. The spatially variable distribution of the organo-mineral and melt components, and the wide range of phase transformation reflect non-equilibrium shock-melting and micro-scale thermal processes in the heterogeneous vapor plume ejected from the impact sites. The 4 kyr BP event ... |
format |
Conference Object |
author |
Courty, M. A. Cortese, Giuseppe Crisci, A. Crosta, X. De Wever, P. Fedoroff, M. Guichard, F. Mermoux, M. Smith, D. Thiemens, M. H. |
spellingShingle |
Courty, M. A. Cortese, Giuseppe Crisci, A. Crosta, X. De Wever, P. Fedoroff, M. Guichard, F. Mermoux, M. Smith, D. Thiemens, M. H. Impact fingerprints of the 4 kyr BP dust event based on archaeological, soil, lake and marine archives |
author_facet |
Courty, M. A. Cortese, Giuseppe Crisci, A. Crosta, X. De Wever, P. Fedoroff, M. Guichard, F. Mermoux, M. Smith, D. Thiemens, M. H. |
author_sort |
Courty, M. A. |
title |
Impact fingerprints of the 4 kyr BP dust event based on archaeological, soil, lake and marine archives |
title_short |
Impact fingerprints of the 4 kyr BP dust event based on archaeological, soil, lake and marine archives |
title_full |
Impact fingerprints of the 4 kyr BP dust event based on archaeological, soil, lake and marine archives |
title_fullStr |
Impact fingerprints of the 4 kyr BP dust event based on archaeological, soil, lake and marine archives |
title_full_unstemmed |
Impact fingerprints of the 4 kyr BP dust event based on archaeological, soil, lake and marine archives |
title_sort |
impact fingerprints of the 4 kyr bp dust event based on archaeological, soil, lake and marine archives |
publishDate |
2007 |
url |
https://epic.awi.de/id/eprint/16964/ https://epic.awi.de/id/eprint/16964/1/Cou2007a.pdf https://hdl.handle.net/10013/epic.26811 https://hdl.handle.net/10013/epic.26811.d001 |
genre |
Antarc* Antarctic Heard Island |
genre_facet |
Antarc* Antarctic Heard Island |
op_source |
EPIC3Geophysical Research Abstracts, European Geosciences Union (EGU) General Assembly 2007, April 15th-20th, Wien (Austria), ISSN:, pp. 1029-7006 |
op_relation |
https://epic.awi.de/id/eprint/16964/1/Cou2007a.pdf https://hdl.handle.net/10013/epic.26811.d001 Courty, M. A. , Cortese, G. , Crisci, A. , Crosta, X. , De Wever, P. , Fedoroff, M. , Guichard, F. , Mermoux, M. , Smith, D. and Thiemens, M. H. (2007) Impact fingerprints of the 4 kyr BP dust event based on archaeological, soil, lake and marine archives , Geophysical Research Abstracts, European Geosciences Union (EGU) General Assembly 2007, April 15th-20th, Wien (Austria), ISSN: . hdl:10013/epic.26811 |
_version_ |
1810492286591565824 |