Absence of Extraterrestrial 3He in Permian–Triassic Age Sedimentary Rocks
Helium concentration and isotopic composition were measured in a suite of samples across the Permian–Triassic boundary at Opal Creek, Canada, to determine whether high extraterrestrial helium concentrations are associated with a possible extinction-inducing impact event at this time. No extraterrest...
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Language: | English |
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ftharvardudash:oai:dash.harvard.edu:1/4725619 2023-05-15T13:57:56+02:00 Absence of Extraterrestrial 3He in Permian–Triassic Age Sedimentary Rocks Farley, K. A. Ward, P. Garrison, G. Mukhopadhyay, Sujoy 2005 application/pdf http://nrs.harvard.edu/urn-3:HUL.InstRepos:4725619 https://doi.org/10.1016/j.epsl.2005.09.054 en_US eng Elsevier Science BV doi:10.1016/j.epsl.2005.09.054 http://www.people.fas.harvard.edu/%7emukhop/PTB-He.pdf Earth and Planetary Science Letters Farley, K.A., P. Ward, G. Garrison, and S. Mukhopadhyay. 2005. Absence of extraterrestrial 3He in Permian-Triassic age sedimentary rocks. Earth and Planetary Science Letters 240(2): 265-275. 0012-821X http://nrs.harvard.edu/urn-3:HUL.InstRepos:4725619 fullerene Permian-Triassic boundary cosmic dust extraterrestrial helium Journal Article 2005 ftharvardudash https://doi.org/10.1016/j.epsl.2005.09.054 2022-04-04T12:42:09Z Helium concentration and isotopic composition were measured in a suite of samples across the Permian–Triassic boundary at Opal Creek, Canada, to determine whether high extraterrestrial helium concentrations are associated with a possible extinction-inducing impact event at this time. No extraterrestrial [super]3He was detected, implying that neither fullerene-hosted nor IDP-hosted He is present at or near the boundary. This observation is consistent with similar studies of some Permian–Triassic sections, but contrasts sharply with reports of both fullerene- and IDP-hosted extraterrestrial [super]3He at other sections. Step-heat experiments indicate rapid diffusion of extraterrestrial helium from sediments heated to temperatures above ~70 °C. Given the likelihood of burial and associated heating in Permian–Triassic age rocks, the initially unexpected absence of IDP-hosted [sup]3He likely indicates thermally induced diffusive loss. Indeed one of the key sections (Graphite Peak, Antarctica) from which extraterrestrial [super]3He has been reported at and near the Permian–Triassic boundary has been sufficiently heated that the reported preservation of extraterrestrial helium, in both IDPs and fullerenes, is inexplicable. Recent contamination provides a plausible explanation for extraterrestrial [super]3He in these samples. While no extraterrestrial [sup]3He was detected at Opal Creek, there is a sharp increase in nucleogenic [super]3He very close to or at the Permian–Triassic boundary. This presumably arises from the major lithologic change at this time, from cherts in the Permian to shales and siltstones in the Triassic. Increased nucleogenic [super]3He is associated with increases in both lithium and organic carbon content into the Triassic. Either the production rate or the retention of this [super]3He is higher in the shales and siltstones than in the cherts. Care must be taken to eliminate such artifacts before interpreting changes in [super]3He concentration in terms of fluctuations in the delivery of [super]3He from space. Earth and Planetary Sciences Version of Record Article in Journal/Newspaper Antarc* Antarctica Harvard University: DASH - Digital Access to Scholarship at Harvard Canada Graphite Peak ENVELOPE(172.750,172.750,-85.050,-85.050) Earth and Planetary Science Letters 240 2 265 275 |
institution |
Open Polar |
collection |
Harvard University: DASH - Digital Access to Scholarship at Harvard |
op_collection_id |
ftharvardudash |
language |
English |
topic |
fullerene Permian-Triassic boundary cosmic dust extraterrestrial helium |
spellingShingle |
fullerene Permian-Triassic boundary cosmic dust extraterrestrial helium Farley, K. A. Ward, P. Garrison, G. Mukhopadhyay, Sujoy Absence of Extraterrestrial 3He in Permian–Triassic Age Sedimentary Rocks |
topic_facet |
fullerene Permian-Triassic boundary cosmic dust extraterrestrial helium |
description |
Helium concentration and isotopic composition were measured in a suite of samples across the Permian–Triassic boundary at Opal Creek, Canada, to determine whether high extraterrestrial helium concentrations are associated with a possible extinction-inducing impact event at this time. No extraterrestrial [super]3He was detected, implying that neither fullerene-hosted nor IDP-hosted He is present at or near the boundary. This observation is consistent with similar studies of some Permian–Triassic sections, but contrasts sharply with reports of both fullerene- and IDP-hosted extraterrestrial [super]3He at other sections. Step-heat experiments indicate rapid diffusion of extraterrestrial helium from sediments heated to temperatures above ~70 °C. Given the likelihood of burial and associated heating in Permian–Triassic age rocks, the initially unexpected absence of IDP-hosted [sup]3He likely indicates thermally induced diffusive loss. Indeed one of the key sections (Graphite Peak, Antarctica) from which extraterrestrial [super]3He has been reported at and near the Permian–Triassic boundary has been sufficiently heated that the reported preservation of extraterrestrial helium, in both IDPs and fullerenes, is inexplicable. Recent contamination provides a plausible explanation for extraterrestrial [super]3He in these samples. While no extraterrestrial [sup]3He was detected at Opal Creek, there is a sharp increase in nucleogenic [super]3He very close to or at the Permian–Triassic boundary. This presumably arises from the major lithologic change at this time, from cherts in the Permian to shales and siltstones in the Triassic. Increased nucleogenic [super]3He is associated with increases in both lithium and organic carbon content into the Triassic. Either the production rate or the retention of this [super]3He is higher in the shales and siltstones than in the cherts. Care must be taken to eliminate such artifacts before interpreting changes in [super]3He concentration in terms of fluctuations in the delivery of [super]3He from space. Earth and Planetary Sciences Version of Record |
format |
Article in Journal/Newspaper |
author |
Farley, K. A. Ward, P. Garrison, G. Mukhopadhyay, Sujoy |
author_facet |
Farley, K. A. Ward, P. Garrison, G. Mukhopadhyay, Sujoy |
author_sort |
Farley, K. A. |
title |
Absence of Extraterrestrial 3He in Permian–Triassic Age Sedimentary Rocks |
title_short |
Absence of Extraterrestrial 3He in Permian–Triassic Age Sedimentary Rocks |
title_full |
Absence of Extraterrestrial 3He in Permian–Triassic Age Sedimentary Rocks |
title_fullStr |
Absence of Extraterrestrial 3He in Permian–Triassic Age Sedimentary Rocks |
title_full_unstemmed |
Absence of Extraterrestrial 3He in Permian–Triassic Age Sedimentary Rocks |
title_sort |
absence of extraterrestrial 3he in permian–triassic age sedimentary rocks |
publisher |
Elsevier Science BV |
publishDate |
2005 |
url |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:4725619 https://doi.org/10.1016/j.epsl.2005.09.054 |
long_lat |
ENVELOPE(172.750,172.750,-85.050,-85.050) |
geographic |
Canada Graphite Peak |
geographic_facet |
Canada Graphite Peak |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
doi:10.1016/j.epsl.2005.09.054 http://www.people.fas.harvard.edu/%7emukhop/PTB-He.pdf Earth and Planetary Science Letters Farley, K.A., P. Ward, G. Garrison, and S. Mukhopadhyay. 2005. Absence of extraterrestrial 3He in Permian-Triassic age sedimentary rocks. Earth and Planetary Science Letters 240(2): 265-275. 0012-821X http://nrs.harvard.edu/urn-3:HUL.InstRepos:4725619 |
op_doi |
https://doi.org/10.1016/j.epsl.2005.09.054 |
container_title |
Earth and Planetary Science Letters |
container_volume |
240 |
container_issue |
2 |
container_start_page |
265 |
op_container_end_page |
275 |
_version_ |
1766265867858870272 |