Helium isotope ratios and sedimentation rate models of ODP holes
A continuous age model for the brief climate excursion at the Paleocene-Eocene boundary has been constructed by assuming a constant flux of extraterrestrial 3He (3He[ET]) to the seafloor. 3He[ET] measurements from ODP Site 690 provide quantitative evidence for the rapid onset (<few kyr) and short...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.723912 2023-05-15T17:12:13+02:00 Helium isotope ratios and sedimentation rate models of ODP holes Farley, Kenneth A Eltgroth, Selene F MEDIAN LATITUDE: -17.553960 * MEDIAN LONGITUDE: -37.576465 * SOUTH-BOUND LATITUDE: -65.161000 * WEST-BOUND LONGITUDE: -76.357830 * NORTH-BOUND LATITUDE: 30.053080 * EAST-BOUND LONGITUDE: 1.204900 * DATE/TIME START: 1987-01-20T03:15:00 * DATE/TIME END: 1997-01-27T02:00:00 2003-07-06 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.723912 https://doi.org/10.1594/PANGAEA.723912 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.723912 https://doi.org/10.1594/PANGAEA.723912 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Farley, Kenneth A; Eltgroth, Selene F (2003): An alternative age model for the Paleocene-Eocene thermal maximum using extraterrestrial 3He. Earth and Planetary Science Letters, 208(3-4), 135-148, https://doi.org/10.1016/S0012-821X(03)00017-7 113-690B 171-1051B Blake Nose North Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg113 Leg171B Ocean Drilling Program ODP South Atlantic Ocean Dataset 2003 ftpangaea https://doi.org/10.1594/PANGAEA.723912 https://doi.org/10.1016/S0012-821X(03)00017-7 2023-01-20T07:31:27Z A continuous age model for the brief climate excursion at the Paleocene-Eocene boundary has been constructed by assuming a constant flux of extraterrestrial 3He (3He[ET]) to the seafloor. 3He[ET] measurements from ODP Site 690 provide quantitative evidence for the rapid onset (<few kyr) and short duration (<120 kyr) of global warming and of the associated disturbance to the Earth's surficial carbon budget at this time. These observations support astronomically calibrated age models indicating extremely rapid release of isotopically light carbon, possibly from seafloor methane hydrate, as the proximal cause of the event. However, the 3He[ET] technique indicates a previously unrecognized and extreme increase in sedimentation rate coincident with the return of climate proxies to pre-event values. The 3He[ET]-based age model thus suggests a far more rapid recovery from the climatic perturbation than previously proposed or predicted on the basis of the modern carbon cycle, and so may indicate additional or accelerated mechanisms of carbon removal from the ocean-atmosphere system during this period. 3He[ET] was also measured at ODP Site 1051 to test the validity of the Site 690 chronology. Comparison of these data sets seems to require removal of several tens of kyr of sediment within the climatic excursion at Site 1051, an observation consistent with sediment structures and previous age modeling efforts. The Site 1051 age model shows a ~30 kyr period in which climate proxies return toward pre-event values, after which they remain invariant for ~80 kyr. If this rise represents the recovery interval identified at Site 690, then the 3HeET-based age models of the two sites are in good agreement. However, alternative interpretations are possible, and work on less disrupted sites is required to evaluate the reliability of the proposed new chronology of the climate excursion. Regardless of these details, this work shows that the 3HeET technique can provide useful independent evidence for the development and testing of ... Dataset Methane hydrate North Atlantic South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-76.357830,1.204900,30.053080,-65.161000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
113-690B 171-1051B Blake Nose North Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg113 Leg171B Ocean Drilling Program ODP South Atlantic Ocean |
spellingShingle |
113-690B 171-1051B Blake Nose North Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg113 Leg171B Ocean Drilling Program ODP South Atlantic Ocean Farley, Kenneth A Eltgroth, Selene F Helium isotope ratios and sedimentation rate models of ODP holes |
topic_facet |
113-690B 171-1051B Blake Nose North Atlantic Ocean DRILL Drilling/drill rig Joides Resolution Leg113 Leg171B Ocean Drilling Program ODP South Atlantic Ocean |
description |
A continuous age model for the brief climate excursion at the Paleocene-Eocene boundary has been constructed by assuming a constant flux of extraterrestrial 3He (3He[ET]) to the seafloor. 3He[ET] measurements from ODP Site 690 provide quantitative evidence for the rapid onset (<few kyr) and short duration (<120 kyr) of global warming and of the associated disturbance to the Earth's surficial carbon budget at this time. These observations support astronomically calibrated age models indicating extremely rapid release of isotopically light carbon, possibly from seafloor methane hydrate, as the proximal cause of the event. However, the 3He[ET] technique indicates a previously unrecognized and extreme increase in sedimentation rate coincident with the return of climate proxies to pre-event values. The 3He[ET]-based age model thus suggests a far more rapid recovery from the climatic perturbation than previously proposed or predicted on the basis of the modern carbon cycle, and so may indicate additional or accelerated mechanisms of carbon removal from the ocean-atmosphere system during this period. 3He[ET] was also measured at ODP Site 1051 to test the validity of the Site 690 chronology. Comparison of these data sets seems to require removal of several tens of kyr of sediment within the climatic excursion at Site 1051, an observation consistent with sediment structures and previous age modeling efforts. The Site 1051 age model shows a ~30 kyr period in which climate proxies return toward pre-event values, after which they remain invariant for ~80 kyr. If this rise represents the recovery interval identified at Site 690, then the 3HeET-based age models of the two sites are in good agreement. However, alternative interpretations are possible, and work on less disrupted sites is required to evaluate the reliability of the proposed new chronology of the climate excursion. Regardless of these details, this work shows that the 3HeET technique can provide useful independent evidence for the development and testing of ... |
format |
Dataset |
author |
Farley, Kenneth A Eltgroth, Selene F |
author_facet |
Farley, Kenneth A Eltgroth, Selene F |
author_sort |
Farley, Kenneth A |
title |
Helium isotope ratios and sedimentation rate models of ODP holes |
title_short |
Helium isotope ratios and sedimentation rate models of ODP holes |
title_full |
Helium isotope ratios and sedimentation rate models of ODP holes |
title_fullStr |
Helium isotope ratios and sedimentation rate models of ODP holes |
title_full_unstemmed |
Helium isotope ratios and sedimentation rate models of ODP holes |
title_sort |
helium isotope ratios and sedimentation rate models of odp holes |
publisher |
PANGAEA |
publishDate |
2003 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.723912 https://doi.org/10.1594/PANGAEA.723912 |
op_coverage |
MEDIAN LATITUDE: -17.553960 * MEDIAN LONGITUDE: -37.576465 * SOUTH-BOUND LATITUDE: -65.161000 * WEST-BOUND LONGITUDE: -76.357830 * NORTH-BOUND LATITUDE: 30.053080 * EAST-BOUND LONGITUDE: 1.204900 * DATE/TIME START: 1987-01-20T03:15:00 * DATE/TIME END: 1997-01-27T02:00:00 |
long_lat |
ENVELOPE(-76.357830,1.204900,30.053080,-65.161000) |
genre |
Methane hydrate North Atlantic South Atlantic Ocean |
genre_facet |
Methane hydrate North Atlantic South Atlantic Ocean |
op_source |
Supplement to: Farley, Kenneth A; Eltgroth, Selene F (2003): An alternative age model for the Paleocene-Eocene thermal maximum using extraterrestrial 3He. Earth and Planetary Science Letters, 208(3-4), 135-148, https://doi.org/10.1016/S0012-821X(03)00017-7 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.723912 https://doi.org/10.1594/PANGAEA.723912 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.723912 https://doi.org/10.1016/S0012-821X(03)00017-7 |
_version_ |
1766069011163906048 |