Response of larger benthic foraminifera to the Paleocene-Eocene thermal maximum and the position of the Paleocene/Eocene boundary in the Tethyan shallow benthic zones: Evidence from south Tibet
The Paleocene-Eocene thermal maximum (PETM) is one of the most pronounced global warming events in the Cenozoic. This event was associated with a large negative carbon isotope excursion (CIE) and with major changes in the atmosphere, hydrosphere, and biosphere. However, how the larger benthic forami...
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GEOLOGICAL SOC AMER, INC
2019
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Online Access: | http://ir.nigpas.ac.cn/handle/332004/15278 https://doi.org/10.1130/B31813.1 |
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ftchinacscnigpas:oai:ir.nigpas.ac.cn:332004/15278 2023-05-15T17:12:11+02:00 Response of larger benthic foraminifera to the Paleocene-Eocene thermal maximum and the position of the Paleocene/Eocene boundary in the Tethyan shallow benthic zones: Evidence from south Tibet Zhang, Qinghai Willems, Helmut Ding, Lin Xu, Xiaoxia 2019 http://ir.nigpas.ac.cn/handle/332004/15278 https://doi.org/10.1130/B31813.1 英语 eng GEOLOGICAL SOC AMER, INC GEOLOGICAL SOCIETY OF AMERICA BULLETIN http://ir.nigpas.ac.cn/handle/332004/15278 doi:10.1130/B31813.1 CARBON-ISOTOPE EXCURSION SPATIOTEMPORAL PATTERNS STABLE-ISOTOPES METHANE HYDRATE EVOLUTION CLIMATE OCEAN BIOSTRATIGRAPHY TEMPERATURE COLLISION Geology Geosciences Multidisciplinary 期刊论文 2019 ftchinacscnigpas https://doi.org/10.1130/B31813.1 2019-08-14T12:43:29Z The Paleocene-Eocene thermal maximum (PETM) is one of the most pronounced global warming events in the Cenozoic. This event was associated with a large negative carbon isotope excursion (CIE) and with major changes in the atmosphere, hydrosphere, and biosphere. However, how the larger benthic foraminifera (LBFs) in the shallow Tethyan Ocean responded to the PETM remains controversial. In this study, we investigate two shallow-marine, LBF-rich carbonate sections from south Tibet, aiming to locate the position of the Paleocene/Eocene (P/E) boundary in the Tethyan shallow benthic zones (SBZs) and to examine the response of the LBFs to the PETM. Carbon isotope compositions of bulk carbonate were measured to constrain the stratigraphic position of the CIE onset marking the P/E boundary in the sections, and the LBFs were studied in rock thin sections in order to assess their biostratigraphy and to construct the SBZs. The combination of the carbon isotope data and constructed SBZs shows that the P/E boundary is located within SBZS, not at the SBZ4/SBZ5 transition as proposed in the Western Tethyan domain. At the P/E boundary, no evident compositional change in LBF assemblages can be observed. However, a major compositional change in LBF assemblages occurs in the CIE recovery, characterized by the sudden disappearance of Miscellanea, Ranikothalia, Setia, Orbitosiphon, and the initial dominance of porcellaneous-walled Alveolina and Orbitolites together with small miliolids and rotaliids. We tentatively speculate that this compositional change in LBF assemblages may be related to a eutrophication event, likely resulting from intensified continental weathering during the CIE recovery of the PETM. Report Methane hydrate Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences) GSA Bulletin 131 1-2 84 98 |
institution |
Open Polar |
collection |
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacscnigpas |
language |
English |
topic |
CARBON-ISOTOPE EXCURSION SPATIOTEMPORAL PATTERNS STABLE-ISOTOPES METHANE HYDRATE EVOLUTION CLIMATE OCEAN BIOSTRATIGRAPHY TEMPERATURE COLLISION Geology Geosciences Multidisciplinary |
spellingShingle |
CARBON-ISOTOPE EXCURSION SPATIOTEMPORAL PATTERNS STABLE-ISOTOPES METHANE HYDRATE EVOLUTION CLIMATE OCEAN BIOSTRATIGRAPHY TEMPERATURE COLLISION Geology Geosciences Multidisciplinary Zhang, Qinghai Willems, Helmut Ding, Lin Xu, Xiaoxia Response of larger benthic foraminifera to the Paleocene-Eocene thermal maximum and the position of the Paleocene/Eocene boundary in the Tethyan shallow benthic zones: Evidence from south Tibet |
topic_facet |
CARBON-ISOTOPE EXCURSION SPATIOTEMPORAL PATTERNS STABLE-ISOTOPES METHANE HYDRATE EVOLUTION CLIMATE OCEAN BIOSTRATIGRAPHY TEMPERATURE COLLISION Geology Geosciences Multidisciplinary |
description |
The Paleocene-Eocene thermal maximum (PETM) is one of the most pronounced global warming events in the Cenozoic. This event was associated with a large negative carbon isotope excursion (CIE) and with major changes in the atmosphere, hydrosphere, and biosphere. However, how the larger benthic foraminifera (LBFs) in the shallow Tethyan Ocean responded to the PETM remains controversial. In this study, we investigate two shallow-marine, LBF-rich carbonate sections from south Tibet, aiming to locate the position of the Paleocene/Eocene (P/E) boundary in the Tethyan shallow benthic zones (SBZs) and to examine the response of the LBFs to the PETM. Carbon isotope compositions of bulk carbonate were measured to constrain the stratigraphic position of the CIE onset marking the P/E boundary in the sections, and the LBFs were studied in rock thin sections in order to assess their biostratigraphy and to construct the SBZs. The combination of the carbon isotope data and constructed SBZs shows that the P/E boundary is located within SBZS, not at the SBZ4/SBZ5 transition as proposed in the Western Tethyan domain. At the P/E boundary, no evident compositional change in LBF assemblages can be observed. However, a major compositional change in LBF assemblages occurs in the CIE recovery, characterized by the sudden disappearance of Miscellanea, Ranikothalia, Setia, Orbitosiphon, and the initial dominance of porcellaneous-walled Alveolina and Orbitolites together with small miliolids and rotaliids. We tentatively speculate that this compositional change in LBF assemblages may be related to a eutrophication event, likely resulting from intensified continental weathering during the CIE recovery of the PETM. |
format |
Report |
author |
Zhang, Qinghai Willems, Helmut Ding, Lin Xu, Xiaoxia |
author_facet |
Zhang, Qinghai Willems, Helmut Ding, Lin Xu, Xiaoxia |
author_sort |
Zhang, Qinghai |
title |
Response of larger benthic foraminifera to the Paleocene-Eocene thermal maximum and the position of the Paleocene/Eocene boundary in the Tethyan shallow benthic zones: Evidence from south Tibet |
title_short |
Response of larger benthic foraminifera to the Paleocene-Eocene thermal maximum and the position of the Paleocene/Eocene boundary in the Tethyan shallow benthic zones: Evidence from south Tibet |
title_full |
Response of larger benthic foraminifera to the Paleocene-Eocene thermal maximum and the position of the Paleocene/Eocene boundary in the Tethyan shallow benthic zones: Evidence from south Tibet |
title_fullStr |
Response of larger benthic foraminifera to the Paleocene-Eocene thermal maximum and the position of the Paleocene/Eocene boundary in the Tethyan shallow benthic zones: Evidence from south Tibet |
title_full_unstemmed |
Response of larger benthic foraminifera to the Paleocene-Eocene thermal maximum and the position of the Paleocene/Eocene boundary in the Tethyan shallow benthic zones: Evidence from south Tibet |
title_sort |
response of larger benthic foraminifera to the paleocene-eocene thermal maximum and the position of the paleocene/eocene boundary in the tethyan shallow benthic zones: evidence from south tibet |
publisher |
GEOLOGICAL SOC AMER, INC |
publishDate |
2019 |
url |
http://ir.nigpas.ac.cn/handle/332004/15278 https://doi.org/10.1130/B31813.1 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
GEOLOGICAL SOCIETY OF AMERICA BULLETIN http://ir.nigpas.ac.cn/handle/332004/15278 doi:10.1130/B31813.1 |
op_doi |
https://doi.org/10.1130/B31813.1 |
container_title |
GSA Bulletin |
container_volume |
131 |
container_issue |
1-2 |
container_start_page |
84 |
op_container_end_page |
98 |
_version_ |
1766068978985205760 |