Distribution and isotopic composition of foraminifera at cold-seep Site 973-4 in the Dongsha area, northeastern South China Sea
A 1375-cm-long gravity core (Site 973-4) was acquired from the Dongsha cold seep area of the northeastern South China Sea (SCS). We measured its stable isotopes of planktonic foraminifera and investigated benthic foraminiferal assemblage compositions. Accelerator mass spectrometry C-14 analysis of p...
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2018
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Online Access: | http://ir.giec.ac.cn/handle/344007/29801 http://ir.giec.ac.cn/handle/344007/29802 https://doi.org/10.1016/j.jseaes.2018.05.007 |
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ftchacadsciegiec:oai:ir.giec.ac.cn:344007/29802 2023-05-15T18:00:41+02:00 Distribution and isotopic composition of foraminifera at cold-seep Site 973-4 in the Dongsha area, northeastern South China Sea Zhang, Bidong Pan, Mengdi Wu, Daidai Wu, Nengyou 2018-12-01 http://ir.giec.ac.cn/handle/344007/29801 http://ir.giec.ac.cn/handle/344007/29802 https://doi.org/10.1016/j.jseaes.2018.05.007 英语 eng PERGAMON-ELSEVIER SCIENCE LTD JOURNAL OF ASIAN EARTH SCIENCES http://ir.giec.ac.cn/handle/344007/29801 http://ir.giec.ac.cn/handle/344007/29802 doi:10.1016/j.jseaes.2018.05.007 Foraminifera Assemblage Stable isotopes Cold seep The South China Sea ORGANIC-CARBON FLUX LIVING BENTHIC FORAMINIFERA DEEP-WATER PALEOCEANOGRAPHY MODERN METHANE SEEPS CONTINENTAL-SLOPE COMMUNITY STRUCTURE DISSOLVED-OXYGEN HYDROCARBON-SEEP ADRIATIC SEA INDIAN-OCEAN Geology Geosciences Multidisciplinary 期刊论文 2018 ftchacadsciegiec https://doi.org/10.1016/j.jseaes.2018.05.007 2022-09-23T14:16:51Z A 1375-cm-long gravity core (Site 973-4) was acquired from the Dongsha cold seep area of the northeastern South China Sea (SCS). We measured its stable isotopes of planktonic foraminifera and investigated benthic foraminiferal assemblage compositions. Accelerator mass spectrometry C-14 analysis of planktonic foraminifera shows that some intervals are dated to Marine Isotope Stage (MIS) 3. Pulleniatina obliquiloculata has positive delta C-13 (0.25-1.25 parts per thousand) except for a negative carbon isotopic excursion (up to delta C-13 = 1.15 parts per thousand), but its light -carbon sources remain elusive. The benthic delta C-13 values (Uvigerina) of non -seep and cold-seep boreholes from the SCS have no systematic difference. Therefore, the benthic delta C-13 at Site 973-4 did not record the enhanced seepage activities (if occurred) during the last sea-level lowstand in the Dongsha area. In the pre-Holocene sediments, the foraminiferal assemblages have lower diversities, Shannon-Wiener indices, evenness indices, Simpson indices and higher calcareous proportions like typical cold-seep settings. The changes in oxygen levels (lower in the glacial period than those in the Holocene) indicated by foraminiferal indices reflect either bottom-water oxygen variations on the glacial-interglacial scale or enhanced seepage activities during the last glacial period. Report Planktonic foraminifera Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR Indian Journal of Asian Earth Sciences 168 145 154 |
institution |
Open Polar |
collection |
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR |
op_collection_id |
ftchacadsciegiec |
language |
English |
topic |
Foraminifera Assemblage Stable isotopes Cold seep The South China Sea ORGANIC-CARBON FLUX LIVING BENTHIC FORAMINIFERA DEEP-WATER PALEOCEANOGRAPHY MODERN METHANE SEEPS CONTINENTAL-SLOPE COMMUNITY STRUCTURE DISSOLVED-OXYGEN HYDROCARBON-SEEP ADRIATIC SEA INDIAN-OCEAN Geology Geosciences Multidisciplinary |
spellingShingle |
Foraminifera Assemblage Stable isotopes Cold seep The South China Sea ORGANIC-CARBON FLUX LIVING BENTHIC FORAMINIFERA DEEP-WATER PALEOCEANOGRAPHY MODERN METHANE SEEPS CONTINENTAL-SLOPE COMMUNITY STRUCTURE DISSOLVED-OXYGEN HYDROCARBON-SEEP ADRIATIC SEA INDIAN-OCEAN Geology Geosciences Multidisciplinary Zhang, Bidong Pan, Mengdi Wu, Daidai Wu, Nengyou Distribution and isotopic composition of foraminifera at cold-seep Site 973-4 in the Dongsha area, northeastern South China Sea |
topic_facet |
Foraminifera Assemblage Stable isotopes Cold seep The South China Sea ORGANIC-CARBON FLUX LIVING BENTHIC FORAMINIFERA DEEP-WATER PALEOCEANOGRAPHY MODERN METHANE SEEPS CONTINENTAL-SLOPE COMMUNITY STRUCTURE DISSOLVED-OXYGEN HYDROCARBON-SEEP ADRIATIC SEA INDIAN-OCEAN Geology Geosciences Multidisciplinary |
description |
A 1375-cm-long gravity core (Site 973-4) was acquired from the Dongsha cold seep area of the northeastern South China Sea (SCS). We measured its stable isotopes of planktonic foraminifera and investigated benthic foraminiferal assemblage compositions. Accelerator mass spectrometry C-14 analysis of planktonic foraminifera shows that some intervals are dated to Marine Isotope Stage (MIS) 3. Pulleniatina obliquiloculata has positive delta C-13 (0.25-1.25 parts per thousand) except for a negative carbon isotopic excursion (up to delta C-13 = 1.15 parts per thousand), but its light -carbon sources remain elusive. The benthic delta C-13 values (Uvigerina) of non -seep and cold-seep boreholes from the SCS have no systematic difference. Therefore, the benthic delta C-13 at Site 973-4 did not record the enhanced seepage activities (if occurred) during the last sea-level lowstand in the Dongsha area. In the pre-Holocene sediments, the foraminiferal assemblages have lower diversities, Shannon-Wiener indices, evenness indices, Simpson indices and higher calcareous proportions like typical cold-seep settings. The changes in oxygen levels (lower in the glacial period than those in the Holocene) indicated by foraminiferal indices reflect either bottom-water oxygen variations on the glacial-interglacial scale or enhanced seepage activities during the last glacial period. |
format |
Report |
author |
Zhang, Bidong Pan, Mengdi Wu, Daidai Wu, Nengyou |
author_facet |
Zhang, Bidong Pan, Mengdi Wu, Daidai Wu, Nengyou |
author_sort |
Zhang, Bidong |
title |
Distribution and isotopic composition of foraminifera at cold-seep Site 973-4 in the Dongsha area, northeastern South China Sea |
title_short |
Distribution and isotopic composition of foraminifera at cold-seep Site 973-4 in the Dongsha area, northeastern South China Sea |
title_full |
Distribution and isotopic composition of foraminifera at cold-seep Site 973-4 in the Dongsha area, northeastern South China Sea |
title_fullStr |
Distribution and isotopic composition of foraminifera at cold-seep Site 973-4 in the Dongsha area, northeastern South China Sea |
title_full_unstemmed |
Distribution and isotopic composition of foraminifera at cold-seep Site 973-4 in the Dongsha area, northeastern South China Sea |
title_sort |
distribution and isotopic composition of foraminifera at cold-seep site 973-4 in the dongsha area, northeastern south china sea |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2018 |
url |
http://ir.giec.ac.cn/handle/344007/29801 http://ir.giec.ac.cn/handle/344007/29802 https://doi.org/10.1016/j.jseaes.2018.05.007 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
JOURNAL OF ASIAN EARTH SCIENCES http://ir.giec.ac.cn/handle/344007/29801 http://ir.giec.ac.cn/handle/344007/29802 doi:10.1016/j.jseaes.2018.05.007 |
op_doi |
https://doi.org/10.1016/j.jseaes.2018.05.007 |
container_title |
Journal of Asian Earth Sciences |
container_volume |
168 |
container_start_page |
145 |
op_container_end_page |
154 |
_version_ |
1766169876732313600 |