Oxygen and carbon isotope records of calcareous nannofossils for the past 1 Ma in the southern South China Sea

Author(s): Liu Chuanlian; Cheng Xinrong; Zhu Youhua; Tian Jun; Xia Peifen
Author Affiliation(s): Primary:
Tongji University, Shanghai, China
Chinese Academy of Sciences, China
Volume Title: Chinese Science Bulletin
Source: Chinese Science Bulletin, 47(10), p.798-803. Publisher: Science Press, Beijing, China. ISSN: 1001-6538
Note: In English. 20 refs.; illus., incl. 1 table
Summary: Oxygen and carbon isotopic analyses have been carried out on calcareous nannofossils from ODP Site 1143 in the southern South China Sea. The results demonstrate that the δ18O values of calcareous nannofossils for the past 1 Ma vary systematically with those of planktonic and benthic foraminifera form the same site. But the average δ18O value of nannofossils is 1.869 per mil higher than that of planktonic foraminifera, and is 3.855 per mil lower than that of benthic foraminifera. There are systematic differences between the δ13C values of nannofossils, planktonic foraminifera and benthic foraminifera. The average δ13C of nannofossils is 0.756 per mil higher than that of benthic foraminifera, and is 0.460 per mil lower than that of planktonic foraminifera. The δ13C values of nannofossils exhibit a significant positive shift beginning near isotope stage 14 and lasting until stage 8. This study also finds that there is a close relationship between the δ13C of nannofossils and the percentage of Florisphaera profunda. This implies that the δ13C of nannofossils can be used as an indicator of sea water surface paleoproductivity.
Year of Publication: 2002
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 24 Surficial Geology, Quaternary Geology; Algae; Benthic taxa; C-13/C-12; Carbon; Cenozoic; Foraminifera; Geochemical indicators; Geochemistry; Holocene; Invertebrata; Isotope ratios; Isotopes; Leg 184; Microfossils; Middle Pleistocene; Nannofossils; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 1143; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleoenvironment; Paleoproductivity; Planktonic taxa; Plantae; Pleistocene; Protista; Quaternary; South China Sea; Stable isotopes; West Pacific
Coordinates: N092143 N092143 E1131707 E1131707
Record ID: 2003079107
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