Stable isotope equilibrium test between benthic Foraminifera Cibicidoides and Uvigerina at ODP Site 1143, southern South China Sea

Author(s): Tian Jun; Wang Pinxian; Cheng Xinrong
Author Affiliation(s): Primary:
Tongji University, Laboratory of Marine Geology, Shanghai, China
Volume Title: Earth Science. Journal of China University of Geoscience
Source: Earth Science. Journal of China University of Geoscience, 29(1), p.1-6. Publisher: China University of Geoscience, Wuhan, China. ISSN: 1000-2383
Note: In Chinese with English summary. 10 refs.; illus., incl. charts, sketch map
Summary: Stable oxygen and carbon isotope records from ODP Site 1143 (9°C21.72'N, 113°C7.11'E, 2772 m) in the southern South China Sea (SCS) are presented for benthic foraminifers Cibicidoides wuetlerstorfi and Uvigerina peregerina in 64 samples. The results show that the average difference in δ18O between Cibicidoides wuellerstorfi and Uvigerinaperegerina in 64 samples from Site 1143 is (0.614± 0.07) × 10-3, close to 0.64 × 10-3, the standard oxygen isotope difference between the Atlantic and the East Pacific. Results show the average δ13C difference between these two species at Site 1143 is (0.692 ± 0.04) × 10-3, much lower than 0.9 × 10-3, the standard carbon isotope difference between the Atlantic and the East Pacific. The lower difference in δ13C at Site 1143 may be due to low productivity in reef areas which decreased the δ13C difference between depositions and sea water. This test at Site 1143 provides an adjustable standard for oxygen and carbon isotope values between the benthic foraminifera Cibicidoides wuellerstorfi and Uvigerina peregerina for paleo-oceanographic studies in the South China Sea and even in the West Pacific.
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Anomalinidae; Benthic taxa; Buliminacea; C-13/C-12; Carbon; Cassidulinacea; Cenozoic; Cibicidoides; Cibicidoides wuellerstorfi; Foraminifera; Geochemical indicators; Geochemistry; Invertebrata; Isotope ratios; Isotopes; Leg 184; Marine environment; Microfossils; Neogene; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 1143; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoecology; Pliocene; Productivity; Protista; Quaternary; Rotaliina; South China Sea; Stable isotopes; Tertiary; Uvigerina; Uvigerina peregrina; Uvigerinidae; West Pacific
Coordinates: N092143 N092143 E1131707 E1131707
Record ID: 2009024957
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