Responses of foraminiferal isotopic variations at ODP Site 1143 in the southern South China Sea to orbital forcing

Author(s): Tian Jun; Wang Pinxian; Cheng Xinrong
Author Affiliation(s): Primary:
Tongji University, Laboratory of Marine Geology, Shanghai, China
Volume Title: Science in China. Series D, Earth Sciences
Source: Science in China. Series D, Earth Sciences, 47(10), p.943-953. Publisher: Science in China Press, Beijing, China. ISSN: 1006-9313
Note: In English. 26 refs.; illus., incl. 3 tables
Summary: Foraminiferal δ18O and δ13C records for the past 5 Ma at ODP Site 1143 reveal the linear responses of Plio-Pleistocene climate changes in the southern South China Sea to orbital forcing at the obliquity and precession bands. The phase of δ18O variations with orbital forcing is opposite that of δ13C, which may have been caused by the frequent El Nino events in the equatorial Pacific. The amplification of the Northern Hemisphere Ice Sheet at -3.3 Ma probably affected the development of the 100,000-year climate cycles. Its further spreading may have spurred the 100,000-year climate cycle to become the dominant cycle in the late Pleistocene. The "Mid-Pleistocene Transition" event had a localized influence on isotope variations in the southern South China Sea. Foraminiferal δ13C records for the past 5 Ma at Site 1143 are highly coherent with orbital forcing at the long eccentricity band, and lead δ18O records at the shorter eccentricity band, highlighting the importance of the carbon cycle in global climate change.
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; C-13/C-12; Carbon; Carbon cycle; Cenozoic; Climate change; Climate forcing; Foraminifera; Geochemical cycle; Geochemical indicators; Geochemistry; Global change; Ice sheets; Invertebrata; Isotope ratios; Isotopes; Leg 184; Microfossils; Neogene; North Pacific; Northern Hemisphere; Northern Hemisphere ice sheet; Northwest Pacific; O-18/O-16; ODP Site 1143; Ocean Drilling Program; Orbital forcing; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleoecology; Pleistocene; Pliocene; Protista; Quaternary; South China Sea; Stable isotopes; Tertiary; West Pacific
Coordinates: N092143 N092143 E1131707 E1131707
Record ID: 2009038765
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