Time-frequency variations of Plio-Pleistocene foraminiferal isotopes; a case study from 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: Journal of China University of Geosciences
Source: Journal of China University of Geosciences, 15(3), p.283-289. Publisher: China University of Geosciences, Hubei, China. ISSN: 1002-0705
Note: In English. 12 refs.; illus., incl. 1 table
Summary: Continuous wavelet transform (CWF) analysis reveals the instantaneous variability of foraminiferal δ18O and δ13C at ODP Site 1143 for the past 5 Ma at the eccentricity, obliquity and precession bands. Cross CWT analysis further demonstrates the nonstationary phases of benthic δ18O relative to ETP at the three primary Milankovitch bands in the last 5 Ma. The instantaneous phases between benthic δ18O and δ13C at the precession band display a prominent 128 ka period, probably the cyclicity of the nonstationary climate close to the eccentricity. To explain these nonstationary phases, it is desirable to introduce a nonlinear response model to the global climate system, in which the output has a prominent cycle around 100 ka to match the 128 ka cycle of the instantaneous phase of δ13C and δ18O on the precession band.
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; Cenozoic; Foraminifera; Geochemical indicators; Geochemistry; Invertebrata; Isotope ratios; Isotopes; Leg 184; Microfossils; Milankovitch theory; Neogene; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 1143; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Pleistocene; Pliocene; Protista; Quaternary; South China Sea; Stable isotopes; Tertiary; West Pacific
Coordinates: N092143 N092143 E1131707 E1131707
Record ID: 2009037142
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.