Astronomically tuned time scale (12 Ma to 18.3 Ma) for ODP Site 1148, northern South China Sea

Author(s): Tian Jun; Wang Pinxian; Cheng Xinrong; Li Qianyu
Author Affiliation(s): Primary:
Tongji University, State Key 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, 30(5), p.513-518. Publisher: China University of Geoscience, Wuhan, China. ISSN: 1000-2383
Note: In Chinese with English summary. 24 refs.; illus., incl. 1 table, sketch map
Summary: Lithological cyclicity was observed in magnetic susceptibility records of the deep sea sediments from ODP Site 1184 in the northern South China Sea (SCS), and is considered to be related to obliquity cycles in the Miocene and Oligocene. Using recent methodology, an astronomically tuned time scale for the middle Miocene of ODP Site 1148 in the northern SCS was established. After tuning, the magnetic susceptibility (MS) records show strong obliquity and precession cycles as well as prominent eccentricity cycles. The planktonic foraminiferal events identified within the studied interval of ODP Site 1148 show ages very close to those set by Shackleton et al. (1999) for ODP Leg 154, which were obtained by the same astronomical tuning method used in this study, but differ substantially from the traditional age. The results lend support to the practicality of this method for establishing a tuned Miocene time scale.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Cenozoic; Cycles; Leg 184; Magnetic properties; Magnetic susceptibility; Magnetostratigraphy; Middle Miocene; Miocene; Neogene; North Pacific; Northwest Pacific; ODP Site 1148; Ocean Drilling Program; Pacific Ocean; Paleomagnetism; Sedimentary rocks; South China Sea; Tertiary; Time scales; West Pacific
Coordinates: N185010 N185010 E1163356 E1163356
Record ID: 2009041316
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