Journal
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
Volume 510, Issue -, Pages 78-92Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.palaeo.2017.10.030
Keywords
Paleogene; Astronomical time scale; Orbital forcing; Lacustrine facies; Basin subsidence; Time series analysis
Funding
- NSFC [41772148, 41772029, 41202087, 41322013]
- National Key Basic Research program [2016ZX05060-004, 2014CB239100]
- 111 Projects [B14031, B08030]
- Natural Science Foundation for Distinguished Young Scholars of Hubei Province of China [2016CFA051]
- China Geological Survey program [12120114046601]
- U.S. National Science Foundation (Sedimentary Geology and Paleobiology program)
- NASA Exobiology program
- China University of Geosciences-Wuhan (SKL-GPMR program) [GPMR201301]
- China University of Geosciences-Wuhan (SKLBGEG program) [BGL201407]
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The Paleogene succession of the Bohai Bay Basin (BBB), a highly productive petroleum basin in northeastern China with predominantly lacustrine fill, is poorly dated at present. Here, we generated an internal astronomical time scale (ATS) for the Paleogene strata of the Bohai Bay Basin (Dongying Depression, Jiyang Subbasin) using multitaper method (MTM) spectral analysis of high-resolution gamma ray logs. This ATS, which extends from 66 to 23 Ma, is anchored to the standard geologic time scale by calibration to the Paleogene/Neogene boundary (23.03 Ma) at the top of Dongying Formation. Based on this ATS, we recalibrated the ages of biozones, rifting episodes, and paleoclimate stages within the BBB. The recalibrated ages of rifting episodes and related fluctuations in sedimentation rates exhibit a close relationship to secular variation in production rates of Pacific oceanic plateaus and spreading rates of the Southeast Indian Ridge, confirming that the subsidence history of the BBB was significantly influenced by subduction of the Pacific Plate along the eastern margin of Asia and by collision of the Indian and Eurasian plates. Age recalibration also facilitated re-evaluation of the relationship of sedimentation in the Bohai Bay Basin to the Paleogene climate history of East Asia, e.g., confirming a cooling and drying trend throughout the Eocene.
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