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DOI	10.1016/j.palaeo.2019.109253
	Astronomical time scale of the Paleogene lacustrine paleoclimate record from the Nanxiang Basin; central China
	Xu K.; Chen H.; Huang C.; Ogg J.G.; Zhu J.; Lin S.; Yang D.; Zhao P.; Kong L.
发表日期	2019
ISSN	0031-0182
卷号	532
英文摘要	The chronostratigraphy of the Paleogene succession of the Nanxiang Basin, a petroliferous basin in central China with a predominantly lacustrine fill, remains controversial due to the lack of an accurate geological time scale. In this work, high-resolution gamma-ray (GR) logs from the B270 and BS1 boreholes from depocenters in the Biyang Depression of the Nanxiang Basin were used to analyze the cyclostratigraphy. Paleocene floodplain facies of red clastics and purple mudstone is conformably overlain by Eocene through Oligocene lacustrine facies of gray mudstone, oil shale, and clayey dolomite interbedded with siltstone-sandstone. The multitaper method of spectral analysis and Gaussian bandpass filtering were used to identify Milankovitch cycles. Based on the recognition of 405-kyr long-eccentricity cycles, the series was tuned to establish a 46-Myr floating astronomical time scale (ATS), which was then anchored to the Paleogene/Neogene boundary age of 23.03 Ma. The ATS enables the assignment of the ages to non-marine biozones, depositional facies and rifting episodes within the Nanxiang Basin. The subsidence and rates of sediment accumulation within the rift basin of the Nanxiang Basin has an inverse relationship to the convergence rates between Pacific plates and the eastern margin of Eurasia. The middle Eocene slowing of the convergence rate at ~50 Ma, coupled with the onset of the collision of the Indian and Eurasian plate, corresponds to the beginning of the climax stage of rifting, the development of deep lakes and the deposition of oil shales in the Nanxiang Basin. The organic-rich 3rd member of the Hetaoyuan Formation (Eh3) during this middle Eocene interval preserved a range of climatic cycles from annual varves to a ~1.2-Myr modulation of obliquity cycles, indicating the importance of climatic oscillations on the development of those hydrocarbon source rocks. © 2019 Elsevier B.V.
英文关键词	Biyang Depression; Cyclostratigraphy; Long-period ~1.2-Myr cycles; Sediment accumulation rates; Source rocks
语种	英语
scopus关键词	accumulation rate; borehole; chronostratigraphy; collision; cyclostratigraphy; depocenter; Eocene-Oligocene boundary; geological time; lacustrine environment; oil shale; paleoclimate; Paleogene; sandstone; siltstone; source rock; subsidence; China; Eurasia; Nanxiang Basin
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150855
作者单位	Key Laboratory of Tectonics and Petroleum Resource, Ministry of Education, Faculty of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China; State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan, Hubei 430074, China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China; Geological Scientific Research Institute, Henan Oilfield Company of SINOPEC, Nanyang, Henan 473132, China; Exploration and Development Research Institute, HuaBei Oilfield Company of CNPC, Renqiu, Hebei 062552, China; Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN 47907, United States
推荐引用方式 GB/T 7714	Xu K.,Chen H.,Huang C.,et al. Astronomical time scale of the Paleogene lacustrine paleoclimate record from the Nanxiang Basin; central China[J],2019,532.
APA	Xu K..,Chen H..,Huang C..,Ogg J.G..,Zhu J..,...&Kong L..(2019).Astronomical time scale of the Paleogene lacustrine paleoclimate record from the Nanxiang Basin; central China.Palaeogeography, Palaeoclimatology, Palaeoecology,532.
MLA	Xu K.,et al."Astronomical time scale of the Paleogene lacustrine paleoclimate record from the Nanxiang Basin; central China".Palaeogeography, Palaeoclimatology, Palaeoecology 532(2019).