气候变化领域集成服务门户(CCPortal): Astronomical forcing and sedimentary noise modeling of lake-level changes in the Paleogene Dongpu Depression of North China

CCPortal

DOI	10.1016/j.epsl.2020.116116
	Astronomical forcing and sedimentary noise modeling of lake-level changes in the Paleogene Dongpu Depression of North China
	Wang M.; Chen H.; Huang C.; Kemp D.B.; Xu T.; Zhang H.; Li M.
发表日期	2020
ISSN	0012821X
卷号	535
英文摘要	Challenges in interpreting continental sequence stratigraphy and typically uncertain geochronology hinder the understanding of paleolake evolution and hydrocarbon exploration in terrestrial basins. The Dongpu Depression in North China is a lacustrine basin with abundant hydrocarbon resources. An accurate chronology for the Paleogene stratigraphy in the Dongpu Depression is lacking, and the mechanism of lake-level variation remains unclear. In this study, we utilize high-resolution gamma ray logs to conduct a cyclostratigraphic analysis of the Shahejie Formation, which is a Paleogene succession in the Dongpu Depression characterized by sandstones and dark mudstones interbedded with thin salt rocks. Time series analysis reveals evidence for 405 kyr eccentricity cycles in the gamma ray series, which is supported by statistical modeling of optimal sedimentation rates. Tuning of the gamma ray data to this 405 kyr eccentricity cyclicity enables a 14.7-Myr-long astronomical time scale to be constructed. This astrochronology is anchored to the astronomical age of the Dongying Formation/Shahejie Formation boundary (28.86 Ma) in the Bohai Bay Basin, thus providing an absolute timescale for the studied interval that extends from 28.86 Ma to 43.59 Ma. Using this anchored astrochronology, we show that a recently established sedimentary noise model for inferring sea level change in marginal marine settings can be used to similarly infer lake level fluctuations in terrestrial basins. In particular, sedimentary noise modeling of the tuned gamma ray series reveals high-resolution changes in sedimentary noise that are indicative of lake-level variations linked to million-year scale (i.e., ∼4.8 Myr, 2.4 Myr and 1.2 Myr) astronomical forcing. These inferred changes in lake level are supported by previously published sequence stratigraphic interpretations. Moreover, an evolutionary correlation coefficient (eCOCO) analysis of the gamma ray series also indicates recurrent distortions in sedimentation that may be linked to lake level changes. This study provides new methods for the assessment of paleolake level variations, as well as insights into the connection between astronomical forcing and lake evolution across long timescales in terrestrial basins. © 2020 Elsevier B.V.
关键词	astronomical forcing cyclostratigraphy lake levels sedimentary noise terrestrial basin
英文关键词	Geochronology; Hydrocarbons; Lakes; Petroleum prospecting; Radioactivity logging; Sea level; Sedimentology; Stratigraphy; Time series analysis; Astronomical forcing; Cyclostratigraphy; Lake levels; sedimentary noise; terrestrial basin; Gamma rays; basin evolution; cyclostratigraphy; lake evolution; lake level; modeling; mudstone; noise; orbital forcing; Paleogene; sandstone; China; Dongpu Depression
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202957
作者单位	Key Laboratory of Tectonics and Petroleum Resource of Ministry of Education, School of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China; Department of Geosciences, Pennsylvania State University, University Park, PA 16802, United States; State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan, Hubei 430074, China; Zhongyuan Oilfield Company of SINOPEC, Puyang, Henan 457001, China
推荐引用方式 GB/T 7714	Wang M.,Chen H.,Huang C.,et al. Astronomical forcing and sedimentary noise modeling of lake-level changes in the Paleogene Dongpu Depression of North China[J],2020,535.
APA	Wang M..,Chen H..,Huang C..,Kemp D.B..,Xu T..,...&Li M..(2020).Astronomical forcing and sedimentary noise modeling of lake-level changes in the Paleogene Dongpu Depression of North China.Earth and Planetary Science Letters,535.
MLA	Wang M.,et al."Astronomical forcing and sedimentary noise modeling of lake-level changes in the Paleogene Dongpu Depression of North China".Earth and Planetary Science Letters 535(2020).