气候变化领域集成服务门户(CCPortal): An 11 million-year-long record of astronomically forced fluvial-alluvial deposition and paleoclimate change in the Early Cretaceous Songliao synrift basin; China

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DOI	10.1016/j.palaeo.2019.109555
	An 11 million-year-long record of astronomically forced fluvial-alluvial deposition and paleoclimate change in the Early Cretaceous Songliao synrift basin; China
	Liu W.; Wu H.; Hinnov L.A.; Baddouh M.; Wang P.; Gao Y.; Zhang S.; Yang T.; Li H.; Wang C.
发表日期	2020
ISSN	0031-0182
卷号	541
英文摘要	In the Cretaceous Songliao Basin, northeastern China, boreholes have recovered detailed geologic data from sub-basins that developed during the early rifting of the basin. Among these, the Lower Cretaceous Shahezi Formation (K1s) in the Songshen 4 (SS4) Well is represented by an 836-m-thick succession of fluvial-alluvial deposits, with coals distributed throughout the upper part of the formation. Gamma-ray (GR) logging data are quantitatively related to grain size-defined litho-facies that recur throughout the succession, with high GR values in mudstones and low GR values in sandstones. Cyclostratigraphic analysis of the GR log reveals depositional cycling at frequencies that are consistent with those of the Earth's astronomical parameters. The results also indicate that occurrence of coal beds occur every ~100 kyr, when development of vegetation at the depositional site was promoted by humid climate. We propose a model of astronomically forced hydroclimate change to explain the cycling of depositional environments between fluvial and alluvial conditions. The model describes a principally fluvial environment that episodically experienced, at one extreme, advancing alluvial conditions involving a drop in base level, lake recession and increased aridity (conglomerates and coarse sands), and at the other extreme, an advancing lakeshore with a rise in base level and increased humidity (fine sands, silts, muds and coal). A floating astronomical time scale was established by calibrating long orbital eccentricity (405-kyr) cycles interpreted along the GR series. The results indicate that the duration of the K1s is 11.14 Myr (27.5405-kyr long orbital eccentricity cycles), corresponding to an average sedimentation rate of 6.55 cm/kyr. The recognition of astronomical forcing in this early Cretaceous fluvial-alluvial-dominated depositional setting offers a new framework for interpreting the sedimentary cyclicity and dynamics of early rift basins and for developing time scales. © 2019 Elsevier B.V.
英文关键词	Early Cretaceous; Milankovitch cycles; Shahezi formation; Xujiaweizi depression
语种	英语
scopus关键词	alluvial deposit; astronomy; climate cycle; coal seam; Cretaceous; cyclostratigraphy; deposition; fluvial deposit; historical record; hydrometeorology; paleoclimate; rifting; China; Songliao 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/150609
作者单位	State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing, 100083, China; School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China; Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, VA 22030, United States; College of Earth Sciences, Jilin University, Changchun, 130061, China; Research Center of Palaeontology and Stratigraphy, Jilin University, Changchun, 130026, China
推荐引用方式 GB/T 7714	Liu W.,Wu H.,Hinnov L.A.,et al. An 11 million-year-long record of astronomically forced fluvial-alluvial deposition and paleoclimate change in the Early Cretaceous Songliao synrift basin; China[J],2020,541.
APA	Liu W..,Wu H..,Hinnov L.A..,Baddouh M..,Wang P..,...&Wang C..(2020).An 11 million-year-long record of astronomically forced fluvial-alluvial deposition and paleoclimate change in the Early Cretaceous Songliao synrift basin; China.Palaeogeography, Palaeoclimatology, Palaeoecology,541.
MLA	Liu W.,et al."An 11 million-year-long record of astronomically forced fluvial-alluvial deposition and paleoclimate change in the Early Cretaceous Songliao synrift basin; China".Palaeogeography, Palaeoclimatology, Palaeoecology 541(2020).