气候变化领域集成服务门户(CCPortal): Astronomical forcing of lake evolution in the Lanzhou Basin during early Miocene period

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DOI	10.1016/j.epsl.2020.116648
	Astronomical forcing of lake evolution in the Lanzhou Basin during early Miocene period
	Wang Z.; Zhang Z.; Huang C.; Shen J.; Sui Y.; Qian Z.
发表日期	2021
ISSN	0012821X
卷号	554
英文摘要	Orbital-scale East Asian summer monsoon (EASM) variability has been extensively investigated in Pliocene-Quaternary loess and marine sediments. In recent years, middle-late Miocene orbital-scale EASM variability has been depicted in lacustrine deposits from NE Tibetan basins, showing a dominant cyclicity of ∼100 kyr eccentricity. However, EASM variability during the early Miocene time remains poorly understood. Here, we investigate the sedimentary record of the early Miocene Xianshuihe Formation, Lanzhou Basin, in order to further constrain the NE Tibetan hydrological evolution and link it to orbital-scale monsoonal variability. By analyzing the lithology, magnetostratigraphy and cyclostratigraphic records of a 270-m section, we show that Lanzhou lake expansion cycles were consistently dominated by ∼100 kyr eccentricity forcing in early Miocene, except for the ∼20.8-19.8 Ma interval showing dominant obliquity control. These records are in agreement with deep-sea oxygen isotopic records, and are potentially linked to Antarctic ice sheet modulations related the precession amplitude modulation by eccentricity. A weakening of weathering intensity in Lanzhou Basin after 20.8 Ma may be attributed to orogenic barriers for westerly moisture and weakened surface temperature resulted from the rapid uplift of NE Tibet and surrounding mountains in the time interval of late Oligocene-early Miocene. © 2020 Elsevier B.V.
英文关键词	astronomical forcing; early Miocene; East Asian summer monsoon; Lanzhou Basin; magnetostratigraphy
语种	英语
scopus关键词	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/158319
作者单位	State Key Laboratory of Biogeology and Environmental Geology; School of Earth Sciences; China University of Geosciences; Wuhan; 430074; China; The School of Resources Environment Science and Technology; Hubei University of Science and Technology; Xianning; 437100; China
推荐引用方式 GB/T 7714	Wang Z.,Zhang Z.,Huang C.,et al. Astronomical forcing of lake evolution in the Lanzhou Basin during early Miocene period[J],2021,554.
APA	Wang Z.,Zhang Z.,Huang C.,Shen J.,Sui Y.,&Qian Z..(2021).Astronomical forcing of lake evolution in the Lanzhou Basin during early Miocene period.,554.
MLA	Wang Z.,et al."Astronomical forcing of lake evolution in the Lanzhou Basin during early Miocene period".554(2021).