DOI: 10.1016/j.epsl.2020.116648
论文题名: Astronomical forcing of lake evolution in the Lanzhou Basin during early Miocene period
作者: Wang Z. ; Zhang Z. ; Huang C. ; Shen J. ; Sui Y. ; Qian Z.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 554 语种: 英语
中文关键词: astronomical forcing
; early Miocene
; East Asian summer monsoon
; Lanzhou Basin
; magnetostratigraphy
英文关键词: Lithology
; Modulation
; Submarine geology
; Weathering
; Antarctic ice sheets
; Astronomical forcing
; East Asian summer monsoon
; Lacustrine deposits
; Magnetostratigraphy
; Marine sediments
; Sedimentary records
; Surface temperatures
; Lakes
; cyclostratigraphy
; lake evolution
; lithology
; magnetostratigraphy
; Miocene
; monsoon
; orbital forcing
; paleoclimate
; paleolimnology
; Pliocene-Pleistocene boundary
; summer
; uplift
; China
; Gansu
; Lanzhou
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165710
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Wang Z.,Zhang Z.,Huang C.,et al. Astronomical forcing of lake evolution in the Lanzhou Basin during early Miocene period[J]. Earth and Planetary Science Letters,2021-01-01,554