Sedimentary record of climate change across the Eocene/Oligocene transition from the Qaidam Basin, northeastern Tibetan Plateau
Sedimentary record of climate change across the Eocene/Oligocene transition from the Qaidam Basin, northeastern Tibetan Plateau
复制标题
青藏高原东北部柴达木盆地始新世/渐新世过渡气候变化的沉积记录
DOI：
10.1016/j.palaeo.2020.110203
复制
发表时间：
2021-02
期刊：
影响因子：
--
通讯作者：
Miao Yunfa
中科院分区：
文献类型：
--
作者：
Wang Yadong;Yuan Sihua;Zhang Tao;Liu Xiaoyan;Liu Yongjiang;Miao Yunfa
始新世/渐新世过渡（EOT）的标志是一个重大的环境重组，伴随着地球系统的突然转变，从“温室”到“冰库”的条件，这是很好地记录在海洋沉积记录。虽然有越来越多的陆地记录这一重大的气候重组，高分辨率的沉积学和岩相学证据，从陆地环境是稀疏的，和驱动的EOT影响大陆碎屑沉积物的形成过程尚不清楚。在这里，我们提出的证据，从岩相，岩性，沉积物颜色和沉积物粒度从一个剖面在东北青藏高原（青藏高原）的北方部分，跨越EOT。结果表明，在33.8Ma左右，粉砂和砂岩的粒度（粗化）、色度（红度增加）、厚石膏层（消失）、结构成熟度（圆度降低和分选）、沉积物成分成熟度（岩屑、长石和镁铁质矿物含量增加）发生了重大变化，这些变化被认为是对EOT的响应。柴达木盆地及其周边盆地沉积学、岩石学特征和风化代用指标的同步变化表明，气候对风化侵蚀作用的减弱可能是这些代用指标变化的直接原因。全球变冷可能是控制柴达木盆地乃至亚洲内陆EOT地区气候演化和风化响应的一级驱动因子。一个概念模型，总结了负责整个EOT的沉积特征的观察到的变化的机制。
The Eocene/Oligocene transition (EOT) was marked by a major environmental reorganization accompanied by an abrupt shift of the Earth system from “greenhouse” to “icehouse” conditions, which is well documented in marine sedimentary records. Although there are an increasing number of terrestrial records documenting this major climatic reorganization, high-resolution sedimentologic and petrographic evidence from terrestrial contexts is sparse, and the processes driving the EOT which affected the formation of continental detrital sediments are unclear. Here we present evidence from lithofacies, lithology, sediment color, and sediment grain size from a section in the northern part of the NE Tibetan Plateau (Tibetan Plateau), which spans the EOT. The results indicate that major changes in the grain size (coarsening), chromaticitya*(redness increasing), thick gypsum layers (disappearance), structural maturity (decreasing roundness and sorting), sediment compositional maturity (increasing content of lithic, feldspar and mafic minerals) of silt and sandstone occurred at ~33.8 Ma, which were considered to be a response to the EOT. The synchronous changes in sedimentological and petrological characteristics and weathering proxies in the Qaidam Basin (Qaidam Basin) and neighboring basins suggest that the climate-forced weakening of weathering and erosion may have been the direct cause of those proxy changes the direct cause of those proxy change. Global cooling is speculated to have been the first-order driving factor in regulating climatic evolution and weathering responses in the Qaidam Basin and even the Asian interior at the EOT. A conceptual model is presented which summarizes the mechanisms responsible for the observed changes in sedimentary characteristics across the EOT.
登录
查看更多内容
影响因子：
2.9
作者：
Giosan, L;Flood, RD;Aller, RC
通讯作者：
Aller, RC
DOI：
10.1002/2017jb014216
发表时间：
2017-08
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
--
作者：
Pengju He;Chunhui Song;Yadong Wang;Lihao Chen;P. Chang;Qiangqiang Wang;Bo Ren
通讯作者：
Pengju He;Chunhui Song;Yadong Wang;Lihao Chen;P. Chang;Qiangqiang Wang;Bo Ren
影响因子：
8.9
作者：
Linlin Li;Chaodong Wu;C. Fan;Ji-Jun Li;Changhao Zhang
通讯作者：
Linlin Li;Chaodong Wu;C. Fan;Ji-Jun Li;Changhao Zhang
西宁沉积序列中始新世—渐新世过渡期间的粘土矿物变化发生在全球变冷之前
DOI：
10.1016/j.palaeo.2014.06.031
发表时间：
2014-10
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
张春霞
通讯作者：
张春霞
DOI：
10.1016/j.palaeo.2020.110016
发表时间：
2020-12
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
A. Licht;G. Dupont‐Nivet;N. Meijer;J. Rugenstein;A. Schauer;J. Fiebig;A. Mulch;C. Hoorn;Natasha Barbolini;Zhaojie Guo
通讯作者：
A. Licht;G. Dupont‐Nivet;N. Meijer;J. Rugenstein;A. Schauer;J. Fiebig;A. Mulch;C. Hoorn;Natasha Barbolini;Zhaojie Guo