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首页> 外文期刊>Journal of Asian earth sciences >Palaeoenvironmental changes in Eocene Tibetan lake systems traced by geochemistry, sedimentology and palynofacies
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Palaeoenvironmental changes in Eocene Tibetan lake systems traced by geochemistry, sedimentology and palynofacies

机译：地球化学，沉积学和野生遗传学追踪的栖息湖系统的古环境变化

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摘要

Ancient lake deposits preserve detailed records of Cenozoic environmental changes, providing information on past climate, vegetation, precipitation and lake chemistry. This study focuses on palaeoenvironmental changes recorded in Eocene limnic environments across what is today the modern Tibetan Plateau. We describe a section dated as late Eocene (-38-37 Ma) and integrate these findings within a regional context of similarly-aged Tibetan lake deposits across the plateau. These sedimentary archives of environmental change indicate a period of late Eocene aridification and cooling in the lead-up to the greenhouse-icehouse transition, which remains poorly understood in Central Asia. We show, based on geochemical, sedimentological, and palynofacies analyses, that a large saline lake existed within a semi-arid to arid steppe environment in the Nangqian Basin, east-central Tibet. The saline lake experienced cyclic drying intervals with shifts to a playa lake / mudflat system. Evidence of increased aridity is recorded in the upper part of the section, including a thinning of gypsum beds, decrease in palynomorph abundance, and concurrent increase in wood debris and amorphous organic matter. This is consistent with late Eocene aridity in Asia, drying of the playa lake, and an impoverished desert-steppe vegetation. Grain size data and geochemistry indicate a stable provenance of sedimentary material, suggesting that tectonic activity did not dominate sedimentation in east-central Tibet during deposition of these successions. Rather, palaeoenvironmental changes across the Tibetan region were most probably controlled by global climate oscillations and retreat of the proto-Paratethys Sea during the late Eocene: knowledge that is relevant for ecological interpretations through the Cenozoic, Quaternary and to the present.
机译：古湖泊沉积物保存的新生界环境变化的详细记录，对过去的气候，植被，降水和湖泊的化学提供信息。本研究的重点跨越今天的现代青藏高原什么是记录在始新世湖沼环境的古环境变化。我们描述了作为日晚始新世（-38-37马）段和整个高原类似老年西藏一湖泊沉积物的区域范围内整合了这些发现。环境变化的这些沉积档案表明期晚始新世干旱化和筹备阶段冷却到温室冰窖过渡，这仍然是中亚知之甚少。我们展示的基础上，地球化学，沉积学和孢粉分析，一个大盐湖半干旱向干旱草原环境在囊谦盆地，西藏中东部内存在。盐湖经历循环干燥的间隔转移到一滩湖泊/滩涂系统。增加干旱的证据被记录在部分的上部部分，包括石膏层变薄，在孢粉丰度降低，并且在木材碎片和非晶有机物同时增加。这是始新世晚期干旱在亚洲，盐湖湖水的干燥和贫困荒漠草原植被是一致的。粒度数据和地球化学表明沉积材料的稳定来源，这表明构造活动，这些继承的沉积过程中并没有占据主导地位沉淀中东部的西藏。知识是相关的在新生代第四纪和本解释生态：相反，在整个西藏地区古环境变化很可能是由全球气候振荡和原潘诺尼亚海海退的晚始新世期间控制。

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  • 来源
    《Journal of Asian earth sciences》 |2021年第1期|104778.1-104778.15|共15页
  • 作者

    Yuan Qin; Barbolini Natasha; Ashworth Luisa; Rydin Catarina; Gao Dong-Lin; Shan Fa-Shou; Zhong Xiao-Yong; Vajda Vivi;

  • 作者单位

    Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens & Highly Efficient Utilizat Sa Xining Peoples R China|Chinese Acad Sci Qinghai Inst Salt Lakes Qinghai Prov Key Lab Geol & Environm Salt Lakes Xining Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China|Swedish Museum Nat Hist Dept Palaeobiol Stockholm Sweden;

    Stockholm Univ Dept Ecol Environm & Plant Sci SE-10691 Stockholm Sweden|Stockholm Univ Bolin Ctr Climate Res SE-10691 Stockholm Sweden|Univ Amsterdam Inst Biodivers & Ecosyst Dynam Dept Ecosyst & Landscape Dynam NL-1098 XH Amsterdam Netherlands;

    Victoria Univ Wellington Sch Geog Environm & Earth Sci POB 600 Wellington 6012 New Zealand;

    Stockholm Univ Dept Ecol Environm & Plant Sci SE-10691 Stockholm Sweden|Stockholm Univ Bolin Ctr Climate Res SE-10691 Stockholm Sweden|Royal Swedish Acad Sci Bergius Fdn Box 50005 SE-10405 Stockholm Sweden;

    Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens & Highly Efficient Utilizat Sa Xining Peoples R China|Chinese Acad Sci Qinghai Inst Salt Lakes Qinghai Prov Key Lab Geol & Environm Salt Lakes Xining Peoples R China;

    Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens & Highly Efficient Utilizat Sa Xining Peoples R China|Chinese Acad Sci Qinghai Inst Salt Lakes Qinghai Prov Key Lab Geol & Environm Salt Lakes Xining Peoples R China;

    Univ China Min & Technol Beijing 100049 Peoples R China;

    Swedish Museum Nat Hist Dept Palaeobiol Stockholm Sweden;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Grain size; Steppe-desert; Proto-Paratethys Sea; Aridification; Central Asia; Cenozoic; Quaternary;

    机译：谷物尺寸;草原 - 沙漠;Proto-ParateShys Sea;Aridification;中亚;新生代;第四纪;

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