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豫西宜阳地区上二叠统孙家沟组古气候特征分析
投稿时间:2019-11-13  修订日期:2019-12-26  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020050
摘要点击次数: 146
全文下载次数: 167
作者单位E-mail
祁帅帅 河南理工大学资源环境学院 872129348@qq.com 
王艳鹏 河南理工大学资源环境学院  
彭冰柔 河南理工大学资源环境学院  
张碧云 河南理工大学资源环境学院  
宁淑媛 河南理工大学资源环境学院  
刘晓玲 王屋山-黛眉山世界地质公园管理局  
郑德顺 河南理工大学资源环境学院 zhengdeshun@126.com 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)(编号41702106)资助成果
中文摘要:二叠纪-三叠纪之交发生了地史上最大规模的生物灭绝事件,该事件可能与当时气候环境的强烈变化有关。前人对该时期较连续的海相地层揭示的古气候研究较为成熟,而对同时期陆相地层的研究则相对匮乏。本文选取豫西宜阳地区上二叠统孙家沟组为研究对象,运用沉积学、矿物学与元素地球化学等方法对该时期的古气候进行恢复,并与同时期陆相地层对比,进而讨论气候变化对该时期生物灭绝的影响。结果表明:(1)宜阳地区孙家沟组经历了滨湖-浅湖-滨湖等亚相的演化过程,其地层中岩相变化、古生物化石缺失、大量的钙质结核及其它沉积构造的出现揭示了孙家沟组的上段气候明显比下段炎热干旱。(2)元素地球化学指标以及粘土矿物组合的垂向变化等指示了该时期的气候经历了温湿向炎热半干旱-干旱转变。(3)宜阳地区孙家沟组的气候指标所得出的结论与其他地区同时期陆相地层古气候的变化基本一致,反映了研究区与同时期全球古气候的变化存在一致性。二叠纪末期温度的骤升、气候极度干旱化以及陆表生态系统遭受毁灭性破坏等因素,可能是导致或加速陆地生物灭绝的主要原因。本次研究对该时期气候变化与生物灭绝之间的关系具有一定的指导意义,为探讨全球P-T之交生物灭绝的原因提供新的证据。
中文关键词:古气候  生物灭绝  上二叠统孙家沟组  宜阳地区
 
Palaeoclimatic analysis of the Sunjiagou Formation of Upper Permian in Yiyang area,western Henan
Author NameAffiliationE-mail
Qi Shuaishuai Institute of Resources and Environment, Henan Polytechnic University 872129348@qq.com 
Wang Yanpeng Institute of Resources and Environment, Henan Polytechnic University  
Peng Bingrou Institute of Resources and Environment, Henan Polytechnic University  
Zhang Biyun Institute of Resources and Environment, Henan Polytechnic University  
Ning Shuyuan Institute of Resources and Environment, Henan Polytechnic University  
Liu Xiaoling Wangwushan-Daimeishan Mountains World Geopark Authority  
Zheng Deshun Institute of Resources and Environment, Henan Polytechnic University zhengdeshun@126.com 
Abstract:The largest mass extinction event in geological history occurred during the Permian-Triassic boundary, which may be related to the extreme paleoclimate changes at that time. Previous studies on the paleoclimate mainly focus on the continuous marine strata, however, the studies of terrestrial strata in this period are relatively scarce. In this paper, we selected the Upper Permian Sunjiagou Formation in Yiyang area of western Henan as the research object to recover the paleoclimate by sedimentology, mineralogy and elemental geochemistry. Based on the comparision with other terrestrial strata, the impact of climate change on the extinction of the Permian-Triassic boundary are discussed. The results show that: (1) the Sunjiagou Formation has experienced the evolution process of shore lacustrine-shallow lacustrine-shore lacustrine subfacies in Yiyang area, and the lithofacies changes, absence of paleontological fossils, a great number of calcareous concretions and other sedimentary structures show that the climate of the upper member is hotter and more arid than that of the lower member. (2) The geochemical elements and clay mineral assemblage also indicate that the climate experience a transition from warm and humid to hot, arid and semi-arid. (3) The conclusion of this study is basically consistent with other terrestrial strata in the same period, reflecting the consistency with global paleoclimate transformation. The factors such as abrupt rise in temperature, extreme drought of the climate and destruction of the terrestrial ecosystem at the end of the Permian may be the main reasons that leading or accelerating the extinction of terrestrial life. This study has guiding significance for the relationship between climate change and biological extinction in the Permian-Triassic boundary, which provides new evidence to explore the causes of global biological extinction in this period.
keywords:Paleoclimate  Mass extinction  The Sunjiagou Formation of Upper Permian  Yiyang area
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