古新世—始新世极热事件(PETM)的陆相记录:现状与展望
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本文为国家自然科学基金资助项目(编号:42272114)和江苏省自然科学基金资助项目(编号:BK20211270)的成果


The continental records of the Paleocene—Eocene thermal maximum (PETM): Status and prospects
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    摘要:

    古新世—始新世极热事件(Paleocene—Eocene thermal maximum, PETM)是发生在古新世与始新世界线附近的一次全球快速增温事件。研究显示,PETM期间全球大气CO2浓度增加,温度上升,陆地水循环加强,在陆地和海洋中产生了一系列生物—环境响应。目前,PETM研究主要集中在海相地层中,而针对陆相地层的相关报道并不多见。陆相沉积速率较快,沉积地层厚度大,并且保存有丰富的哺乳动物化石和植物孢粉,也适合开展高分辨率古气候研究。本文对北美、欧洲西部和我国典型陆相盆地的PETM研究成果进行了系统性综述,对比分析结果表明,PETM期间陆相地层中的碳同位素偏移过程可以分为快速负偏、保持低值和缓慢恢复三个阶段。陆地植物和哺乳动物在PETM期间并未经历大规模灭绝,反而通过进化、扩散和局部灭绝适应了快速变化的环境。基于最新的研究方法,包括碳酸盐岩U- Pb定年、汞同位素以及团簇同位素,对我国未来的PETM陆相记录研究提出了展望。

    Abstract:

    The continental records of the continental records of the Paleocene—Eocene thermal maximum (PETM) is conducive to carrying out paleoclimate research and revealing the response law of the terrestrial environment to climate change. The aim of this paper is summarizing the PETM research results of typical continental basins in North America, western Europe and China.Methods:Based on summarizing and comparative analysis of lithofacies and carbon isotopes in different sections.Results:First, the comparative analysis shows that the carbon isotope excursion process in continental strata during the PETM can be divided into three phases: Fast negative deviation, low value and slow recovery. Second, concomitant with the carbon isotope excursion that marks the PETM, the lithofacies usually changed to the conglomerate, sandstone body and paleosoil with coarse grains, representing a seasonal intensification of precipitation. Third, mammals and plants on land adapted to rapidly changing environment by evolution, dispersal and local extinction.Conclusions:There are still some problems in the study of PETM continental records in China, such as lack of accurate age constraints and systematic paleontological fossil studies. Future research on PETM should promote the research idea of combining multiple dating methods and multiple index records on the basis of the original profile, and try to find ideal profile in Jianghan Basin and other areas with research potential to carry out systematic work.

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罗星宇,王平,罗才蓉,吕苗,李善营,魏晓椿.2023.古新世—始新世极热事件(PETM)的陆相记录:现状与展望[J].地质论评,69(5):1899-1918,[DOI].
LUO Xingyu, WANG Ping, LUO Cairong, LV Miao, LI Shanying, WEI Xiaochun.2023. The continental records of the Paleocene—Eocene thermal maximum (PETM): Status and prospects[J]. Geological Review,69(5):1899-1918.

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  • 收稿日期:2023-02-18
  • 最后修改日期:2023-07-11
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  • 在线发布日期: 2023-09-20
  • 出版日期: 2023-09-15