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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第47卷

期数:

2025年第02期

页码:

230-247

栏目:

沉积地质与油气勘探

出版日期:

2025-03-15

文章信息/Info

Title:

Evolution Processes of Late Permian-Early Triassic Paleoclimate in Emeishan Area of Sichuan, China

文章编号:

1672-6561(2025)02-0230-18

作者:

周 斌¹; 胡作维¹; 2*; 李 云¹; 2; 任柳洁³

(1. 成都理工大学 沉积地质研究院,四川 成都 610059; 2. 成都理工大学 油气藏地质及开发工程全国重点实验室,四川 成都 610059; 3. 成都理工大学 地球与行星科学学院,四川 成都 610059)

Author(s):

ZHOU Bin¹;  HU Zuo-wei¹; 2*;  LI Yun¹; 2;  REN Liu-jie³

(1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 3. College of Earth and Planetary Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China)

关键词:

古气候;  晚二叠世—早三叠世;  宣威组;  东川组;  沉积环境;  元素地球化学;  四川盆地

Keywords:

paleoclimate;  Late Permian-Early Triassic;  Xuanwei Formation;  Dongchuan Formation;  sedimentary environment;  element geochemistry;  Sichuan Basin

分类号:

P532; P595

DOI:

10.19814/j.jese.2024.11002

文献标志码:

A

摘要:

在二叠纪—三叠纪之交,全球经历了重大的气候变化和生物更替,相关地质事件一直是地学领域的研究热点。四川峨眉山地区发育晚二叠世—早三叠世陆相沉积,其对二叠纪—三叠纪之交的古气候研究具有重要意义。通过野外剖面观察、薄片分析、主微量元素地球化学分析,认为晚二叠世—早三叠世以曲流河环境为主,在早三叠世河流规模变大。其中,晚二叠世(宣威组沉积时期)环境较为稳定,岩石中富含炭屑,长石体积分数低且具有较高的古风化特征相关指数,早三叠世(东川组沉积时期)总体化学风化强度较低,长石体积分数升高并伴随大量同生泥质角砾出现,反映该地区气候在二叠纪—三叠纪之交由潮湿炎热的陆相环境转变为干旱高温的过渡相环境,同时使水体盐度升高。气候的剧变可能由火山活动和不同规模的野火事件引起,同时受到早三叠世巨型季风的影响。

Abstract:

During the Permian-Triassic transition, the world experiences significant climate change and biological turnover, and the related geological events have been a hot research topic in the field of geosciences. The Late Permian-Early Triassic terrestrial deposits in Emeishan area of Sichuan, is of great significance for the study on Permian-Triassic paleoclimate. According to field section observation, thin section analysis, and major and trace element geochemical analysis, the environmental conditions in Late Permian(Xuanwei Formation depositional period)are relatively stable, with abundant charcoal fragments, low content of feldspar, and high ancient weathering index. The overall chemical weathering intensity is low in Early Triassic(Dongchuan Formation depositional period), with an increase in feldspar content and the appearance of large amounts of syn-sedimentary clay conglomerates. The sedimentary environment changes from a single-channel meandering river deposit to a multi-channel braided river deposit, reflecting a transition from a humid and hot terrestrial environment to a dry and hot transition zone environment during the Permian-Triassic transition. The change in climate also causes an increase in water salinity. The dramatic climate change may has been caused by volcanic activity and various wildfire scales, and is also influenced by the giant monsoon in Early Triassic.

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备注/Memo

备注/Memo:

收稿日期:2024-11-03; 修回日期:2024-12-30
基金项目:国家自然科学基金项目(41772100,41372113)
*通信作者:胡作维(1981-),男,广东佛山人,教授,理学博士,E-mail:huzuowei@foxmail.com。

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更新日期/Last Update: 2025-03-20