|Table of Contents|

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

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

Issue:
2025年第02期
Page:
230-247
Research Field:
沉积地质与油气勘探
Publishing date:

Info

Title:
Evolution Processes of Late Permian-Early Triassic Paleoclimate in Emeishan Area of Sichuan, China
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)
Keywords:
paleoclimate;  Late Permian-Early Triassic;  Xuanwei Formation;  Dongchuan Formation;  sedimentary environment;  element geochemistry;  Sichuan Basin
PACS:
P532; P595
DOI:
10.19814/j.jese.2024.11002
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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