西藏聂拉木三叠系土隆群-曲龙共巴组稳定碳同位素组成及对比

安显银; 张予杰; 朱同兴; 张以春; 袁东勋; 李俊

doi:10.3799/dqkx.2020.085

Volume 45 Issue 8

Aug. 2020

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Article Navigation > Earth Science > 2020 > 45(8): 2964-2977

An Xianyin, Zhang Yujie, Zhu Tongxing, Zhang Yichun, Yuan Dongxun, Li Jun, 2020. Stable Carbon Isotope Perturbations Recorded in Triassic Tulong Group-Qulonggongba Formation of South Tibet. Earth Science, 45(8): 2964-2977. doi: 10.3799/dqkx.2020.085

Citation:

An Xianyin, Zhang Yujie, Zhu Tongxing, Zhang Yichun, Yuan Dongxun, Li Jun, 2020. Stable Carbon Isotope Perturbations Recorded in Triassic Tulong Group-Qulonggongba Formation of South Tibet. Earth Science, 45(8): 2964-2977. doi: 10.3799/dqkx.2020.085

Citation:

An Xianyin, Zhang Yujie, Zhu Tongxing, Zhang Yichun, Yuan Dongxun, Li Jun, 2020. Stable Carbon Isotope Perturbations Recorded in Triassic Tulong Group-Qulonggongba Formation of South Tibet. Earth Science, 45(8): 2964-2977. doi: 10.3799/dqkx.2020.085

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Stable Carbon Isotope Perturbations Recorded in Triassic Tulong Group-Qulonggongba Formation of South Tibet

doi: 10.3799/dqkx.2020.085

1.
Chengdu Center of China Geological Survey, Chengdu 610081, China
2.
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China

Received Date: 2020-03-31
Publish Date: 2020-08-15

Abstract

Abstract

In the aftermath of the Permian-Triassic mass extinction during the Paleozoic-Mesozoic transition,Triassic oceans were characterized by the long-term and complex biological and environmental changes. Here it reports a stratigraphic study of the Tulong section using ammonites,conodonts and stable carbon isotope in South Tibet. The carbon isotope curves show six negative shifts and five positive peaks from earliest Triassic to middle Late Triassic. Within these carbon isotopic perturbations,the four negative and four positive shifts of the Early Triassic are well correlative with the profiles of South China and Japan,suggesting that the studied area records global signals for multi-phase environmental and biotic changes. Meanwhile,a distinct negative carbon isotope shift,with a decrease of 3.3‰,occurred in the Late Triassic of the Tulong section,is indicative to the Carnian climatic event,which has been extensively found in Italy,Japan and South China. This study presents a successive carbon isotope curve with few biostratigraphic records throughout the Triassic,firstly reporting the Carnian climatic event in Tibet. The rapid temperature rise in the humid climate,intensive weathering and strong terrestrial input might contribute to the distinct lithological changes of the Middle Carnian in the study area.
- carbon isotope,
- Triassic,
- Tulong Group,
- Qulonggongba Formation,
- Tibet,
- stratigraphy

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References(74)

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