Magnetostratigraphy across the end-Permian mass extinction event from the Meishan sections, southeastern China,Geology

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Magnetostratigraphy across the end-Permian mass extinction event from the Meishan sections, southeastern China
Geology ( IF 4.8 ) Pub Date : 2021-11-01 , DOI: 10.1130/g49072.1
Min Zhang _{1,

2,

3} , Hua-Feng Qin _{2,

4} , Kuang He _{1,

2} , Yi-Fei Hou _{2,

3,

4} , Quan-Feng Zheng ₅ , Cheng-Long Deng _{2,

3,

4} , Yan He ₆ , Shu-Zhong Shen _{7,

8} , Ri-Xiang Zhu _{2,

3,

4} , Yong-Xin Pan _{1,

2,

3}

Affiliation

Chinese Academy of Sciences (CAS) Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China
College of Earth and Planetary Sciences, University of the Chinese Academy of Sciences, Beijing 101400, China
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China
Agency of GSSP National Nature Reserve of Changxing, Zhejiang 313100, China
State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering and Environment and Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing 210023, China
Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210023, China

The end-Permian mass extinction (EPME) has been recorded as the most severe biodiversity crisis in Earth's history, although the timing of the marine and terrestrial extinctions remains debatable. We present a new high-resolution magnetostratigraphic succession across the EPME and the Permian-Triassic boundary (PTB) from the Meishan sections in southeastern China, which contain the global boundary stratotype section and point (GSSP) for the base of the Triassic (also the Induan Stage) and the base of the Changhsingian Stage. We identified five normal and five reverse magnetozones, including MS1n to MS5n and MS1r to MS5r, from oldest to youngest, in the Changhsingian and Induan Stages. The Induan Stage was determined to consist of two polarity intervals, where the upper one is reverse (MS5r), and the lower one is normal (MS5n). The Changhsingian Stage is dominated by normal polarity, intercalated with four short-term reverse magnetozones (MS1r to MS4r). Consequently, the PTB and the Wuchiapingian-Changhsingian boundary are clearly located in MS5n and MS1n, respectively. These new magnetostratigraphic results provide a potential reference geomagnetic polarity pattern with which to refine the geomagnetic polarity time scale for the EPME and the Permian-Triassic transition.

更新日期：2021-11-03

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