Hirnantian (latest Ordovician) Stratigraphy and Palaeogeography of the Western Yangtze Platform, South China

doi:10.16108/j.issn1006- 7493.2022051

Geological Journal of China Universities ›› 2023, Vol. 29 ›› Issue (2): 298-315.DOI: 10.16108/j.issn1006- 7493.2022051

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Hirnantian (latest Ordovician) Stratigraphy and Palaeogeography of the Western Yangtze Platform, South China

WANG Guangxu^{1, 2}，WEI Xin^1,3，CUI Yunong^{1, 2, 4}，ZHANG Xiaole^1,2，WANG Qian^{1, 2, 4}，ZHAN Renbin^{1, 2, 4}

1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology,
Chinese Academy of Sciences, Nanjing 210008, China;
2. Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China;
3. The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences,
Peking University, Beijing 100871, China;
4. University of Chinese Academy of Sciences, Beijing 100049, China

Online:2023-04-20 Published:2023-04-25

Abstract

Abstract: Hirnantian (latest Ordovician) rocks and fossils have still not been sufficiently documented in the western Yangtze region of South China (today’s southwestern Sichuan and northeastern Yunnan provinces, Southwest China). Compilation of published and new data results in refined Hirnantian stratigraphy and palaeogeography of the region. The lower Hirnantian is typified by the dark-grey cacareous mudstone or argillaceous limestone of the Kuanyinchiao Formation yielding cool-water Transitional Benthic Fauna 1 (TBF 1). The middle Hirnantian strata, however, can be grouped into a near-shore lithofacies belt with distinctive grainstones of the upper Kuanyinchiao Formation yielding warm-water TBF 2, and a more offshore belt characterized by black shales of the basal Lungmachi Formation. A similar facies differentiation occurs in the upper Hirnantian of the region, but the near-shore sediments are in places represented by TBF 3-bearing calcareous siltstones, for which a new lithostratigraphic unit, the Weiba Formation, is proposed. On this basis, refined Hirnantian paleogeographic reconstructions of the western Yangtze Platform are presented.

Key words: stratigraphy, palaeogeograpy, Ordovician, Hirnantian, western Yangtze region

CLC Number:

P535

WANG Guangxu, WEI Xin, CUI Yunong, ZHANG Xiaole, WANG Qian, ZHAN Renbin. Hirnantian (latest Ordovician) Stratigraphy and Palaeogeography of the Western Yangtze Platform, South China[J]. Geological Journal of China Universities, 2023, 29(2): 298-315.

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Hirnantian (latest Ordovician) Stratigraphy and Palaeogeography of the Western Yangtze Platform, South China

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