Depositional environments of the Carboniferous-Permian Taiyuan Formation (southern North China Block) as deduced from trace elements and from carbon and oxygen isotopes

Authors

  • Dawei Lv Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and TechnologyQingdao, Shandong 266590
  • Guangqing Hu School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 23
  • Antonius Johannes van Loon College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong, China http://orcid.org/0000-0002-8906-1728
  • Dun Wu School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026

Keywords:

Taiyuan Formation, North China Block, palaeoenvironmental reconstruction, trace–element analysis

Abstract

Limestone layers are extensively developed in the continental/ocean transitional Taiyuan Formation. This formation accumulated on the southern North China Block. The precise  environmental conditions of the Taiyuan Formation are still controversial. More information about these topics is presented here on the basis of the analysis of trace elements (Mo, V, Cd, Cr, U, Th), which can be used to determine characteristics of the depositional environment, and of carbon and oxygen isotopes (δ13C and δ18O) in limestone samples from the Huainan Coal Basin. Samples were taken for the purpose from cores of all 13 limestone levels, obtained from a coal-exploration borehole (code P2) in the Huainan Coal Basin. It was found that the δ18O values show a decreasing trend, suggesting a gradual rise of the sea level in a warm climate. Three negative shifts of δ13C appear in a lower, a middle and an upper limestone layer, accompanied by relative enrichment of the redox-sensitive elements (Cd, Cr, Mo and V). These three layers are thus deduced to have been deposited in a warm climate with a high sea level and with more terrigenous input than during deposition of the other limestone layers. The redox elements and elemental ratios (V/Cr, Th/U) in the limestones suggest deposition in an oxygen-rich sea with high salinity.

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Published

2021-04-08

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