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JOURNAL OF MECHANICAL ENGINEERING  > 2020  >  38(4): 886-897.
YangHong HOU, ZhiHong KANG, ChenJun ZHAO, XuDong YU, EnBo WANG. Geochemical Characteristics and Geological Significance of the Black Rock Series at the Bottom of the Mufushan Formation in the Lower Cambrian, Lower Yangtze Area[J]. JOURNAL OF MECHANICAL ENGINEERING, 2020, 38(4): 886-897. doi: 10.14027/j.issn.1000-0550.2019.076
Citation: YangHong HOU, ZhiHong KANG, ChenJun ZHAO, XuDong YU, EnBo WANG. Geochemical Characteristics and Geological Significance of the Black Rock Series at the Bottom of the Mufushan Formation in the Lower Cambrian, Lower Yangtze Area[J]. JOURNAL OF MECHANICAL ENGINEERING, 2020, 38(4): 886-897. doi: 10.14027/j.issn.1000-0550.2019.076
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Geochemical Characteristics and Geological Significance of the Black Rock Series at the Bottom of the Mufushan Formation in the Lower Cambrian, Lower Yangtze Area

doi: 10.14027/j.issn.1000-0550.2019.076
Funds:

Petroleum Geological Survey Project of China Geological Survey DD20160183

Investigation of Tectonic Systems and Control Conditions of Oil and Gas and Shale Gas in Key Areas DD20190085

  • Received Date: 15 May 2019
  • Publish Date: 10 Aug 2020
    Abstract
  • In order to investigate the provenance and tectonic setting for the source of the organic⁃rich black rock series from the Lower Cambrian Mufushan Formation in the Lower Yangtze area, samples were collected systematically from the bottom of the Mufushan Formation in the Mufushan section in Nanjing, and geochemical tests and analysis were conducted on the samples. The chemical alteration index (CIA) and Th/U values are important chemical parameters for judging the degree of weathering in the source region. The CIA and Th/U values of the sample indicate that the source rock has experienced weak⁃medium intensity weathering, and the Th/Sc⁃Zr/Sc diagram shows that the black rock series in the area has not experienced sedimentary recirculation. By analyzing the ratio characteristics of the major elements, the distribution patterns of rare earth elements (REE), δEu, (La/Yb)N, La/Th⁃Hf, and the La/Yb⁃∑REE diagrams, we find that the source rock of the Mufushan Formation black rock series is mainly upper crust felsic rocks such as granite and sedimentary rocks rich in felsic minerals, and there are mixed rocks of basic rocks. Considering the source property, geological age, and tectonic evolution process of the South China continent, the granite composition in the source rocks is mainly composed of magmatic rocks that formed during the Neoproterozoic period, and the source area is Ghiangnania. By analyzing the diagrams of K2O+Na2O⁃SiO2, K2O/Na2O⁃SiO2/Al2O3, La⁃Th⁃Sc, Th⁃Co⁃Zr/10, and Th⁃Sc⁃Zr/10, we determine that the tectonic setting of the black rock source area of the Mufushan Formation is the passive continental margin.

     

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