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TIAN Kangzhi, JI Changjun, YI Haisheng, TAN Mei, JIN Feng, FAN Lishun. 2019. Origin of grained dolomite from the Buqu Formation of Zaring area in southern Qiangtang depression[J]. Geology in China, 46(2): 398-406. doi: 10.12029/gc20190216
Citation: TIAN Kangzhi, JI Changjun, YI Haisheng, TAN Mei, JIN Feng, FAN Lishun. 2019. Origin of grained dolomite from the Buqu Formation of Zaring area in southern Qiangtang depression[J]. Geology in China, 46(2): 398-406. doi: 10.12029/gc20190216
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Origin of grained dolomite from the Buqu Formation of Zaring area in southern Qiangtang depression

  • 1.

    Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China

  • 2.

    Institute of Geomechanics, Chinese Academy of Geological Sciences. Beijing 100081, China

  • 3.

    Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Natural Resources, Beijing 100081, China

  • 4.

    Key Lab of Shale Oil and Gas Geological Survey, Chinese Academy of Geological Sciences, Beijing 100081, China

  • 5.

    Chongqing Natural Museum, Chongqing 400700, China

  • 6.

    Gansu Kantanzhe Geology and Mineral Resources Co., Ltd., Lanzhou 730000, Gansu, China

    • Fund Project: Supported by China Geological Survey Program (No. 121201010000150014)
More Information
  • Author Bio: TIAN Kangzhi, male, born in 1992, master candidate, engages in the research on sedimentology. E-mail:tiankangzhiwd@126.com
  • Corresponding author: JI Changjun, male, born in 1986, assistant researcher, engages in depositional geology and oil and gas geology research. E-mail:286648795@qq.com 
Received Date:  06 September 2017
Revised Date:  14 March 2018
Publish Date:  25 April 2019
    Abstract

  • The genetic mechanism of dolomite of the Middle Jurassic Buqu Formation in the Qiangtang depression was studied by using microscopy, fluid Inclusion data, and carbon and oxygen isotope analysis. The results show that the dolomites in the study area can be divided into fine-powdery dolomite, medium dolomite and coarse dolomite according to grain size. Dolomite generally has a fogged center and clear margin structure, in the cracks near the extensive development of grained saddle dolomite. Fluid inclusions in the dolomite have homogenization temperature ranging between 150.2 and 216.0℃ and average salinity of 24.5%NaCl, much higher than the homogenization temperature and salinity of fluid inclusions in calcite, indicating a high temperature and high salinity diagenetic environment. The isotopic analysis shows that δ13CPDB values vary from-0.01‰ to 3.43‰, and δ18OPDB values vary from-11.17‰ to -7.68‰; according to the dolomite-fluid oxygen isotope fractionation equation, the δ18OSMOW values of dolomitization fluid are in the range of 4.82‰-12.85‰, It is believed that the matrix dolomite and the saddle dolomite that are filled in the pores in the study area are the products of host limestone altered by the high salinity fluid heated by the magma activity in a close environment, while the high salinity fluid due to the consumption of magnesium ions led to over-saturation of fluid calcite and then to the precipitation if high-temperature calcite. Therefore, hydrothermal activity was very significant for the development of dolomite of the Middle Jurassic Buqu Formation in the study area.

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