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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2016  >  38(6): 772-778
Zhang Shuai, Yi Haisheng, Xia Guoqing, Liang Dingyong. Mineral and genesis study of authigenic aragonite in sucrosic dolomites from Middle Jurassic Buqu Formation in southern Qiangtang Basin, Tibet[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(6): 772-778. doi: 10.11781/sysydz201606772
Citation: Zhang Shuai, Yi Haisheng, Xia Guoqing, Liang Dingyong. Mineral and genesis study of authigenic aragonite in sucrosic dolomites from Middle Jurassic Buqu Formation in southern Qiangtang Basin, Tibet[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(6): 772-778. doi: 10.11781/sysydz201606772
shu

Mineral and genesis study of authigenic aragonite in sucrosic dolomites from Middle Jurassic Buqu Formation in southern Qiangtang Basin, Tibet

doi: 10.11781/sysydz201606772
  • 1.

    School of Earth Science, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 2. State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Chengdu, Sichuan 610059, China

  • 3. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 4. Hainan Institute of Geological Survey, Haikou, Hainan 570226, China

  • Received Date: 2015-12-10
  • Rev Recd Date: 2016-08-25
  • Publish Date: 2016-11-28
    Abstract
  • Columnar-acicular cement has been discovered in the Middle Jurassic Buqu Formation of Longeni area in the southern Qiangtang Basin of Tibet, distributed in saccharoidal dolomite in dissolution pores filled with bitumen. As demonstrated by microstructure, in situ X-ray diffraction (XRD) and electron microprobe analysis (EMPA), mineralogical investigations have confirmed the emergence of authigenic aragonite. It occurs as bundles and radiating clusters consisting of needle crystals. Major elements show that MgO and SrO have a positive correlation. In situ isotopic analysis indicates that δ13C values range from 3.5‰PDB to 3.98‰PDB and δ18O ranges from -9.98‰PDB to -11.63‰PDB. Aragonite is rarely found in carbonate rocks formed during geological times because of the conversion of aragonite to low-Mg-calcite through neomorphism or dissolution. Oxygen and carbon isotopic composition of aragonite cements in saccharoidal dolomite has greater variability compared with aragonite formed in modern marine or meteoric diagenesis. In the formation process meteoric water leaching has less influence and a negative excursion of δ18O is mainly controlled by geothermal gradient during burial. The reservoir diagenetic sequence shows that aragonite cements formed after burial dolomitization. Authigenic mineral precipitates with organic acid dissolution, and hydrocarbon filling has largely inhibited the conversion of aragonite to calcite. The comprehensive analysis suggests that aragonite cements were precipitated from a dissolution-reprecipitation process of carbonate minerals during late diagenesis. Hydrocarbon filling played an important role controlling the preservation of aragonite cements.

     

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