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Chinese Science Bulletin

, Volume 58, Issue 23, pp 2877–2882 | Cite as

In situ stable isotopic constraints on dolomitizing fluids for the hydrothermally-originated saddle dolomites at Keping, Tarim Basin

  • ShaoFeng Dong
  • DaiZhao Chen
  • HaiRuo Qing
  • MaoSheng Jiang
  • XiQiang Zhou
Open Access
Article Geology
First Online:
Received:
Accepted:

Abstract

Detailed characterization of diagenetic fluid behaviour and evolution is commonly hindered by shortage of appropriate and economic methods to carry out in situ analysis in the tiny diagenetic mineral crystals. Using micromill sampling method, this study presents in situ stable isotopic data for the growth zones of saddle dolomite crystals in the hydrothermally-altered dolostones of Upper Cambrian (Furongian) at Keping, Tarim Basin, NW China. These data show minor and large variations in δ 13C (−0.7‰ to −1.5‰ VPDB) and δ 18O (−8.3‰ to −13.8‰ VPDB), respectively, from the cores to outer rims of the dolomite crystals and suggest that saddle dolomites precipitated from dolomitizing fluids with similar carbon sources but oscillatory temperatures during different formation stages. This scenario is confirmed by microthermometry of fluid inclusions within the growth zones of dolomite crystals. This study indicates that in situ isotope analysis could provide more detailed information related to the source and pathway of dolomitizing fluids, facilitating better characterization of dolomitizing fluids and processes.

Keywords

Tarim Basin Upper Cambrian saddle dolomite micromill sampling in situ stable isotope analysis fluid inclusion microthermometry petrography 
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Copyright information

© The Author(s) 2013

Authors and Affiliations

  • ShaoFeng Dong
    • 1
    • 2
  • DaiZhao Chen
    • 1
  • HaiRuo Qing
    • 3
  • MaoSheng Jiang
    • 1
  • XiQiang Zhou
    • 1
    • 2
  1. 1.Key Laboratory of Petroleum Resources Research, Institute of Geology and GeophysicsChinese Academy of SciencesBeijingChina
  2. 2.Graduate University of Chinese Academy of SciencesBeijingChina
  3. 3.Department of GeologyUniversity of ReginaReginaCanada

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