Citation: | LIU M M,LU Z Y,LI F,et al.,2025. Evolution of in-situ geochemical records in hydrothermal recrystallization of dolomite: A case study from Upper Cambrian dolostones in the Bachu area, Tarim Basin[J]. Sedimentary Geology and Tethyan Geology,45(1):120−133. DOI: 10.19826/j.cnki.1009-3850.2024.11003 |
The Upper Cambrian dolostones in the Tarim Basin have undergone widely alteration by hydrothermal fluids. In this study, based on petrological and trace element analyses, three types of dolomites were identified in the Upper Cambrian dolostones of Well BT5 in the Bachu area: matrix dolomites (MD), dolomite cements with cathodoluminescence zonation (SD1), and blocky dolomite cements (SD2). SD1 occurs as euhedral crystals, consisting of a core (SD1-1) and a rim (SD1-2). SD1-1 is characterized by cloudy crystal surfaces and bright red luminescence under cathodoluminescence (CL), while SD1-2 displays bright crystal surfaces with irregular bright-dark zoning under CL. And SD2 exhibits wavy extinction and shows bright red under CL. From the host dolostone (MD) to the last generation of dolomite cements (SD1, and SD2's core SD2-1), the Sr concentrations decreased, and the total rare earth element concentrations (ƩREE) as well as light rare earth element enrichment increased. Consequently, SD2-1 is interpreted to be dolomite fillings precipitated from hydrothermal fluids, while SD1 results from hydrothermal recrystallization of MD. This study suggests that the dolomites formed from hydrothermal recrystallization show transitional REE characteristics, which can serve as a useful tool to identify recrystallization process in dolomites.
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