Abstract
Detailed petrographic, geochemical (O-C-Sr isotopes) and fluid inclusion studies of the deeply buried Cambrian carbonates in the West-central Tarim Basin revealed three types of crystalline dolomites (fine-crystalline, nonplanar-a(s), dolomite (RD1), fine- to medium-crystalline, planar-e(s) dolomite (RD2), and medium- to coarse-crystalline, nonplanar-a dolomite (RD3)), medium- to coarse-crystalline, nonplanar-a saddle dolomite cement (CD) and early and later-stage calcite cement. The occurrence of RD1 along low-amplitude stylolites points to link with pressure dissolution by which minor Mg ions were likely released for replacive dolomitization during early- to intermediate-burial seawater dolomitization. The increasing crystal sizes of RD2 and RD3 with irregular overgrowth rims suggests intense recrystallization and replacement upon the RD1 or remaining precursor limestones by dolomitizing fluids during late intermediate burial dolomitization. The overlap of δ18O, δ13C and 87Sr/86Sr values of RD1-RD3 and CD dolomite with coeval seawater values, suggests that the principal dolomitizing fluids that precipitated these dolomites was connate (Cambrian) seawater preserved in the host limestones/dolomites. Their high 87Sr/86Sr ratios suggest influx of radiogenic strontium into the Cambrian seawater. Two regimes of fluid flow are recognized in the study area: firstly, influx of magnesium-rich higher-temperature basinal brines along deep-seated faults/fractures, resulting in cementation by CD dolomite. Secondly, the incursion of meteoric waters, mixing with ascending higher-temperature basinal brines, and an increase in Ca2+/Mg2+ ratio in the fluids probably results in the precipitation of calcite cement in vugs and fractures.
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Acknowledgments
This study was funded by the National Natural Science Foundation Project of China (Nos. 41372126 and 41772103), National Science and Technology Major Project of China (No. 2016ZX05007-002) and Natural Science Foundation Innovation Group Program of Hubei Province (No. 2015CFA024).The authors thank Dr. Qingjie Deng and Dr. Rong Li for their constructive suggestions during the preparation of the manuscript. We greatly appreciate the valuable comments and suggestions of the Editors and reviewers of the Journal of Earth Science, which helped us, improve the quality of this paper. The final publication is available at Springer via https://doi.org/10.1007/s12583-017-0954-y.
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Ngia, N.R., Hu, M., Gao, D. et al. Application of Stable Strontium Isotope Geochemistry and Fluid Inclusion Microthermometry to Studies of Dolomitization of the Deeply Buried Cambrian Carbonate Successions in West-Central Tarim Basin, NW China. J. Earth Sci. 30, 176–193 (2019). https://doi.org/10.1007/s12583-017-0954-y
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DOI: https://doi.org/10.1007/s12583-017-0954-y