Abstract
Based on petrology, mineralogy, carbon and oxygen isotope composition, trace element composition, geochemical characteristics of carbonate rocks are systematically analyzed in the saline lacustrine basin environment in the Qaidam Basin, northwestern China. The results show that: (1) The carbon and oxygen isotopic compositions show carbonate rocks were deposited between open lake and closed lake environment; (2) the Sr/Ba ratio is greater than 1 with an average of 2.01; the Sr/Cu ratio is greater than 5 with an average of 109.04; the U/Th average value ratio is less than 1 with an average of 0.62. These data indicated the carbonate rocks deposited in an salinization, drought, and reducing lacustrine environments; (3) ΣREE values range from 39.41 to 162.67 ppm with an average of 87.67 ppm, and negative anomaly of Eu occurs in REE distribution patterns; and (4) lithologies of carbonate rocks are mainly composed of dark gray or black carbonates, commonly associated with salts deposition due to different lacustrine facies.
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Acknowledgements
This study is financially supported by National Major Project of science and technology in developing great oil&gas field and coal bed gas (2016ZX05007-006), Study on water-cut control and production stabilization in the old gasfields and efficient development in new gasfields, in Qaidam Basin (2016E-0106GF). The authors also thank the anonymous reviewers for their constructive comments and the editorial staff for their diligent work.
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Chen, Q., Zhang, D., Wang, J. et al. Geochemical characteristics of carbonate rocks in a salinized lacustrine basin: a case study from Oligocene formation in the Qaidam Basin, northwestern China. Carbonates Evaporites 35, 40 (2020). https://doi.org/10.1007/s13146-020-00551-2
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DOI: https://doi.org/10.1007/s13146-020-00551-2