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Ahead of Print Abstract
DOI:10.1306/09172524080
Deep hydrothermal dolomitization in a superimposed basin that experienced multiple tectonic-thermal events
Zhiqian Gao12 , Duan Wei12 , Kaikai Li12 , Hairuo Qing3 , Shoutao Peng4 , Jingbin Wang4 , Ruisi Li12 , and Tailiang Fan12
1 School of Energy Resource, China University of Geosciences (Beijing), Beijing, China
2 Key laboratory of marine reservoir evolution and hydrocarbon enrichment mechanism, Ministry of Education, China University of Geosciences (Beijing), Beijing, China
3 Department of Geology, University of Regina, Regina, SK, Canada
4 Petroleum Exploration and Production Research Institute, Sinopec, Beijing, China
Ahead of Print Abstract
Hydrothermal dolomite, due to its significant impact on reservoir quality and complex mineralization, has received significant attention for many decades. Regional studies in many superimposed basins have produced extensive petrographic and geochemical datasets, and, together with recent technological advancements, provide a robust framework for comparative analysis. Compilation of published data supplemented by new petrographic, rare earth element, and U-Pb dating data enabled a meta-analysis of the geodynamic setting, fluid sources, paleohydrologic models, and growth processes of the interpreted hydrothermal dolomite. This study confirms that the interpreted hydrothermal dolomite in the Tarim Basin primarily originated from deep-sourced hydrothermal fluids (sensu Machel and Lonnee, 2002) that underwent extensive water-rock reaction. However, variations in hydrothermal fluids are noted across different periods and regions. The δ18O values of saddle dolomites suggest an upward, unidirectional, pulsating migration of fluids (rather than large-scale thermal fluid convection), which led to hydrothermal modification recrystallization. This study is the first to document that parts of the interpreted hydrothermal dolomites in the Tarim Basin formed during the Late Devonian-Permian. nicrometer-scale growth zones in hydrothermal dolomites correspond to changes in fluid chemistry, which may be related to rapid precipitation under conditions of limited water-rock reaction between episodic pulses of hydrothermal fluid and the host rock. Hydrothermal dolomitization can occur at various stages of superimposed basins, not just shortly after deposition in an extensional tectonic setting. Under favorable geodynamic conditions, the distribution of hydrothermal dolomite over time and space was primarily controlled by fault movements.
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