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Non-hydrothermal saddle dolomite in Upper Cambrian dolostones of Tarim Basin: evidence from C–O–Sr isotopic and in-situ trace elemental studies

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Abstract

The Upper Cambrian dolostones in the Tarim Basin are interpreted to be intensely altered by hydrothermal fluids during the burial diagenesis, and the saddle dolomite filled in fractures is commonly considered as hydrothermal origin. In this study, the saddle dolomite samples from drillhole SNP1 and the Quruqtagh area are sampled, and C-O-Sr isotopic compositions and in-situ trace elemental analyses are employed to check their origin. Replaced dolomites with finely crystal size and coarsely crystal size (RD1 and RD2, respectively), and saddle dolomite cements filled in vugs and fractures (VSD and FSD, respectively) are identified in the Well SNP1. Stylolites crosscut RD1 and RD2 dolomites. KZ-SD is the saddle dolomite in hydrothermal dolostone geobodies in the Quruqtagh area, and shows coarsely crystal size up to 1 cm and wavy extinctions. RD1, RD2 and FSD dolomites show similar δ13CVPDB values of − 1.99 to − 0.73‰, and similar 87Sr/86Sr ratios of 0.70868–0.70905. RD1 and RD2 dolomites show δ18OVPDB values of − 8.74 to − 5.29‰ and of − 10.22 to − 9.20‰, respectively. The δ18OVPDB values of FSD range from − 10.94 to − 10.16‰. RD2, VSD and FSD dolomites show Fe concentrations of 154.76–464.65 ppm, Mn concentrations of 15.74–55.93 ppm and REE concentrations of 1.29–4.61 ppm. The REEY profiles of RD2, VSD and FSD dolomites are characterized by flat to convex patterns with slightly MREE enrichment, and no Ce, Eu and Y anomalies. KZ-SD dolomite shows Fe concentrations of 1081.55–1206.35 ppm, Mn concentrations of 427.25–474.38 ppm and REE concentrations of 12.97–23.64 ppm. The C–O–Sr isotopic compositions and REEY features of RD2, FSD and VSD indicate that saddle dolomites filled in vugs and fractures in the Well SNP1 are formed from redistribution of precursor dolostones, and indicate that RD2 may formed by recrystallization during burial diagenesis.

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Acknowledgements

This research was supported by the Fund of the State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development (No. 33550007-21-ZC0613-0009), the NSFC Basic Research Program on Deep Petroleum Resource Accumulation and Key Engineering Technologies (No. U19B6003), and the National Natural Science Foundation of China (No. 42102191). Special thanks go to Dr. Tan Xiucheng and Dr. Zhao Dongfang of the Laboratory of Carbonate Sedimentary and Diagenetic Geochemistry for collection and analyses of the in-situ trace elemental data.

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  1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 102206, China

    Lu Ziye, Li Yingtao, You Donghua, Chen Qianglu, Xi Binbin & Xu Jin

  2. SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, 214126, China

    Lu Ziye, You Donghua, Chen Qianglu, Xi Binbin & Xu Jin

  3. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500, China

    Lu Ziye, Liu Mingming & Huang Baiwen

  4. Sinopec Petroleum Exploration and Production Research Institute, Beijing, 10083, China

    Li Yingtao

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  1. Lu Ziye
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Ziye, L., Yingtao, L., Mingming, L. et al. Non-hydrothermal saddle dolomite in Upper Cambrian dolostones of Tarim Basin: evidence from C–O–Sr isotopic and in-situ trace elemental studies. Carbonates Evaporites 37, 54 (2022). https://doi.org/10.1007/s13146-022-00799-w

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