Petrographic, Mineralogical and Geochemical Constraints on the Origin of Regional-Scale Dolomitization: A Case Study of the Cambrian–Lower Ordovician Dolomites in the Bachu Area, Central Tarim Basin, China

Miao Li; Yushuang Zhou; Yongqiang Zhao; Juan Xu; Fei Wu; Feng Geng

doi:10.1007/s12583-023-1838-y

Volume 37 Issue 1

Feb 2026

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Journal of Earth Science > 2026 > 37(1): 23-35.

Miao Li, Yushuang Zhou, Yongqiang Zhao, Juan Xu, Fei Wu, Feng Geng. Petrographic, Mineralogical and Geochemical Constraints on the Origin of Regional-Scale Dolomitization: A Case Study of the Cambrian–Lower Ordovician Dolomites in the Bachu Area, Central Tarim Basin, China. Journal of Earth Science, 2026, 37(1): 23-35. doi: 10.1007/s12583-023-1838-y

Citation:

Miao Li, Yushuang Zhou, Yongqiang Zhao, Juan Xu, Fei Wu, Feng Geng. Petrographic, Mineralogical and Geochemical Constraints on the Origin of Regional-Scale Dolomitization: A Case Study of the Cambrian–Lower Ordovician Dolomites in the Bachu Area, Central Tarim Basin, China. Journal of Earth Science, 2026, 37(1): 23-35. doi: 10.1007/s12583-023-1838-y

Citation:

Miao Li, Yushuang Zhou, Yongqiang Zhao, Juan Xu, Fei Wu, Feng Geng. Petrographic, Mineralogical and Geochemical Constraints on the Origin of Regional-Scale Dolomitization: A Case Study of the Cambrian–Lower Ordovician Dolomites in the Bachu Area, Central Tarim Basin, China. Journal of Earth Science, 2026, 37(1): 23-35. doi: 10.1007/s12583-023-1838-y

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Petrographic, Mineralogical and Geochemical Constraints on the Origin of Regional-Scale Dolomitization: A Case Study of the Cambrian–Lower Ordovician Dolomites in the Bachu Area, Central Tarim Basin, China

doi: 10.1007/s12583-023-1838-y

Miao Li^{1, 2
,
,
,},
Yushuang Zhou¹,
Yongqiang Zhao¹,
Juan Xu³,
Fei Wu^4
,,
Feng Geng⁵

1.
Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi 214126, China
2.
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi 214126, China
3.
CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
4.
School of Earth Sciences, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan), Wuhan 430074, China
5.
Exploration and Development Research Institute of Northwest Oilfield Company, SINOPEC, Urumqi 830011, China

More Information

Corresponding author: Miao Li, lmustc07.syky@sinopec.com; miaoligeo07@163.com
Received Date: 25 Oct 2022
Accepted Date: 10 Apr 2023

Available Online: 13 Feb 2026

Issue Publish Date: 28 Feb 2026

Abstract

Abstract

The Cambrian and Lower Ordovician strata of the Bachu area in central Tarim Basin are characterized by extensively dolomitized, which have significant potential for favourable hydrocarbon reservoirs. The study herein combined petrographic, mineralogical and geochemical analyses to investigate the formation environments of these dolomite units and utilized Mg isotopic profiles to constrain the changes in the fluid flow trajectory. Positive excursions of δ¹⁸O and upward-increasing δ²⁶Mg profiles were observed in samples of the Wusonger formation (Є₁w), which may result from evaporation. Moreover, based on high ⁸⁷Sr/⁸⁶Sr ratios, high total REE concentrations and the occurrence of specific minerals, including quartz, barite, gypsum and pyrite, we interpret an evaporitic near-surface origin for the Є₁w dolomites. Samples of the Xiaoerblak Formation (Є₁x) are the product of seepage-reflux dolomitization, suggested by upward-decreasing δ²⁶Mg profiles and relatively lower ⁸⁷Sr/⁸⁶Sr ratios than the Є₁w samples. The overlapping isotope (δ¹⁸O, δ¹³C and ⁸⁷Sr/⁸⁶Sr) values between samples of the Shayilik (Є₂s) and Awatagh (Є₂a) Formation, in addition to the petrography evidence and Mg isotope variations, suggest that the formation of these dolomites were due to the shallow-burial dolomitization. The occurrence of the Xiaqiulitagh (Є₃ql) and Penglaiba (O₁p) dolomites along stylolites, together with their large crystals with opaque cores and clear rims and vertically constant δ²⁶Mg profiles, indicate that their formation may be related to pressure dissolution by mechanical compaction during deep-burial dolomitization. Therefore, the assembling of multiple petrographic, mineralogical and geochemical methods can shed light on the complicated generation processes of regional-scale dolomite within Tarim Basin or elsewhere.
- genesis of dolomites,
- isotopes,
- magnesium isotope,
- Tarim Basin,
- Cambrian–Lower Ordovician

Electronic Supplementary Materials: Supplementary materials (Table S1, Figures S1–S2) are available in the online version of this article at https://doi.org/10.1007/s12583-023-1838-y.
Conflict of Interest
The authors declare that they have no conflict of interest.

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