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2024 Vol. 45, No. 5
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ZUO Fanfan, ZHANG Yongsheng, SU Kui, GUI Baoling, XING Enyuan, NIU Xinsheng, PENG Yuan, SHANG Wenjun. 2024. Sedimentary Characteristics and Evolution of the Lower Triassic Evaporite and Its Control on the Formation of Potassium Ore in the Puguang Area, Northeastern Sichuan Basin. Acta Geoscientica Sinica, 45(5): 651-664. doi: 10.3975/cagsb.2024.062401
Citation: ZUO Fanfan, ZHANG Yongsheng, SU Kui, GUI Baoling, XING Enyuan, NIU Xinsheng, PENG Yuan, SHANG Wenjun. 2024. Sedimentary Characteristics and Evolution of the Lower Triassic Evaporite and Its Control on the Formation of Potassium Ore in the Puguang Area, Northeastern Sichuan Basin. Acta Geoscientica Sinica, 45(5): 651-664. doi: 10.3975/cagsb.2024.062401
shu

Sedimentary Characteristics and Evolution of the Lower Triassic Evaporite and Its Control on the Formation of Potassium Ore in the Puguang Area, Northeastern Sichuan Basin

  • 1. MNR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;

  • 2. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;

  • 3. MNR SinoProbe Laboratory, Chinese Academy of Geological Sciences, Beijing 100037

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  • Corresponding author: ZHANG Yongsheng  
Received Date:  13 May 2024
Revised Date:  11 June 2024
    Abstract
  • Thick layers of anhydrite and salt are deposited in the Middle and Lower Triassic strata in the Sichuan Basin.The rediscovery and transvaluation of polyhalite associated with salt, which has been called “a new type of polyhalite potassium ore”, has brought widespread attention to this mineral in recent years.However, research on this type of polyhalite has focused mainly on the aspects, such as the mineral development characteristics and genetic types, etc.Studies focusing on high-resolution analyses of the sedimentary characteristics and evolution of the surrounding strata and its control on the formation of polyhalite are rare.Therefore, in this study, microfacies and high-precision sequence stratigraphy analyses were carried out using core data of the continuous coring target interval of well CXD1.Fourteen microfacies types were identified and divided into six microfacies associations representing different sedimentary facies zones with different energy and environmental characteristics ranging from restricted to evaporative platform.On this basis, according to the vertical development of microfacies, stratigraphic thickness and typical diagnostic interfaces, four fourth-order sedimentary sequences and multiple fifth-order cycles within them were defined.The results implied that the primary polyhalite associated with salt in the northeast Sichuan Basin was obviously affected and controlled by sea level fluctuations.Specifically, it developed mainly in the superposition period between the end of regressions in the fourth-order sequences and transgressions of the fifth-order cycles.The evaporative condition in the former provided an important basis for the formation of polyhalite; however, the external seawater replenishment provided by the latter was the necessary condition.
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