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Provenance and salt structures of gypsum formations in Pb-Zn ore-bearing Lanping basin,southwest China

Journal of Central south University 2020年第6期27卷 1828-1845页

作者： ZHANG Zhi-bo ZHU Zhi-jun LI Huan JIANG Wei-cheng WANG Wen-feng XU Ying LI Li-rong College of Earth sciences East China University of TechnologyNanchang 330013China school of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-PhysicsCentral South UniversityChangsha 410083China school of Earth Resources China University of GeosciencesWuhan 430074China

Large-scale gypsum rocks associated with world-class Pb-Zn ore formations are widely distributed in the Lanping Basin,sowthwest *** studies alongside field investigations were conducted in this study to determine the source and evolutionary processes of the gypsum rocks in this *** gypsum sequences in the Lanping Basin developed in two formations:the Triassic sanhedong Formation and the Paleogene Yunlong *** gypsum hosted in the former displays a primary thick-banded structure withδ34sV-CDT values in the range of 14.5‰−14.8‰.Combined with the 87sr/86sr values(0.707737−0.707783)of limestone,it can be suggested that the sanhedong Formation is of marine *** contrast,the gypsum from the Paleogene Yunlong Formation is characterized by the dome,bead and diapiric salt structures,wider range of both 87sr/86sr(0.707695−0.708629)andδ34sV-CDT values(9.6‰−17‰),thus indicating a marine source but with the input of continental *** initial layered salt formations were formed by chemical deposition in a basin and were later intensely deformed by collisional orogeny during the Himalaya *** a result,variable salt structures were *** hereby propose an evolutionary model to elucidate the genesis of the gypsum formations in the Lanping Basin.

关键词： Lanping basin gypsum marine sediment sr–s isotopes salt structure

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