自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 6    June 2020

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Provenance and salt structures of gypsum formations in Pb-Zn ore-bearing Lanping basin, Southwest China
ZHANG Zhi-bo(张治波)1, 2, ZHU Zhi-jun(朱志军)1, LI Huan(李欢)3, JIANG Wei-cheng(蒋维诚)4,WANG Wen-feng(王文峰)1, XU Ying(徐颖)1, LI Li-rong(李丽荣)1

1. College of Earth Sciences, East China University of Technology, Nanchang 330013, China;
2. School of Resources and Geosciences, China University of Mining and Technology,
Xuzhou 221116, China;
3. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education; School of Geosciences and Info-Physics, Central South University,Changsha 410083, China;
4. School of Earth Resources, China University of Geosciences, Wuhan 430074, China

Abstract:Large-scale gypsum rocks associated with world-class Pb-Zn ore formations are widely distributed in the Lanping Basin, Sowthwest China. Geochemical studies alongside field investigations were conducted in this study to determine the source and evolutionary processes of the gypsum rocks in this area. The gypsum sequences in the Lanping Basin developed in two formations: the Triassic Sanhedong Formation and the Paleogene Yunlong Formation. The gypsum hosted in the former displays a primary thick-banded structure with δ34SV-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 origin. In 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) and δ34SV-CDT values (9.6‰-17‰), thus indicating a marine source but with the input of continental materials. The initial layered salt formations were formed by chemical deposition in a basin and were later intensely deformed by collisional orogeny during the Himalaya period. As a result, variable salt structures were formed. We hereby propose an evolutionary model to elucidate the genesis of the gypsum formations in the Lanping Basin.

 

Key words: Lanping basin; gypsum; marine sediment; Sr–S isotopes; salt structure

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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