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The remaking of the Mengyejing potash deposit in Yunnan, China: Evidence from Rb-Sr isotopic systematics
Lijian Shen;  Chenglin Liu;  Jian-xin Zhao;  Yuexing Feng;  Licheng Wang;  Jiaxi Zhou
2017
Source PublicationOre Geology Reviews
Volume89Pages:876-886
Abstract

The Mengyejing potash deposit (MPD) is the first significant ancient potash deposit ever found in China, and it was considered to have formed during the middle to late Cretaceous. The Sr-87/Sr-86 ratios of potash bulk samples suggest that both bedded and veined potash orebodies of the MPD have been affected by igneous activity resulting from decompression melting of a metasomatically altered, depleted mantle from 16 Ma to present. The Rb-Sr isotopic systematics of the potash bulk samples define several apparent "isochrons" ranging from 0.609 +/- 0.026 to 14.23 +/- 0.63 Ma, with the maximum age being consistent with previous K-Ar ages of the K bearing minerals from the MPD. Such isotopic signatures imply that the MPD may have been affected by multiple-stage fluid flow events since the mid-Miocene, consisting of hydrothermal fluids, continental fresh water, and/or hot spring water. It is very likely that the MPD is still affected by fluid flow-events in modern times. The mineral assemblage of halite + sylvite with minor amounts of camallite was formed due to the recrystallization and diagenetic modification by hydrothermal fluids. Some characteristics of halite photomicrographs and inclusions and the lack of original halite chevron patterns are also supportive of the hypothesis that the deposit has undergone a diagenetic modification and dissolution redrystallization processes.

KeywordRb-sr Systematics Potash Deposit Hydrothermal Fluids Multi-stage Alteration
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8026
Collection矿床地球化学国家重点实验室
Affiliation1.MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
2.Radiogenic Isotope Facility, School of Earth Sciences, The University of Queensland, Brisbane, QLD 4072, Australia
3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
Recommended Citation
GB/T 7714
Lijian Shen;Chenglin Liu;Jian-xin Zhao;Yuexing Feng;Licheng Wang;Jiaxi Zhou. The remaking of the Mengyejing potash deposit in Yunnan, China: Evidence from Rb-Sr isotopic systematics[J]. Ore Geology Reviews,2017,89:876-886.
APA Lijian Shen;Chenglin Liu;Jian-xin Zhao;Yuexing Feng;Licheng Wang;Jiaxi Zhou.(2017).The remaking of the Mengyejing potash deposit in Yunnan, China: Evidence from Rb-Sr isotopic systematics.Ore Geology Reviews,89,876-886.
MLA Lijian Shen;Chenglin Liu;Jian-xin Zhao;Yuexing Feng;Licheng Wang;Jiaxi Zhou."The remaking of the Mengyejing potash deposit in Yunnan, China: Evidence from Rb-Sr isotopic systematics".Ore Geology Reviews 89(2017):876-886.
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