Sm-Nd isotope system dating of scheelite and fluorite from Changtian W (Sn) deposit in the northern Laojunshan ore district, SE Yunnan Province,China: Constraints on the mineralizing age

被引：0
|
作者：
Du S. [1 ]
Wen H. [2 ,3 ]
Zhang J. [4 ]
Yang G. [5 ]
机构：
[1] School of Mining Engineering, Guizhou Institute of Technology, Guizhou, Guiyang
[2] School of Earth Sciences and Resources, Chang'An University, Shaanxi, Xi'an
[3] College of Earth and Planetary Sciences», University of Chinese Academy of Sciences, Beijing
[4] College of Geoscience and Technology, South-west Petroleum University, Sichuan, Chengdu
[5] Faculty of hand Resource Engineering, Kunming University of Science and TechnologyKunming, Yunnan
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 10期
关键词：
Changtian W(Sn) deposit; fluorite; Laojunshan ore district; scheelite; Sm-Nd isotope system dating;
D O I：
10.19762/j.cnki.dizhixuebao.2022181
中图分类号：
学科分类号：
摘要：
The Laojunshan ore district is an essential part of the W-Sn metallogenic belt in SE Yunnan Province, China. A series of large and super-large deposits such as the Dulong, Nanyangtian and Xinzhai Sn-W polymetallic deposits arc distributed around the Laojunshan complex granite of Yanshanian. The Sn-W polymetals may have had multistage mineralization (c. g., Yanshan, Indosinian and Caledonian) because of complex geological history in the Laojunshan ore district. The Sn-W mineralization found in this ore district is mainly distributed in southern and eastern Laojunshan granite body, while northern deposits arc relatively less studied. Especially in metallogenic chronology, most deposits still lack accurate isotopic chronology data, which limits the understanding of Sn-W polymetallic mineralization and in-depth geological exploration in this area. Changtian is a typical W (Sn) polymetallic deposit in northern Laojunshan granite. Caledonian and Yanshanian granites arc distributed in the Changtian ore district. Due to the lack of chronology and geochemistry study, the understanding of W (Sn) mineralization is not based on actual geological and geochemical evidence. It is difficult to establish a reasonable metallogenic model, which restricts the in-depth geological exploration in the Changtian W (Sn) deposit. This study provides a high-precision Sm-Nd isotopic dating for scheelite and fluorite separated from the tungsten ore with two isochron ages of (97 Ma, scheelite) and (79 Ma, fluorite). These results showed that the Changtian W (Sn) deposit formed in the Yanshanian, and tungsten mineralization is closely related to the Laojunshan granite, but has little relation with the Nanwenhe granite. This study has enriched Sn-W mineralization of the Laojunshan granite of late Yanshanian and its scope of influence, as well as providing important geochronology data to further improve the geochronology framework of the Laojunshan ore district. © 2023 Geological Society of China. All rights reserved.
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页码：3347 / 3362
页数：15
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