In situ LA-ICP-MS U–Pb geochronology and trace element analysis of hydrothermal titanite from the giant zhuxi W (Cu) skarn deposit, south China

Song, Shiwei, Mao, Jingwen, Xie, Guiqing, Chen, Lei, Santosh, M., Chen, Guohua, Rao, Jianfeng, and Ouyang, Yongpeng (2019) In situ LA-ICP-MS U–Pb geochronology and trace element analysis of hydrothermal titanite from the giant zhuxi W (Cu) skarn deposit, south China. Mineralium Deposita, 54 (4). pp. 569-590.

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Abstract

The Zhuxi W (Cu) skarn deposit is the largest W deposit in the Jiangnan porphyry–skarn tungsten belt in South China, and is also among the largest deposit of this type in the world. Titanite is a common mineral in the Zhuxi deposit, and occurs in three textural settings: titanite I associated with retrograde-altered exoskarn with weak mineralization; titanite II in retrograde-altered endoskarn with disseminated Cu ore; and titanite III from altered granite with disseminated W ore. Here, we present LA-ICP-MS U–Pb data on the three types of titanite which show207Pb-corrected weighted mean206Pb/238U agesof148.1±7.4Ma (n = 25, MSWD = 0.22), 148.9 ± 1.5 Ma (n = 28, MSWD = 0.37), and 149.9 ± 1.3 Ma (n = 31, MSWD = 0.28), respectively. These ages are consistent with the previously reported ages of the ore-related granite. The coeval nature of the Wand Cu ores suggests that the Wand Cu ores formed synchronously, and are associated with the granitoids. The Ce and Eu anomalies in the three types of titanite record redox fluctuation during the mineralization process, and suggest variable contamination of the magmatic-hydrothermal system by reduced carbonate wall-rock that contains abundant carbonaceous matter. Our study demonstrates that hydrothermal titanite commonly occurring in reduced-type W skarn deposits has potential for isotopic dating and in constraining the redox conditions for the mineralization process.

Item ID: 62063
Item Type: Article (Research - C1)
ISSN: 1432-1866
Keywords: Jiangnan tungsten belt, LA-ICP-MS U, Pb dating, Redox conditions, Titanite, Zhuxi W (Cu) skarn deposit
Copyright Information: © Springer-Verlag GmbH Germany, part of Springer Nature 2018.
Funders: National Natural Science Foundation of China, Ministry of Land and Resources, China
Projects and Grants: NNSFC grant nos. 41430314, 41573042, Special Fund for Scientific Research in the Public Interest of Ministry of Land and Resources (201411050)
Date Deposited: 22 Apr 2020 00:27
FoR Codes: 37 EARTH SCIENCES > 3705 Geology > 370505 Mineralogy and crystallography @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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