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Sm-Nd dating and in-situ LA-ICP-MS trace element analyses of scheelite from the Longshan Sb-Au deposit, Xiangzhong metallogenic province, south China

Citation

Zhang, Z and Xie, G and Mao, J and Liu, W and Olin, P and Li, Olin, Sm-Nd dating and in-situ LA-ICP-MS trace element analyses of scheelite from the Longshan Sb-Au deposit, Xiangzhong metallogenic province, south China, Minerals, 9, (2) pp. 1-20. ISSN 2075-163X (2019) [Refereed Article]


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Copyright 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

DOI: doi:10.3390/min9020087

Abstract

Longshan is an important Sb-Au ore deposit (3.7 Mt @4.5 wt. % Sb and 4.6 g/t Au) in the Xiangzhong metallogenic province (XZMP), South China. In the present work, trace element composition, Sm-Nd isotope dating, and Sr isotope of scheelite from the Longshan Sb-Au deposit are used to constrain the genesis of the deposit. Based on mineral assemblages and geological characteristics, two types of scheelites can be distinguished (Sch1 and Sch2). Sch1 is granular and cemented by stibnite, while Sch2 is commonly present in stibnite, pyrite, calcite, and quartz veins, indicating that Sch2 is later than Sch1. The Sm-Nd isochron age defined by Sch1 is 210 +/- 2 Ma (MSWD = 1.0, n = 4). This age is interpreted as the age of Sb-Au mineralization and overlaps with the 201-228 Ma granitic rocks in the XZMP. Sch1 exhibits high Sigma REE + Y contents (43.5 to 104 ppm), low Sr values (2687 to 6318 ppm, average of 4018 ppm), and a narrow range of Sr-87/Sr-86 values (0.7209 to 0.7210, average of 0.7209). In contrast, the elevated Sr abundance (4525 to 11,040 ppm, average of 6874 ppm) and wide Sr-87/Sr-86 ratios (0.7209 to 0.7228, average of 0.7214) in Sch2 were possibly caused by fluid-rock interaction mixing with Sr-enriched basement rocks. Sulfides have a narrow range of S-34 values of -1.8 parts per thousand to 3.2 parts per thousand, with an average value of 1.1 parts per thousand (n = 7). Geochronological, geochemical and isotopic data suggest that the Longshan Sb-Au deposit is possible genetically related to the Late Triassic granitic intrusion in the XZMP.

Item Details

Item Type:Refereed Article
Keywords:scheelite, Sm-Nd dating, trace elements, Sb-Au deposit, Longshan
Research Division:Earth Sciences
Research Group:Geology
Research Field:Structural geology and tectonics
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Olin, P (Dr Paul Olin)
ID Code:151969
Year Published:2019
Web of Science® Times Cited:21
Deposited By:CODES ARC
Deposited On:2022-08-09
Last Modified:2022-09-05
Downloads:2 View Download Statistics

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