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U-Pb, Re-Os and Ar-Ar dating of the Linghou polymetallic deposit, Southeastern China: implications for metallogenesis of the Qingzhou-Hangzhou metallogenic belt

Citation

Tang, Y and Xie, Y and Liu, L and Lan, T and Yang, J and Meffer, S and Yin, R and Liang, S and Zhou, L, U-Pb, Re-Os and Ar-Ar dating of the Linghou polymetallic deposit, Southeastern China: implications for metallogenesis of the Qingzhou-Hangzhou metallogenic belt, Journal of Asian Earth Sciences, 137 pp. 163-179. ISSN 1367-9120 (2017) [Refereed Article]

Copyright Statement

Copyright 2017 Elsevier Ltd. All rights reserved.

DOI: doi:10.1016/j.jseaes.2017.02.016

Abstract

The Qingzhou–Hangzhou metallogenic belt (QHMB) in Southeastern China has gained increasingly attention in recent years. However, due to the lack of reliable ages on intrusions and associated deposits in this belt, the tectonic setting and metallogenesis of the QHMB have not been well understood. The Linghou polymetallic deposit in northwestern Zhejiang Province is one of the typical deposits of the QHMB. According to the field relationships, this deposit consists of the early Cu–Au–Ag and the late Pb–Zn–Cu mineralization stages. Molybdenite samples with a mineral assemblage of molybdenite–chalcopyrite–pyrite ± quartz are collected from the copper mining tunnel near the Cu–Au–Ag ore bodies. Six molybdenite samples give the Re–Os model ages varying from 160.3 to 164.1 Ma and yield a mean age of 162.2 ± 1.4 Ma for the Cu–Au–Ag mineralization. Hydrothermal muscovite gives a well-defined Ar–Ar isochron age of 160.2 ± 1.1 Ma for the Pb–Zn–Cu mineralization. Three phases of granodioritic porphyry have been distinguished in this deposit, and LA–ICP–MS zircon U–Pb dating shows that they have formed at 158.8 ± 2.4 Ma, 158.3 ± 1.9 Ma and 160.6 ± 2.1 Ma, comparable to the obtained ages of the Cu–Au–Ag and Pb–Zn–Cu mineralization. Therefore, these intrusive rocks have a close temporal and spatial relationship with the Cu–Au–Ag and Pb–Zn–Cu ore bodies. The presences of skarn minerals (e.g., garnet) and vein-type ores, together with the previous fluid inclusion and H–O–C–S–Pb isotopic data, clearly indicate that the Cu–Au–Ag and Pb–Zn–Cu mineralization are genetically related to these granodiorite porphyries. This conclusion excludes the possibility that this deposit is of "SEDEX" type and formed in a sag basin of continental rifts setting as previously proposed. Instead, it is proposed that the Linghou polymetallic and other similar deposits in the QHMB, such as the 150–160 Ma Yongping porphyry-skarn Cu–Mo, Dongxiang porphyry? Cu, Shuikoushan/Kangjiawang skarn Pb–Zn, Fozichong skarn Pb–Zn and Dabaoshan porphyry-skarn deposits are of magmatic-hydrothermal origin and likely formed in a subduction-related setting. This work provides new insight that these intrusion-related deposits (e.g., porphyry and skarn types) of middle to late Jurassic age can be the most important targets for exploration in the QHMB.

Item Details

Item Type:Refereed Article
Keywords:Qinzhou-Hangzhou metallogenic belt (QHMB), Zircon U-Pb dating, molybdenite Re-Os dating, hydrothermal muscovite Ar-Ar dating, ore genesis
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
UTAS Author:Meffer, S (Dr Sebastien Meffre)
ID Code:125566
Year Published:2017
Web of Science® Times Cited:4
Deposited By:CODES ARC
Deposited On:2018-04-23
Last Modified:2018-05-18
Downloads:0

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