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Timing of multiple magma events and duration of the hydrothermal system at the Yu'erya gold deposit, eastern Hebei Province, China: Constraints from U-Pb and Ar-Ar dating

Zhang, T, Zhang, D, Danyushevsky, LV ORCID: 0000-0003-4050-6850, Wu, M, Koffi Alexis, N, Liao, Y and Zhang, J 2020 , 'Timing of multiple magma events and duration of the hydrothermal system at the Yu'erya gold deposit, eastern Hebei Province, China: Constraints from U-Pb and Ar-Ar dating' , Ore Geology Reviews, vol. 127 , pp. 1-16 , doi: 10.1016/j.oregeorev.2020.103804.

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Abstract

The Yu’erya deposit is a large granite–hosted gold deposit in the eastern Hebei Province classified as an intrusion–related gold system. The Yu’erya complex contains the causative intrusion which was the source of hydrothermal metal-bearing fluids. This composite granite complex contains miarolitic pegmatite(–like) cavities and pegmatite veins. A combination of detailed field observations and U–Pb dating by SHRIMP and LA–ICP–MS is used to document multiple magmatic events which occurred at 210–220, 175–173, 171–170, 167–166 and ∼161 Ma formed the Yu’erya granite complex. The initiation of the hydrothermal system, as determined via Ar–Ar dating, is closely related to the exsolution of a magmatic volatile phase from the G1 granite at ca.176 Ma. The hydrothermal system operated for ∼16 my (176–160 Ma) and produced multiple mineralising events (∼176, 172–168 and 162–160 Ma) linked to emplacement of repeated magma pulses from 175 Ma to 161 Ma. Our results suggest that multiple magmatic–hydrothermal events over a time period of several million years may be a fundamental factor responsible for the enrichment process during formation of intrusion-related gold deposits and thus may be a requirement for forming economic orebodies.

Item Type: Article
Authors/Creators:Zhang, T and Zhang, D and Danyushevsky, LV and Wu, M and Koffi Alexis, N and Liao, Y and Zhang, J
Keywords: geochronology, intrusion–related gold deposit, multiple magmatic–hydrothermal events, Yu’erya gold deposit
Journal or Publication Title: Ore Geology Reviews
Publisher: Elsevier Science Bv
ISSN: 0169-1368
DOI / ID Number: 10.1016/j.oregeorev.2020.103804
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© 2020 Elsevier B.V. All rights reserved.

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