Oxygen fugacity of ore-bearing porphyries in the Taiyangshan porphyry copper-molybdenum deposit, West Qinling, China and its implications for porphyry-style Cu-Mo mineralization.

被引：0
|
作者：
Gou Z. [1 ,2 ]
Yu H. [1 ,2 ]
Qiu K. [1 ,2 ,3 ]
Wu M. [1 ]
Zhou C. [4 ]
Zhu R. [4 ]
Li J. [1 ]
Wen Y. [1 ]
机构：
[1] School of Earth Sciences and Resources, China University of Geosciences(Beijing), State Key Laboratory of Geological Processes and Mineral Resources, Beijing
[2] State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing
[3] Department of Geology and Geological Engineering, Colorado School of Mines, Golden, 80401, CO
[4] Zhaojin Mining Industry Co., LTD, Zhaoyuan
来源：
Earth Science Frontiers | 2019年 / 26卷 / 05期
关键词：
Oxygen fugacity; Porphyry deposit; Taiyangshan deposit; West Qinling;
D O I：
10.13745/j.esf.sf.2019.9.20
中图分类号：
学科分类号：
摘要：
The Triassic Taiyangshan porphyry copper-molybdenum deposit in Tianshui City, Gansu Province is tectonically located in the West Qinling Orogenic Belt. The bulk of Cu-Mo mineralization is associated with monzonite porphyry and quartz monzonite porphyry, and occurs as stockwork veinlets and disseminated ores in the porphyries and the surrounding Devonian host rocks. Oxygen fugacity is an important physical-chemical parameter in petrology and an obvious controlling factor in magmatic-hydrothermal mineralization. We conducted LA-ICP-MS trace elemental analyses on zircons from the ore-hosting porphyries at Taiyangshan, aiming at calculating the magma oxygen fugacity and constraining its ore formation implications. The average oxygen fugacities were ΔFMQ+3.04 and ΔFMQ+3.15 for ore-bearing monzonite porphyry and quartz monzonite porphyry, respectively, characterized by high f(O2) values. The pre-mineralization quartz diorite porphyry, however, yielded an average oxygen fugacity of ΔFMQ-1.83, a much lower f(O2) value. Combined with our previous petrogenesis results, we therefore proposed that the oxidized magma is associated with enriched mantle, whose addition brought sulfur and copper while increased oxygen fugacity. © 2019, Editorial Office of Earth Science Frontiers. All right reserved.
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页码：243 / 254
页数：11
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