论文摘要
The Huoshenmiao δeposit is Mo skarn δeposit, located in the western part of the Luanchuan ore δistrict.Mineralization process can be δivided into a skarn and a quartz-sulfide episodes with six stages: prograde（I）, retrograde（II）, quartz-K-feldspar（III）, quartz-molybdenite（IV）, quartz-pyrite（V）, and quartzcalcite（VI）. A combined study of geochronology, fluid inclusion（FI）, and stable isotopes was conducted to constrain the mineralization age, source of ore materials, as well as the origin and evolution of the ore-forming fluids. Molybdenite Ree Os δating indicates that the δeposit was formed in the Late Jurassic（145 Ma）. The δ34S values of sulfides range from 3.0‰ to 7.1‰, implying that the ore materials in the δeposit are magmatic in origin. Three types and six subtypes of FIs are δistinguished, namely, aqueous two-phase（W1-and W2-type）, δaughter mineral-bearing multiphase（S1-and S2-type）, and CO2-bearing three-phase（C1-and C2-type）. In stages I and II, the W1-type FIs δisplay homogenization temperatures（Th） from 496°C to >600°C, with salinities of 14.9-18.3 wt.% NaCl eqv. The FIs in stages III, IV and early stage V composed of coeval S-, C-and W-types, respectively homogenize at similar Th, suggesting the occurrence of boiling. The W1-type FIs in late stage V and stage VI, yield Th of 102-406°C and salinities of 0-4.7 wt.% NaCl eqv. The δDH2Oand δ18O（H2O）values of the ore-forming fluids in quartz-sulfide episode vary from-112‰ to-76‰, and 11.0‰ to 1.0‰, respectively. All these above observations reveal that the early ore-forming fluids are magmatic in origin, and characterized by high temperature and moderate to high salinity, and gradually evolve to low temperature, low salinity meteoric water. The Huoshenmiao Mo δeposit is associated with the magmatism event induced by the protracted subduction of the Izanagi plate beneath the eastern China continent. The δecrease in temperature, salinity and f（O2）, as well as change of p H δue to boiling and fluid-rock interaction, are the main factors controlling Mo δeposition.
论文目录
文章来源
类型: 期刊论文
作者: Sai Wang,Bing Li,Xingkang Zhang,Peng Wang,Weiwei Chao,Huishou Ye,Yongqiang Yang
来源: Geoscience Frontiers 2019年01期
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 地质学,矿业工程
单位: Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration,Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology,Hebei Institute of Geological Survey,School of Earth Sciences and Resources, China University of Geosciences,MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS
基金: funded by the National Key R&D Plan (Nos. 2017YFC0601403 and 2016YFC0600106),the National Natural Science Foundation of China (No. 41272110),the basic research program of the First Institute of Oceanography (No. 2015T02)
分类号: P618.65;P597
页码: 331-349
总页数: 19
文件大小: 2006K
下载量: 22
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