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Geochronologic and isotope geochemical constraints on magmatism and associated W-Mo mineralization of the Jitoushan W-Mo deposit,middle-lower Yangtze Valley

Geochronologic and isotope geochemical constraints on magmat...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Guoxue Song Kezhang Qin Guangming Li Tiebing Liu Jinxiang Li Xianhua Li Zhaoshan Chang Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences CODES ARC Centre of Excellence in Ore Deposits University of Tasmania

The Jitoushan W-Mo ore body is a typical skarn-type deposit with the potential for porphyry Mo mineralization at depth. As it is newly discovered,only a few studies have been conducted on the geochronology and ore genesis of this *** ore district consists of Cambrian to Silurian sedimentary and low-grade metasedimentary strata,intruded by granodiorite, diorite porphyry,granite porphyry,and quartz *** W-Mo ore bodies are hosted in the contact zone between the granodiorite and Cambrian limestone *** the granodiorite near the contact zone,quartz vein type and disseminated sulphide mineralization are well *** Mo-bearing granite porphyry has been traced at depth by *** results reveal two discrete magmatic events at ca.138 and ca.127 Ma in the study *** molybdenite Re-Os isochronal age of 136.6±1.5 million years is consistent with the first magmatic *** zircon Hf isotope(ε(t) =—12.55-3.91),sulphide isotopes( δS = 3.32-5.59‰),and Re content of molybdenite(Re = 6.424-19.07μg) indicate that the ore-forming materials were mainly derived from the deep *** regional tectonic system switched from a Late Jurassic transpressive regime to an earliest Cretaceous extensional regime at ca.145 Ma,and at ca.138 Ma,the Jitoushan W-Mo deposit formed in an extensional setting.

关键词： middle-lower Yangtze Valley Jitoushan W-Mo deposit skarn-type W-Mo deposit sims u-pb age Re-Os isotopic age southern Anhui Province

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Geochronology and Ore-Forming Fluids of the Baizhangyan W-Mo Deposit in the Chizhou Area,Middle-Lower Yangtze Valley,SE-China

Geochronology and Ore-Forming Fluids of the Baizhangyan W-Mo...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Guoxue SONG Kezhang QIN Guangming LI Xianhua LI Wenjun Qu Key Laboratories of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences Key Laboratories of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences National Research Center for Geoanalysis

The Baizhangyan skarn-porphyry type W-Mo deposit is located in a newly defined Mo-W-pb-Zn metallogenic belt,which is in the south of Middle-Lower Yangtze Valley Cu-Fe-Au polymetallic metallogenic belt in SE *** W-Mo orebodies occur mainly within the contact zone between fine-grained granite and Sinian limestone *** are two types of W Mo mineralization:major skarn W-Mo mineralization and minor granite-hosted disseminated Mo mineralization which was traced by drilling at *** molybdenite samples from Mo-bearing ores yield Re-Os dates that overlap within analytical error,with a weighted average age of 134.1±2.2 *** dates are in close agreement with sims u-pb concordant zircon age for fine-grained granite at 133.3±1.3 Ma, indicating that crystallization of the granite and hydrothermal molybdenite formation were coeval and likely *** Baizhangyan W-Mo deposit formed in the Early Cretaceous extensional tectonic setting at the Middle-Lower Yangtze Valley metallogenic belt and the Jaingnan Ancient *** on mineral compositions and crosscutting relationships of veinlets,hydrothermal alteration and mineralization,the ore mineral paragenesis of the Baizhangyan deposit is divided into four stages:skarn stage(Ⅰ),oxide stage(Ⅱ),sulfide stage(Ⅲ),and carbonate stage(IV).Fluid inclusions in garnet,scheelite,quartz and calcite from W-Mo ores are mainly aqueous-rich(L+V) type *** garnet deposition at stage I,the high-temperature fluids gave way to progressively cooler,more dilute fluids associated with tungsten-molybdenite-base metal sulfide deposition(stageⅡand stageⅢ)(162-360℃,2.7-13.2 wt%NaCl equivalent)and carbonate deposition (stageⅣ)(137-190℃,0.9-5 wt%NaCl equiv.).Hydrogen-oxygen isotope data from minerals of different stages suggest that the ore-forming fluids consisted of magmatic water,mixed in various proportions with meteoric *** stageⅠto stageⅣ,there is a systematic decrease in the homogenization tempera

关键词： Baizhangyan fluid evolution Middle-Lower Yangtze Valley mineral paragenesis Re-Os age sims u-pb age W-Mo mineralization

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