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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

文献类型：期刊论文

作者Song, Guoxue1; Qin, Kezhang1; Li, Guangming1; Li, Xianhua2; Qu, Wenjun3
刊名RESOURCE GEOLOGY
出版日期2013
卷号63期号:1页码:57-71
关键词Baizhangyan fluid evolution Middle-Lower Yangtze Valley mineral paragenesis Re-Os age SIMS U-Pb age W-Mo mineralization
ISSN号1344-1698
DOI10.1111/j.1751-3928.2012.00210.x
文献子类Article
英文摘要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 China. The W-Mo orebodies occur mainly within the contact zone between fine-grained granite and Sinian limestone strata. There 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 depth. Eight 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 Ma. These 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 cogenetic. The Baizhangyan W-Mo deposit formed in the Early Cretaceous extensional tectonic setting at the Middle-Lower Yangtze Valley metallogenic belt and the Jaingnan Ancient Continent. Based 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 inclusions. Following 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 (stage II and stage III) (162-360 degrees C, 2.7-13.2 wt % NaCl equivalent) and carbonate deposition (stage IV) (137-190 degrees C, 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 water. From stage I to stage IV, there is a systematic decrease in the homogenization temperature of the fluid-inclusion fluids and calculated delta O-18 values of the fluids. These suggest that increasing involvement of formation water or meteoric water during the fluid ascent resulted in successive deposition of scheelite and molybdenite at Baizhangyan.
WOS关键词GEOLOGICAL SIGNIFICANCE ; ISOTOPE ; OXYGEN ; RE ; OS ; PORPHYRY ; INCLUSIONS ; EVOLUTION ; COPPER ; PB
WOS研究方向Geology ; Mineralogy
语种英语
WOS记录号WOS:000316915100004
出版者WILEY-BLACKWELL
资助机构Knowledge Innovation Project of the Chinese Academy of Sciences(KZCX1-YW-15-3) ; Knowledge Innovation Project of the Chinese Academy of Sciences(KZCX1-YW-15-3) ; NSFC(41102046) ; NSFC(41102046) ; Knowledge Innovation Project of the Chinese Academy of Sciences(KZCX1-YW-15-3) ; Knowledge Innovation Project of the Chinese Academy of Sciences(KZCX1-YW-15-3) ; NSFC(41102046) ; NSFC(41102046) ; Knowledge Innovation Project of the Chinese Academy of Sciences(KZCX1-YW-15-3) ; Knowledge Innovation Project of the Chinese Academy of Sciences(KZCX1-YW-15-3) ; NSFC(41102046) ; NSFC(41102046) ; Knowledge Innovation Project of the Chinese Academy of Sciences(KZCX1-YW-15-3) ; Knowledge Innovation Project of the Chinese Academy of Sciences(KZCX1-YW-15-3) ; NSFC(41102046) ; NSFC(41102046)
源URL[http://ir.iggcas.ac.cn/handle/132A11/87887]  
专题中国科学院地质与地球物理研究所
通讯作者Qin, Kezhang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Lithospher Evolut, Beijing, Peoples R China
3.Natl Res Ctr Geoanal, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Song, Guoxue,Qin, Kezhang,Li, Guangming,et al. Geochronology and Ore-Forming Fluids of the Baizhangyan W-Mo Deposit in the Chizhou Area, Middle-Lower Yangtze Valley, SE-China[J]. RESOURCE GEOLOGY,2013,63(1):57-71.
APA Song, Guoxue,Qin, Kezhang,Li, Guangming,Li, Xianhua,&Qu, Wenjun.(2013).Geochronology and Ore-Forming Fluids of the Baizhangyan W-Mo Deposit in the Chizhou Area, Middle-Lower Yangtze Valley, SE-China.RESOURCE GEOLOGY,63(1),57-71.
MLA Song, Guoxue,et al."Geochronology and Ore-Forming Fluids of the Baizhangyan W-Mo Deposit in the Chizhou Area, Middle-Lower Yangtze Valley, SE-China".RESOURCE GEOLOGY 63.1(2013):57-71.

入库方式： OAI收割

来源：地质与地球物理研究所

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