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IN SITU LA-ICP-MS U-Pb GEOCHRONOLOGY AND TRACE ELEMENT ANALYSIS OF HYDROTHERMAL TITANITE FROM THE JIEPAI W-Cu DEPOSIT, SOUTH CHINA: IMPLICATIONS FOR W MINERALIZATION

文献类型：期刊论文

作者Li, Jia Dai1,2,3; Li, Xiao Feng1,2,3; Xiao, Rong4
刊名CANADIAN MINERALOGIST
出版日期2020
卷号58期号:1页码:45-69
关键词titanite U-Pb geochronology trace elements Silurian W mineralization South China
ISSN号0008-4476
DOI10.3749/canmin.1900027
英文摘要Titanite is associated with scheelite in altered biotite granite, clinopyroxene skarn, actinolite skarn, clinozoisite skarn, and quartz veins in the Jiepai W-Cu deposit, South China. Textural and geochemical characteristics indicate a hydrothermal origin for the titanite. There is compositional variability with respect to the rare earth element (REE) and high field strength element (HFSE) components in titanite from the different rock types. Interstitial titanite from the clinopyroxene (-garnet-vesuvianite) skarn displays low to moderate concentrations of REE (1212-1693 ppm), Nb (1337-1911 ppm), Ta (16-24 ppm), and W (26-42 ppm); low LREE/HREE (0.36-0.47) yet high Nb/Ta (47-85) ratios; along with weak negative Eu (0.71-0.90) and positive Ce (1.1-1.2) anomalies. By contrast, titanite from the actinolite and clinozoisite skarns shows generally higher concentrations of REE (2721-11,550 ppm), Nb (4350-24,228 ppm), Ta (1346-11,781 ppm), and W (32-337 ppm); highly variable LREE/HREE (0.14-0.70) but lower Nb/Ta (0.61-5.6) ratios; along with stronger yet variable negative Eu (0.02-0.14) and positive Ce (1.2-1.6) anomalies. Furthermore, the quartz vein-hosted titanite differs from those occurring in retrograde skarns in its significantly higher LREE/HREE ratios (0.78-6.3) and distinct Eu anomalies, which vary from negative to positive (0.15-1.2). Accordingly, the shift from relatively oxidizing to reducing conditions, as recorded by delta Eu and delta Ce in titanite, together with the different LREE/HREE and Nb/Ta ratios of the mineralizing fluids, as constrained by fluid composition and fractional precipitation, took place during emplacement of the hydrothermal W mineralization. In situ LA-ICP-MS U-Pb dating of hydrothermal titanite from the mineralized clinozoisite skarn, quartz vein, and actinolite skarn, respectively, yielded weighted mean Pb-207-corrected Pb-206/U-238 ages of 427 +/- 5 Ma, 427 +/- 4 Ma, and 426 +/- 7 Ma (1 sigma), indicative of the dominant Silurian W skarn mineralization at Jiepai. Our new U-Pb data are consistent with published ages for igneous and ore-forming activities in other major W (-polymetallic) deposits in the Miao'ershan-Yuechengling pluton, highlighting the capability of Early Paleozoic granites to develop W (-polymetallic) deposits in South China. Additionally, hydrothermal titanite carrying considerable concentrations of Nb, Ta, and W along with variable Nb/Ta ratios holds potential for deciphering the fluid chemistry and sources for W-skarn deposits elsewhere.
WOS关键词RARE-EARTH-ELEMENTS ; IRON SKARN DEPOSIT ; POLYGENETIC TITANITE ; POLYMETALLIC DEPOSIT ; ORE-DEPOSITS ; CONSTRAINTS ; ZIRCON ; ROCKS ; GEOCHEMISTRY ; GRANITES
资助项目National Natural Science Foundation of China[41472080]
WOS研究方向Mineralogy
语种英语
WOS记录号WOS:000507855100003
出版者MINERALOGICAL ASSOC CANADA
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95908]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Li, Xiao Feng
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
4.Hunan Inst Geol Survey, Changsha 410116, Peoples R China
推荐引用方式
GB/T 7714		 Li, Jia Dai,Li, Xiao Feng,Xiao, Rong. IN SITU LA-ICP-MS U-Pb GEOCHRONOLOGY AND TRACE ELEMENT ANALYSIS OF HYDROTHERMAL TITANITE FROM THE JIEPAI W-Cu DEPOSIT, SOUTH CHINA: IMPLICATIONS FOR W MINERALIZATION[J]. CANADIAN MINERALOGIST,2020,58(1):45-69.
APA Li, Jia Dai,Li, Xiao Feng,&Xiao, Rong.(2020).IN SITU LA-ICP-MS U-Pb GEOCHRONOLOGY AND TRACE ELEMENT ANALYSIS OF HYDROTHERMAL TITANITE FROM THE JIEPAI W-Cu DEPOSIT, SOUTH CHINA: IMPLICATIONS FOR W MINERALIZATION.CANADIAN MINERALOGIST,58(1),45-69.
MLA Li, Jia Dai,et al."IN SITU LA-ICP-MS U-Pb GEOCHRONOLOGY AND TRACE ELEMENT ANALYSIS OF HYDROTHERMAL TITANITE FROM THE JIEPAI W-Cu DEPOSIT, SOUTH CHINA: IMPLICATIONS FOR W MINERALIZATION".CANADIAN MINERALOGIST 58.1(2020):45-69.

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来源：地质与地球物理研究所

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