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Scheelite geochemistry in porphyry-skarn W-Mo systems: A case study from the Gaojiabang Deposit, East China

文献类型：期刊论文

作者Song, Guoxue1,5; Cook, Nigel J.2; Li, Guangming1,3,5; Qin, Kezhang1,3,5; Ciobanu, Cristiana L.2; Yang, Yueheng3; Xu, Yingxia4
刊名ORE GEOLOGY REVIEWS
出版日期2019-10-01
卷号113页码:17
关键词Scheelite Substitution mechanism Redox state Sr-isotopes Porphyry-skarn system Gaojiabang deposit
ISSN号0169-1368
DOI10.1016/j.oregeorev.2019.103084
英文摘要Scheelite (CaWO4), a hydrothermal mineral commonly displaying enrichment in Mo (up to 16%) and/or rare earth elements (REE), is the main economic mineral in the Gaojiabang porphyry-skarn type W-Mo deposit, East China. Based on microscopic observations and in-situ LA-ICP-MS and LA-MC-ICP-MS analysis, three groups of scheelite, each with different geochemical characteristics, can be recognized. This evidence provides a good basis for considering the behavior of some trace elements in scheelite and how they may constrain ore genesis in porphyry-skarn systems. P-group scheelite occurs inside the porphyry rocks in the form of vein-hosted or disseminated scheelite. These have the lowest (Sr-87/Sr-86)(i) values (0.7089-0.7108), lowest Mo concentration (mean 213 ppm; n = 51), LREE/HREE ratios of 16.33-84.91, and highest Sigma REE concentration (191-405 ppm) with downwards-sloping REE fractionation trends. S-group scheelite occurs in skarns, coexists with skarn minerals (garnet, diopside, epidote, etc.) and has the highest (Sr-87/Sr-86)(i) values (0.7103-0.7113), highest Mo concentration (mean 1,323 ppm; n = 29), highest LREE/HREE ratio (62.6-164), and lowest Sigma REE concentrations (68.5-112 ppm), also with strongly downwards-sloping REE fractionation trends. H-group scheelite occurs within veins hosted by hornfels and displays moderate (Sr-87/Sr-86)(i) (0.70104-0.70122), Mo (mean 806 ppm; n = 17), LREE/HREE ratio (16.32-42.55), and Sigma REE concentration (98.3-167.6 ppm). During hydrothermal precipitation of scheelite, changing redox state plays a major role in controlling Mo behavior. Both the precipitation of early skarn minerals and changing redox states of ore-forming fluids likely result in an increase in Mo, and corresponding decrease of HREE, in scheelite (particularly in S-group scheelite). The Sr-isotope study indicates that crustal materials provided the main source for W-Mo-bearing ore-forming fluids. Furthermore, both fluid mixing and fluid-rock interaction played an important role in the evolution of ore-forming fluids: Formation water or groundwater was likely involved in ore formation. A geochemical model is described combining data for the different types of scheelite, and the behavior of Mo, REEs and Sr-isotopes, to constrain the evolution of ore-forming fluids and constrain ore genesis in the porphyry-skam system at Gaojiabang. This study contributes to the fingerprinting of ore deposits using scheelite geochemistry.
WOS关键词LA-ICP-MS ; FLUID-ROCK INTERACTION ; RARE-EARTH-ELEMENTS ; STRONTIUM ISOTOPE SYSTEMATICS ; ARCHEAN GOLD DEPOSITS ; LOWER YANGTZE VALLEY ; TRACE-ELEMENT ; SM-ND ; PARTITION-COEFFICIENTS ; SR ISOTOPE
资助项目National Natural Science Foundation of China (NSFC)[41102046]
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
语种英语
WOS记录号WOS:000491635200012
出版者ELSEVIER
资助机构National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC)
源URL[http://ir.iggcas.ac.cn/handle/132A11/95699]  
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
地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Song, Guoxue
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Adelaide, Sch Chem Engn & Adv Mat, Adelaide, SA 5005, Australia
3.Chinese Acad Sci, Inst Geol & Geophys, 19 Beitucheng, Beijing 100029, Peoples R China
4.North China Univ Sci & Technol, 46 Xinhua Rd, Tangshan 063009, Peoples R China
5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, 19 Yuanquan Rd, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Song, Guoxue,Cook, Nigel J.,Li, Guangming,et al. Scheelite geochemistry in porphyry-skarn W-Mo systems: A case study from the Gaojiabang Deposit, East China[J]. ORE GEOLOGY REVIEWS,2019,113:17.
APA Song, Guoxue.,Cook, Nigel J..,Li, Guangming.,Qin, Kezhang.,Ciobanu, Cristiana L..,...&Xu, Yingxia.(2019).Scheelite geochemistry in porphyry-skarn W-Mo systems: A case study from the Gaojiabang Deposit, East China.ORE GEOLOGY REVIEWS,113,17.
MLA Song, Guoxue,et al."Scheelite geochemistry in porphyry-skarn W-Mo systems: A case study from the Gaojiabang Deposit, East China".ORE GEOLOGY REVIEWS 113(2019):17.

入库方式： OAI收割

来源：地质与地球物理研究所

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