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Cathodoluminescence and trace elements of scheelite: Constraints on ore-forming processes of the Dabaoshan porphyry Mo-W deposit, South China
Su, Shi-Qiang1,2,3,4; Qin, Ke-Zhang1,2,3; Li, Guang-Ming1,2,3; Olin, Paul4; Thompson, Jay4
2019-12-01
Source PublicationORE GEOLOGY REVIEWS
ISSN0169-1368
Volume115Pages:18
AbstractScheelite, a good proxy to record the complex history of hydrothermal evolution, has been investigated in the Dabaoshan porphyry Mo-W deposit, South China. Based on cathodoluminescence (CL) textures, mineral paragenesis, and chemical characterization, three generations of scheelite were identified (Sch1-Sch3). Sch1 is disseminated in porphyry rocks, or occasionally occurs in early quartz-molybdenite veins. It is CL-dark and contains high concentrations of V, Sr, Mo, Nb, Ta, and rare earth elements (REE), low U/Th ratios (0.37 mean) and light REE (LREE)-enriched patterns with negative Eu anomalies. Sch2 and Sch3 mainly occur in late quartzpyrite-scheelite +/- chalcopyrite veins. Sch2 is CL-bright and commonly rims Sch1, and/or is overgrown by late oscillatory Sch3. Compared with Sch1, Sch2 shows depletion in V, Sr, Mo, Nb, and Ta, but slight enrichment in U and Th, and is characterized by middle REE (MREE)-enriched patterns with negative Eu anomalies. Sch3 grains show reddish-brown color under transmitted light and exhibit oscillatory zonation under CL. Sch3 has elevated concentrations of Mn, U (up to 4484 ppm), and Th (up to 18.8 ppm) contents, and high U/Th ratios (1175 mean). Chemical mapping reveals a negative correlation between U concentrations and CL intensity, which is attributed to the radiation damage caused by the radioactive decay of U. Based on the REE patterns, Sch3 is subdivided into Sch3a and Sch3b. Sch3a shows MREE-enriched patterns with slight negative to positive Eu anomalies, while Sch3b is LREE-enriched and shows gradual depletion in MREE and HREE with increasing positive Eu anomalies in consecutive growth zones. The Dabaoshan porphyry and all generations of scheelites show similar Y/Ho ratios, indicating that oreforming fluids were mainly derived from the Dabaoshan porphyry. Our results reveal that REE chiefly substitute into scheelite by the mechanism Ca2+ = REE3+ + Na + while U substitutes for W into scheelite. Sch1 containing the highest concentrations of Mo, V, Nb, and Ta precipitates from the magmatic fluids at high temperature. It inherits the LREE-enriched patterns and negative Eu anomalies from the causative porphyry. From early to late generations, the gradual depletion of Mo, Nb, Ta, and V in scheelite is ascribed to the precipitation of molybdenite, rutile, and scheelite, whereas the increasing concentrations of U and Th in scheelite indicates the gradual enrichment of U and Th in ore-forming fluids. The increasing U/Th ratios in scheelites may result from not only the differential solubility between U and Th in fluids, but also the preferential incorporation of U relative to Th in scheelite. Compared with Sch1, Sch2 and Sch3a are depleted in LREE, which is interpreted to reflect the precipitation of apatite. Sch3b with various REE patterns within single grains is interpreted as precipitation from a closed-system accompanied by intermittent fluid replenishment. This study demonstrates that REE patterns of scheelite are controlled by multiple factors, including substitution mechanism, fluid composition, hydrothermal alteration, precipitation of REE-rich minerals, and hydrothermal dynamics during scheelite growth. The systematic variation of trace elements in scheelite suggests that scheelite chemistry can be used to monitor the evolution of ore-forming fluids in the Dabaoshan deposit.
KeywordScheelite Trace elements Cathodoluminescence Rare earth elements Dabaoshan Porphyry Mo-W deposit
DOI10.1016/j.oregeorev.2019.103183
Funding OrganizationChina Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF)
WOS KeywordLA-ICP-MS ; NORTHERN GUANGDONG PROVINCE ; U-PB ; HYDROTHERMAL GEOCHEMISTRY ; PARTITION-COEFFICIENTS ; POLYMETALLIC DEPOSIT ; CALCIUM TUNGSTATE ; SKARN DEPOSIT ; GOLD DEPOSITS ; NEW-MEXICO
Language英语
Funding ProjectChina Geological Survey[12120115035401] ; China Geological Survey[12120114067101] ; Society of Economic Geologists Foundation (SEGF)[SGR-17-37]
Funding OrganizationChina Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; China Geological Survey ; China Geological Survey ; China Geological Survey ; China Geological Survey ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF) ; Society of Economic Geologists Foundation (SEGF)
WOS Research AreaGeology ; Mineralogy ; Mining & Mineral Processing
WOS SubjectGeology ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000501412500016
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95837
Collection矿产资源研究院重点实验室
Corresponding AuthorQin, Ke-Zhang
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ Tasmania, Sch Nat Sci, CODES, Hobart, Tas 7001, Australia
First Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Su, Shi-Qiang,Qin, Ke-Zhang,Li, Guang-Ming,et al. Cathodoluminescence and trace elements of scheelite: Constraints on ore-forming processes of the Dabaoshan porphyry Mo-W deposit, South China[J]. ORE GEOLOGY REVIEWS,2019,115:18.
APA Su, Shi-Qiang,Qin, Ke-Zhang,Li, Guang-Ming,Olin, Paul,&Thompson, Jay.(2019).Cathodoluminescence and trace elements of scheelite: Constraints on ore-forming processes of the Dabaoshan porphyry Mo-W deposit, South China.ORE GEOLOGY REVIEWS,115,18.
MLA Su, Shi-Qiang,et al."Cathodoluminescence and trace elements of scheelite: Constraints on ore-forming processes of the Dabaoshan porphyry Mo-W deposit, South China".ORE GEOLOGY REVIEWS 115(2019):18.
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