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Mineral paragenesis, fluid inclusions, H-O isotopes and ore-forming processes of the giant Dahutang W-Cu-Mo deposit, South China
Song, Wei-Le1,2; Yao, Jun-Ming1; Chen, Hua-Yong1; Sun, Wei-Dong1,3; Ding, Jun-Ying4; Xiang, Xin-Kui5; Zuo, Quan-Shi6; Lai, Chun-Kit7,8
2018-08-01
Source PublicationORE GEOLOGY REVIEWS
ISSN0169-1368
Volume99Pages:116-150
Corresponding AuthorYao, Jun-Ming(yaojunming@gig.ac.cn)
AbstractThe newly discovered giant Dahutang W-Cu-Mo deposit in the central part of the Jiangnan Orogen hosts an estimated resource of 1.1 million tons (Mt) of W03, plus a proven resource of 0.65 Mt Cu and 0.08 Mt Mo. The Dahutang deposit is temporally and spatially associated with the Late Mesozoic S-type granites emplaced into the Neoproterozoic Jiuling granodiorite batholith and the Shuangqiaoshan Group. Based on petrographic observations, eight hydrothermal alteration/mineralization stages have been recognized, comprising pegmatitic (Stage I), potassic alteration (Stage II), albite alteration (Stage III), greisenization and main mineralization (Stage IV), polymetallic sulfide mineralization (Stage V), late scheelite mineralization (Stage VI), carbonate alteration (Stage VII) and supergene alteration (Stage VIII). Stage IV can be further divided into the early greisenization (Stage IV-A), the main wolframite mineralization (Stage IV-B) and the main scheelite mineralization (Stage IV C). Fluid inclusion and H-0 isotope analyses on nine Stage IV to VII ore/gangue minerals (wolframite, cassiterite, scheelite, sphalerite, fluorapatite, fluorite, quartz, calcite and chlorite) suggest the presence of an early W and a late Cu-Mo ore-forming fluid system. The early ore-forming fluids belong to a medium to high temperature (200-420 degrees C), low salinity H2O-NaCl-CaC12 system. This primary magmatic-hydrothermal fluid (8180nuid = 5.4 to 8.8 parts per thousand and SD =-102 to- 75 parts per thousand) was likely exsolved from the Late Jurassic granites at Dahutang. Wolframite and scheelite coexist closely with fluorapatite and fluorite, respectively, indicating that the volatile-rich fluids at Dahutang were also rich in tungsten, fluorine and phosphorous. Tungsten was likely transported as tungstate species (e.g., W042 and HW04-), oxygen fluorine complexes (e.g., [WO2F4]2-, [WO3F2]2-) and phosphorous heteropolytungstate (e.g., [P(W12040)]3-) in the fluids. Fluorapatite and wolframite may have precipitated first when the temperature dropped from 400 to 320 C (along with pH increase) at an estimated depth of 7.8 km. This was likely followed by the extensive scheelite mineralization (with fluorite precipitation) that formed huge disseminated/ veinlet-type W orebodies when the temperature further dropped to 200 C (along with pH increase). After the W mineralization, extensive Cu-Mo polymetallic mineralization and the associated sericite-chlorite alterations may have formed by the granite porphyry and/or muscovite granite emplacement. The late ore forming fluids belong to a medium to high temperature (200-360 C), low salinity H2O-NaCl-CaCl2 system. Molybdenum was likely transported mainly as Mo complexes (e.g., H2MoO(4)/MoO(4)2-), and copper as Cu-Cl complexes. Molybdenite and chalcopyrite may have begun to precipitate when the fluids ascended and the temperature dropped to 330 C. Meteoric water incursion may have then occurred (S180fluid = 1.9-6.9 parts per thousand and SD =-99 to- 68 parts per thousand) and further cooled the fluid system to 250 degrees C, forming large Cu-Mo orebodies.
KeywordLate Mesozoic Dahutang deposit Fluid inclusions H-O isotopes Giant W-Cu-Mo mineralization South China
DOI10.1016/j.oregeorev.2018.06.002
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2016YFC0600405] ; National Natural Science Foundation of China[41672079] ; National Natural Science Foundation of China[41372085] ; Chinese Academy of Sciences[XDB18000000]
WOS Research AreaGeology ; Mineralogy ; Mining & Mineral Processing
WOS SubjectGeology ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000441491200007
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/160001
Collection深海极端环境与生命过程研究中心
Corresponding AuthorYao, Jun-Ming
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
4.Nanjing Univ, Sch Earth Sci & Engn, Inst Geofluids, State Key Lab Mineral Deposits Res, Nanjing 210046, Jiangsu, Peoples R China
5.Jiangxi Bur Geol Mineral Resources Explorat & Dev, Geol Team 916, Jiujiang 332000, Peoples R China
6.Jiangxi Bur Geol Mineral Resources Explorat & Dev, Noethwestern Geol Team, Jiujiang 332100, Peoples R China
7.Univ Brunei Darussalarn, Fac Sci, Gadong BE1410, Brunei
8.Univ Tasmania, ARC Ctr Excellence Ore Deposits CODES, Hobart, Tas 7001, Australia
Recommended Citation
GB/T 7714
Song, Wei-Le,Yao, Jun-Ming,Chen, Hua-Yong,et al. Mineral paragenesis, fluid inclusions, H-O isotopes and ore-forming processes of the giant Dahutang W-Cu-Mo deposit, South China[J]. ORE GEOLOGY REVIEWS,2018,99:116-150.
APA Song, Wei-Le.,Yao, Jun-Ming.,Chen, Hua-Yong.,Sun, Wei-Dong.,Ding, Jun-Ying.,...&Lai, Chun-Kit.(2018).Mineral paragenesis, fluid inclusions, H-O isotopes and ore-forming processes of the giant Dahutang W-Cu-Mo deposit, South China.ORE GEOLOGY REVIEWS,99,116-150.
MLA Song, Wei-Le,et al."Mineral paragenesis, fluid inclusions, H-O isotopes and ore-forming processes of the giant Dahutang W-Cu-Mo deposit, South China".ORE GEOLOGY REVIEWS 99(2018):116-150.
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