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CONTROLLING MECHANISMS FOR MOLYBDENUM ISOTOPE FRACTIONATION IN PORPHYRY DEPOSITS: THE QULONG EXAMPLE
Li, Yang1; McCoy-West, Alex J.2,3; Zhang, Shuang4; Selby, David3,5; Burton, Kevin W.3; Horan, Kate3
2019-08-01
Source PublicationECONOMIC GEOLOGY
ISSN0361-0128
Volume114Issue:5Pages:981-992
AbstractMolybdenite-bearing porphyry deposits are the predominant supplier of molybdenum to industrialized society and one of the main hosts of Mo in the upper continental crust. The Mo isotope compositions (delta Mo-98/95, normalized to NIST3134 equals 0 parts per thousand) of molybdenite show considerable variation (-1.62 to + 2.27 parts per thousand), but the factors controlling this variability remain poorly constrained. This information is critical for underpinning genetic models of porphyry deposits, understanding elemental cycling, and utilizing the delta Mo-98/95 of marine sediments as a paleoredox proxy. Using the well-characterized Qulong porphyry Cu-Mo deposit (Tibet) as an example, here we discuss how rapid cooling, facilitated by mixing hot magmatic fluid with cold meteoric water, can be a controlling factor on efficient mineralization, and then tackle how fluid evolution regulates molybdenum isotope fractionation. Molybdenites, which preferentially partition isotopically light Mo (Rayleigh fractionation), precipitated from a single fluid will develop a heavier delta Mo-98/95 composition over time, and this also creates hetero-geneous delta Mo-98/95 between molybdenite grains. Whereas a fluid undergoing multiple episodes of intensive boiling will gradually lose its isotopically heavy Mo to the vapor phase, molybdenites crystallizing successively from the residual liquid will then have lighter delta Mo-98/95 over time. However, when mineralization efficiency becomes too low, a negligible variation in delta Mo-98/95 of molybdenite is observed. Given that the mineralization efficiency (i.e., the amount of Mo crystallized as molybdenite from the fluid) rarely reaches 100% and molybdenite favors isotopically light Mo, the presence of a residual fluid with isotopically heavy Mo is inevitable. This residual fluid may then become trapped in alteration halos; hence, delta Mo-98/95 has the potential to aid in locating the mineralization center (e.g., lighter delta Mo-98/95 toward the orebody). The residual fluid may also feed surface hydrological systems and eventually impact Mo cycling. Our study highlights that understanding the controls of isotope fractionation is critical to bridge the gap between ore formation and elemental cycling, and that other transition metals (e.g., Cu, Fe, and Zn) may follow similar trajectories.
DOI10.5382/econgeo.4653
Funding OrganizationChinese Academy of Sciences Pioneer Hundred Talents Program ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Total Endowment Fund ; Total Endowment Fund ; CUG Wuhan ; CUG Wuhan ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Total Endowment Fund ; Total Endowment Fund ; CUG Wuhan ; CUG Wuhan ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Total Endowment Fund ; Total Endowment Fund ; CUG Wuhan ; CUG Wuhan ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Total Endowment Fund ; Total Endowment Fund ; CUG Wuhan ; CUG Wuhan
WOS KeywordRE-OS GEOCHRONOLOGY ; MAGMATIC-HYDROTHERMAL EVOLUTION ; MO DEPOSIT ; CU ; VAPOR ; SYSTEMS ; FLUID ; AU ; GEOCHEMISTRY ; TEMPERATURES
Language英语
Funding ProjectChinese Academy of Sciences Pioneer Hundred Talents Program ; State Key Laboratory of Lithospheric Evolution[SKL-K201706] ; Total Endowment Fund ; CUG Wuhan
Funding OrganizationChinese Academy of Sciences Pioneer Hundred Talents Program ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Total Endowment Fund ; Total Endowment Fund ; CUG Wuhan ; CUG Wuhan ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Total Endowment Fund ; Total Endowment Fund ; CUG Wuhan ; CUG Wuhan ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Total Endowment Fund ; Total Endowment Fund ; CUG Wuhan ; CUG Wuhan ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; Chinese Academy of Sciences Pioneer Hundred Talents Program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Total Endowment Fund ; Total Endowment Fund ; CUG Wuhan ; CUG Wuhan
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000477842500006
PublisherSOC ECONOMIC GEOLOGISTS, INC
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/92931
Collection岩石圈演化国家重点实验室
Corresponding AuthorLi, Yang
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 10029, Peoples R China
2.Monash Univ, Sch Earth Atmosphere & Environm, Melbourne, Vic 3800, Australia
3.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
4.Yale Univ, Dept Geol & Geophys, POB 6666, New Haven, CT 06511 USA
5.China Univ Geosci, Sch Earth Resources, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li, Yang,McCoy-West, Alex J.,Zhang, Shuang,et al. CONTROLLING MECHANISMS FOR MOLYBDENUM ISOTOPE FRACTIONATION IN PORPHYRY DEPOSITS: THE QULONG EXAMPLE[J]. ECONOMIC GEOLOGY,2019,114(5):981-992.
APA Li, Yang,McCoy-West, Alex J.,Zhang, Shuang,Selby, David,Burton, Kevin W.,&Horan, Kate.(2019).CONTROLLING MECHANISMS FOR MOLYBDENUM ISOTOPE FRACTIONATION IN PORPHYRY DEPOSITS: THE QULONG EXAMPLE.ECONOMIC GEOLOGY,114(5),981-992.
MLA Li, Yang,et al."CONTROLLING MECHANISMS FOR MOLYBDENUM ISOTOPE FRACTIONATION IN PORPHYRY DEPOSITS: THE QULONG EXAMPLE".ECONOMIC GEOLOGY 114.5(2019):981-992.
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