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Tectonic controls on Ni and Cu contents of primary mantle-derived magmas for the formation of magmatic sulfide deposits
Yao, Zhuosen1,2,4; Qin, Kezhang1,2,3; Mungall, James E.4
2018-10-01
Source PublicationAMERICAN MINERALOGIST
ISSN0003-004X
Volume103Issue:10Pages:1545-1567
AbstractWe have modeled the genesis of primary mantle-derived magma to explore the controls exerted on its Ni-Cu ore potential by water content, pressure, and mantle potential temperature (T-p). During decompression melting, Ni concentration in primary magma decreases with an increasing degree of melting, which is in contradiction to long-held understanding obtained from previous isobaric melting models. Pressure exerts a first-order control on the ore potential of primary plume-derived melt, such that plumes rising beneath thick lithosphere with melting paths terminating at relatively high pressure generate Ni-rich melts. Additionally, as plumes with higher T-p produce more Ni-rich melt at a higher pressure, the magmatism related to hotter plume-centers may have the greatest ore potential. On the other hand, the strong dependence of Cu behavior upon the presence or absence of residual sulfide is partly countered in decompression melting. Significant influences of mantle-contained water on Ni and Cu partitioning are restricted to low-degree melting. While release of H2O in lithosphere delamination may trigger voluminous magmatism, the Ni concentration in the melt is far lower than in melt generated from plumes. Furthermore, if isobaric melting dominates when the subcontinental litho spheric mantle (SCLM) is heated by underlying hotter plumes, the plume-lithosphere interaction plays no active role in the Ni ore potential of primary magma because derived melt volumes are relatively small. In subduction zones, flux-melting of the mantle wedge tends to generate cool Ni-poor melts, however hot subduction zones may produce magmas with increased metal concentrations. Overall, the anticipated ranges of Ni contents in primary melts are strongly controlled by tectonic setting, with a range of 100-300 ppm in subduction zones, 230-450 ppm in mid-ocean ridges, and 500-1300 ppm in plume suites. There are only minor differences in the Cu concentrations of primitive magmas generated from diverse tectonic settings, despite the variations in Cu partitioning behaviors.
KeywordMantle partial melting Ni and Cu partitioning behaviors tectonic settings ore potential of primary magma forward model Planetary Processes as Revealed by Sulfides and Chalcophile Elements
DOI10.2138/am-2018-6392
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC project ; NSFC project ; Chinese Scholarship Council ; Chinese Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC project ; NSFC project ; Chinese Scholarship Council ; Chinese Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC project ; NSFC project ; Chinese Scholarship Council ; Chinese Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC project ; NSFC project ; Chinese Scholarship Council ; Chinese Scholarship Council
WOS KeywordPLATINUM-GROUP ELEMENTS ; PLUME-LITHOSPHERE INTERACTION ; NOMINALLY ANHYDROUS MINERALS ; SUB-CONTINENTAL LITHOSPHERE ; MIDOCEAN RIDGE BASALTS ; LARGE IGNEOUS PROVINCE ; SR-ND ISOTOPES ; EARTHS MANTLE ; SUBDUCTION-ZONE ; OXIDATION-STATE
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFC0601306] ; NSFC project[41830430] ; Chinese Scholarship Council
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC project ; NSFC project ; Chinese Scholarship Council ; Chinese Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC project ; NSFC project ; Chinese Scholarship Council ; Chinese Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC project ; NSFC project ; Chinese Scholarship Council ; Chinese Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC project ; NSFC project ; Chinese Scholarship Council ; Chinese Scholarship Council
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000445855200004
PublisherMINERALOGICAL SOC AMER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/89219
Collection矿产资源研究院重点实验室
Corresponding AuthorQin, Kezhang
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
4.Carleton Univ, Dept Earth Sci, 1125 Colonel Dr, Ottawa, ON K1S 5B6, Canada
Recommended Citation
GB/T 7714
Yao, Zhuosen,Qin, Kezhang,Mungall, James E.. Tectonic controls on Ni and Cu contents of primary mantle-derived magmas for the formation of magmatic sulfide deposits[J]. AMERICAN MINERALOGIST,2018,103(10):1545-1567.
APA Yao, Zhuosen,Qin, Kezhang,&Mungall, James E..(2018).Tectonic controls on Ni and Cu contents of primary mantle-derived magmas for the formation of magmatic sulfide deposits.AMERICAN MINERALOGIST,103(10),1545-1567.
MLA Yao, Zhuosen,et al."Tectonic controls on Ni and Cu contents of primary mantle-derived magmas for the formation of magmatic sulfide deposits".AMERICAN MINERALOGIST 103.10(2018):1545-1567.
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