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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
发表期刊AMERICAN MINERALOGIST
ISSN0003-004X
卷号103期号:10页码:1545-1567
摘要We 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.
关键词Mantle 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
资助者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 ; 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
关键词[WOS]PLATINUM-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
语种英语
资助项目National Key Research and Development Program of China[2017YFC0601306] ; NSFC project[41830430] ; Chinese Scholarship Council
资助者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 ; 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研究方向Geochemistry & Geophysics ; Mineralogy
WOS类目Geochemistry & Geophysics ; Mineralogy
WOS记录号WOS:000445855200004
出版者MINERALOGICAL SOC AMER
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89219
专题矿产资源研究院重点实验室
通讯作者Qin, Kezhang
作者单位1.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
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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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