中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Crystallization of spinel from coexisting silicate and sulfide immiscible liquids: An equilibrium case with postcumulus reactions

文献类型:期刊论文

AuthorMao, Ya-Jing2; Barnes, Stephen J.1; Schoneveld, Louise1; Godel, Belinda1; Williams, Morgan1; Tang, Dongmei2; Kang, Zhen2,3; Qin, Ke-Zhang2,3
SourceAMERICAN MINERALOGIST
Issued Date2023-05-25
Volume108Issue:5Pages:832-846
ISSN0003-004X
KeywordSpinel magnetite equilibrium crystallization postcumulus reactions immiscible liquids Kalatongke magmatic Ni-Cu deposit
DOI10.2138/am-2022-8473
English AbstractSpinel minerals occur as inclusions in both silicates and sulfides in the Kalatongke magmatic Ni-Cu deposit in NW. China, showing textural and compositional variations. The spinel enclosed in olivine and other silicates (orthopyroxene, clinopyroxene, and hornblende) is predominantly Cr-magnetite with minor Cr-spinel, having wide variations in MgO (0.1-8.0 wt%), Al2O3 (1-25 wt%), Cr2O3 (3-20 wt%), and TiO2 (0.5-6.2 wt%) contents. Such continuous variations suggest that Cr-magnetite in silicates was crystallized from residual melts and experienced extensive reaction with trapped liquid undergoing a typical tholeiitic trend of increasing Fe and Ti concentrations. Crystals of Cr-magnetite enclosed in disseminated sulfides have similar Mg, Al, Cr, Ti, V, Sc, Ga, Mo, Zr, and Nb concentrations to the Cr-magnetite in silicates. Such compositional similarity, which is explained by the simultaneous equilibrium crystallization of Cr-magnetite from the silicate and sulfide melts, shows that the Kalatongke deposit is a typical example of where the same mineral phase is formed from two coexisting immiscible liquids. However, the Cr-magnetite in disseminated sulfide and that in silicates show distinctly different crystal size distribution patterns, illustrating that the chemical equilibrium was attained despite contrasting growth rates. Nevertheless, the Cr-magnetite in disseminated sulfides shows significantly lower Ni, Co, and Zn contents (median value of 845, 22, and 319 ppm) than that in silicates (median value of 1428, 160, and 1039 ppm). This cannot be the result of sulfide fractionation because there is little compositional variation between Cr-magnetite included in pyrrhotite (early crystallized phase) and that immersed in chalcopyrite (late crystallized phase). Such Ni, Co, and Zn depletions, combined with the relatively constrained Fe/Ni, Fe/Co, and Fe/Zn ratios in those Cr-magnetite, are attributed to postcumulus reactions between Cr-magnetite and sulfide melts. The spinel hosted by massive sulfides is magnetite, which has distinctly different compositional variations and crystal size distribution patterns compared with those of the silicate-hosted Cr-magnetite, although the magnetite in massive ore generally has similar contents in some lithophile elements (Zr, Ta, Mo, Sn, Mn) to the silicate-hosted Cr-magnetite. This could be taken as evidence for a mixture of early accumulated sulfide pools with a component of drained sulfide from the cumulates above. This study shows a detailed textural and compositional investigation of spinel is useful to decode the sulfide evolution processes during the formation of magmatic Ni-Cu deposits and highlights that equilibrium crystallization and postcumulus reactions play critical roles in controlling the spinel/magnetite composition.
WOS KeywordSIZE DISTRIBUTION CSD ; ASIAN OROGENIC BELT ; FE-NI EXCHANGE ; NW CHINA ; CHROMIAN SPINEL ; NORTHERN XINJIANG ; WESTERN-AUSTRALIA ; OXIDATION-STATE ; ORE-DEPOSITS ; CU
Funding ProjectNational Sciences Foundation of China[42072105] ; National Sciences Foundation of China[41830430] ; National Sciences Foundation of China[92162323] ; National Key Research and Development Program of China[2017YFC0601204] ; Youth Innovation Promotion Association CAS
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
Language英语
PublisherMINERALOGICAL SOC AMER
WOS IDWOS:000989025200004
Funding OrganizationNational Sciences Foundation of China ; National Sciences Foundation of China ; National Sciences Foundation of China ; National Sciences Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Sciences Foundation of China ; National Sciences Foundation of China ; National Sciences Foundation of China ; National Sciences Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Sciences Foundation of China ; National Sciences Foundation of China ; National Sciences Foundation of China ; National Sciences Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Sciences Foundation of China ; National Sciences Foundation of China ; National Sciences Foundation of China ; National Sciences Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/111193]  
Collection地质与地球物理研究所_中国科学院矿产资源研究重点实验室
Corresponding AuthorMao, Ya-Jing
Affiliation1.CSIRO, Mineral Resources, Perth, WA 6151, Australia
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Mao, Ya-Jing,Barnes, Stephen J.,Schoneveld, Louise,et al. Crystallization of spinel from coexisting silicate and sulfide immiscible liquids: An equilibrium case with postcumulus reactions[J]. AMERICAN MINERALOGIST,2023,108(5):832-846.
APA Mao, Ya-Jing.,Barnes, Stephen J..,Schoneveld, Louise.,Godel, Belinda.,Williams, Morgan.,...&Qin, Ke-Zhang.(2023).Crystallization of spinel from coexisting silicate and sulfide immiscible liquids: An equilibrium case with postcumulus reactions.AMERICAN MINERALOGIST,108(5),832-846.
MLA Mao, Ya-Jing,et al."Crystallization of spinel from coexisting silicate and sulfide immiscible liquids: An equilibrium case with postcumulus reactions".AMERICAN MINERALOGIST 108.5(2023):832-846.

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来源:地质与地球物理研究所

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