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Magnetite geochemistry and iron isotope signature of disseminated and massive mineralization in the Kalatongke magmatic Cu-Ni sulfide deposit, northwest China
Tang, Dongmei1,2; Qin, Kezhang1,2,3; Mao, Yajing1,2; Evans, Noreen J.4
2022-09-05
Source PublicationCHEMICAL GEOLOGY
ISSN0009-2541
Volume605Pages:17
AbstractMagnetite is a common accessory mineral and an indicator to magma evolution and sulfide fractional crystallization in magmatic Ni???Cu sulfide deposits. The Kalatongke magmatic sulfide deposit at the southern margin of the Central Asian Orogenic Belt is composed of 11 mafic intrusions. The sulfide orebodies (Y1, Y1 deep, and Y2) are hosted by three small mafic intrusions, and magnetite is common in all mineralized samples. Based on ilmenite exsolution texture, composition, and type of mineralization, three types of magnetite are identified, (1) primary Fe-rich magma-related magnetite (type 1), (2) sulfide liquid-related magnetite (type 2), and (3) hydrothermal magnetite (type 3). We speculate that Fe isotope equilibrium fractionation between early or cocrystallized light 54Fe-enriched sulfide and magnetite may account for the ultra-high magnetite 856Fe value (0.70%o to 1.35 %o) in the magmatic magnetite (types 1 and 2). Enriched compatible elements in type 1 magnetite (TiO2 = 1.52 wt% to 7.89 wt%, V = 775 ppm to 2420 ppm, Cr = 2697 ppm to 14,658 ppm, and Ni contents = 478 ppm to 1256 ppm), reflect the characteristics of primary Fe-rich magmatic magnetite crystallized at relatively high temperature and low oxygen fugacity. Type 2 magnetite in massive ores has Ni (762 ppm to 1769 ppm) and 856Fe (0.89 %o to 1.10 %o) values similar to type 1 magnetite, but significantly lower TiO2, V and Cr contents (TiO2 = 0.07 to 3.72 wt%, V = 61 to 2314 ppm, Cr = 5 to 2937 ppm), indicating co-crystallization with an evolved sulfide liquid across a wide span of temperature and oxygen fugacity. Type 3 magnetite is of hydrothermal fluid origin, with low 856Fe (0.29 %o to 0.41 %o) and Ni (177 ppm to 377 ppm). Magnetite composition and Fe isotope signatures at the Kalatongke magmatic sulfide deposit can reveal the genesis of magnetite and the evolution of the melt and sulfide. The Y1 orebody was completely crystallized over a short period of time, while the Y1 deep and Y2 east orebodies underwent a protracted evolution during which magnetite co-crystallized from primitive Fe-rich melt, Fe-rich evolved melt and Cu-rich intermediate sulfide solution. Magnetite and sulfide in the Y2 west massive orebody likely formed last. The compatibility of both lithophile and chalcophile elements, combined with Fe isotopes in magnetite, makes magnetite a good indicator of silicate and sulfide melt evolution.
KeywordMagnetite Iron isotope Formation of ores Kalatongke Central Asian Orogenic Belt
DOI10.1016/j.chemgeo.2022.120965
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordFE-TI OXIDES ; TRACE-ELEMENT DISTRIBUTION ; SR-ND ISOTOPES ; ORE-DEPOSITS ; MULTIPLE S ; NW CHINA ; CONTINENTAL GROWTH ; MAFIC INTRUSIONS ; APATITE DEPOSITS ; EASTERN TIANSHAN
Language英语
Funding ProjectNational Natural Science Foundation of China[42073039]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000810952500001
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/106112
Collection矿产资源研究院重点实验室
Corresponding AuthorTang, Dongmei
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Curtin Univ, John Laeter Ctr, Sch Earth & Planetary Sci, Perth, WA 6845, Australia
First Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Tang, Dongmei,Qin, Kezhang,Mao, Yajing,et al. Magnetite geochemistry and iron isotope signature of disseminated and massive mineralization in the Kalatongke magmatic Cu-Ni sulfide deposit, northwest China[J]. CHEMICAL GEOLOGY,2022,605:17.
APA Tang, Dongmei,Qin, Kezhang,Mao, Yajing,&Evans, Noreen J..(2022).Magnetite geochemistry and iron isotope signature of disseminated and massive mineralization in the Kalatongke magmatic Cu-Ni sulfide deposit, northwest China.CHEMICAL GEOLOGY,605,17.
MLA Tang, Dongmei,et al."Magnetite geochemistry and iron isotope signature of disseminated and massive mineralization in the Kalatongke magmatic Cu-Ni sulfide deposit, northwest China".CHEMICAL GEOLOGY 605(2022):17.
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