Two-tiered magmatic-hydrothermal and skarn origin of magnetite from Gol-Gohar iron ore deposit of SE Iran: In-situ LA-ICP-MS analyses

doi:10.1016/j.oregeorev.2018.09.025

GIG OpenIR

	Mirzaei, Rezvan 1; Ahmadi, Ali 1; Mirnejad, Hassan 2,3; Gao, Jian-Feng 4; Nakashima, Kazuo 5; Boomeri, Mohammad 1
	Two-tiered magmatic-hydrothermal and skarn origin of magnetite from Gol-Gohar iron ore deposit of SE Iran: In-situ LA-ICP-MS analyses
刊名	ORE GEOLOGY REVIEWS
ISSN号	0169-1368
	2018-11-01
卷号	102 页码:639-653
DOI	10.1016/j.oregeorev.2018.09.025
语种	英语
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
摘要	Genesis of magnetite from Gol-Gohar iron deposit (GGID) of southeastern Iran is studied with reference to elemental composition. More than 1.2 billion tonnes of magnetite ore at 58% total Fe is hosted by greenschist- to amphibolite-facies metapelites and magnesian marbles. The GGID occurs in the mainly-metamorphic terrain of Sanandaj-Sirjan geological province, with continental-margin tectonic setting. The magnetite-bearing ore is divided into two distinct types of massive and banded; the latter hosted mainly by magnesian marbles. Both subtypes of the ore bodies are associated with mineral assemblages consisting of calcite, dolomite, forsterite, tremolite-actinolite, talc, serpentine, and chlorite. The ore minerals in both subtypes are magnetite, hematite with minor amounts of pyrite, pyrrhotite, and chalcopyrite. Concentrations of temperature-dependent elements, Ti, Al, and Ga in the two subtypes would suggest that temperature of formation was higher for the massive magnetite (with Ti = 626 ppm, Al = 69 ppm and Ga = 56 ppm, on average) and relatively lower for the banded magnetite (with Ti = 60 ppm, Al = 62 ppm and Ga = 4 ppm, on average). The multi-element diagrams, for massive magnetite, show patterns closer to those of magmatic-hydrothermel iron deposits (Kiruna-type), whereas, patterns of the banded magnetite match better with those of skarn deposits, particularly the magnesian skarns. Average concentrations of V ( > 1000 ppm) and Cr (similar to 4 ppm) of the massive subtype fall within the range of those of Kiruna-type deposits, and the in average lower concentrations of V (similar to 10 ppm) and Cr (similar to 1 ppm) of the banded magnetite match the values of skarn deposits. The average V content of the massive magnetite (1342 ppm) is consistent with the global range of magmatic-hydrothermal magnetite (up to 3880 ppm), but different from global values of purely-magmatic magnetites (up to 6600 ppm). The banded magnetites contain 0.21-25 ppm V, which is only consistent with the lowest values of hydrothermal magnetites. We contend that the massive magnetite was formed by magmatic-hydrothermal processes (i.e., Kiruna type) and the banded magnetites were generated via metasomatic reactions between iron-rich residual magmatic fluids and the magnesian carbonate host rocks (i.e., skarn type).
关键词	Iron ore Skarn Kiruna-type Hydrothermal Magmatic Gol-Gohar
WOS记录号	WOS:000453493100031
收录类别	SCI
引用统计
文献类型	期刊论文
条目标识符	http://ir.gig.ac.cn/handle/344008/40870
通讯作者	Ahmadi, Ali
作者单位	1.Univ Sistan & Baluchestan, Fac Sci, Dept Geol, Zahedan 9816745639, Iran 2.Univ Tehran, Fac Sci, Dept Geol, Tehran 1415564155, Iran 3.Miami Univ, Dept Geol & Environm Earth Sci, Oxford, OH 45056 USA 4.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Guizhou, Peoples R China 5.Yamagata Univ, Fac Sci, Dept Earth & Environm Sci, Yamagata 9908560, Japan
推荐引用方式 GB/T 7714	Mirzaei, Rezvan,Ahmadi, Ali,Mirnejad, Hassan,et al. Two-tiered magmatic-hydrothermal and skarn origin of magnetite from Gol-Gohar iron ore deposit of SE Iran: In-situ LA-ICP-MS analyses[J]. ORE GEOLOGY REVIEWS,2018,102:639-653.
APA	Mirzaei, Rezvan,Ahmadi, Ali,Mirnejad, Hassan,Gao, Jian-Feng,Nakashima, Kazuo,&Boomeri, Mohammad.(2018).Two-tiered magmatic-hydrothermal and skarn origin of magnetite from Gol-Gohar iron ore deposit of SE Iran: In-situ LA-ICP-MS analyses.ORE GEOLOGY REVIEWS,102,639-653.
MLA	Mirzaei, Rezvan,et al."Two-tiered magmatic-hydrothermal and skarn origin of magnetite from Gol-Gohar iron ore deposit of SE Iran: In-situ LA-ICP-MS analyses".ORE GEOLOGY REVIEWS 102(2018):639-653.