Refractory chromitites recovered from the Eretria mine, East Othris massif (Greece): Implications for metallogeny and deformation of chromitites within the lithospheric mantle portion of a forearc-type ophiolite

doi:10.1016/j.geoch.2018.12.003

CORC > 地质与地球物理研究所 > 中国科学院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

	Refractory chromitites recovered from the Eretria mine, East Othris massif (Greece): Implications for metallogeny and deformation of chromitites within the lithospheric mantle portion of a forearc-type ophiolite
	Kapsiotis, Argyrios 1,2; Economou-Eliopoulos, Maria 3; Zheng, Hao 1; Su, Ben-Xun 4,5; Lenaz, Davide 6; Jing, Jie-Jun 4,5; Antonelou, Aspasia 7,8; Velicogna, Matteo 6; Xia, Bin 1
刊名	CHEMIE DER ERDE-GEOCHEMISTRY
	2019
卷号	79 期号:1 页码:130-152
关键词	Chromitite Ophiolite Othris Greece Neo-Tethys
ISSN号	0009-2819
DOI	10.1016/j.geoch.2018.12.003
英文摘要	The chrome ores of the abandoned Eretria mine of the East Othris ophiolite occur within a pervasively serpentinized and sheared harzburgite body. They consist of massive chromitites with mylonitic fabric in imbricate shaped pods. Modal analyses of these ores average at about 90-95% chromian spinel (Cr-spinel) and 5-10% secondary silicates. Chromian spinel compositions vary in Cr# [Cr/(Cr + Al) x 100] and Mg# [Mg/ (Mg + Fe2+) x 100] from 44 to 62 and from 59 to 81, respectively. Trace element (Ti, Ni, V, Mn, Zn, Sc, Co and Ga) contents in Cr-spinel do not show significant variations from grain cores to grain boundaries. However, Cr-spinel compositions show depletions in Ti, Zn and Sc when compared to the composition of accessory Cr-spinel from typical mid-ocean ridge basalts (MORE). Mineral inclusions hosted in Cr-spinel comprise a range of (hydrous and anhydrous) silicate and base metal (BM) minerals occasionally intergrown with phosphate minerals and rare intermetallic compounds. A number of these inclusions have Cr-spinel rims with higher Cr# (63-68) than those of the enclosing Cr-spinel grains. The absence of dunite sheaths around chromitites is interpreted as an artifact of dunite structural obliteration during prolonged ductile shearing within harzburgite. The microtextural characteristics of a number of inclusions in Cr-spinel imply that they were initially fully molten. Furthermore, primary hydrosilicate (amphibole, phlogopite) inclusions in Cr-spinel indicate that chromitites crystallized from a water-bearing melt. Chromian spinel rims around silicate inclusions probably represent early crystals generated from a primitive magma produced by melting of a depleted mantle source. Geochemical calculations demonstrate that the parental melts of chromitites had intermediate affinity between MORE and arc-related magmas. Our preferred hypothesis for the genesis of the Eretria chromitites is that they were formed from a melt originated within the hydrated mantle wedge beneath a nascent forearc basin during subduction initiation.
资助项目	National Natural Science Foundation of China (NNSFC)[41402065] ; National Natural Science Foundation of China (NNSFC)[41706055] ; National Natural Science Foundation of China (NNSFC)[41802001] ; Natural Science Foundation of Guangdong Province[2018A030310303] ; Natural Science Foundation of Guangdong Province[2018B030311030]
WOS关键词	PLATINUM-GROUP ELEMENTS ; MOHO TRANSITION ZONE ; CR-RICH CHROMITITES ; PODIFORM CHROMITITES ; OMAN OPHIOLITE ; SUBDUCTION INITIATION ; CHROMIAN SPINEL ; COMPOSITIONAL VARIATIONS ; CHEMICAL-COMPOSITION ; ULTRAMAFIC MASSIF
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER GMBH
WOS记录号	WOS:000480668500006
资助机构	National Natural Science Foundation of China (NNSFC) ; National Natural Science Foundation of China (NNSFC) ; Natural Science Foundation of Guangdong Province ; Natural Science Foundation of Guangdong Province ; National Natural Science Foundation of China (NNSFC) ; National Natural Science Foundation of China (NNSFC) ; Natural Science Foundation of Guangdong Province ; Natural Science Foundation of Guangdong Province ; National Natural Science Foundation of China (NNSFC) ; National Natural Science Foundation of China (NNSFC) ; Natural Science Foundation of Guangdong Province ; Natural Science Foundation of Guangdong Province ; National Natural Science Foundation of China (NNSFC) ; National Natural Science Foundation of China (NNSFC) ; Natural Science Foundation of Guangdong Province ; Natural Science Foundation of Guangdong Province
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/93340]
专题	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
通讯作者	Kapsiotis, Argyrios
作者单位	1.Sun Yat Sen Univ, Guangdong Prov Key Lab Marine Resources & Coastal, Sch Marine Sci, Key Lab Offshore Oil Explorat & Dev,Guangdong Hig, Guangzhou 510275, Guangdong, Peoples R China 2.Sun Yat Sen Univ, Sch Earth Sci & Geol Engn, Guangzhou 510275, Guangdong, Peoples R China 3.Natl Univ Athens, Sect Econ Geol & Geochem, Dept Geol & Geoenvironmen4, Athens 15784, Greece 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Univ Trieste, Dept Math & Geosci, Via Weiss 8, I-34128 Trieste, Italy 7.Inst Chem Engn Sci Forth ICE HT, Fdn Res & Technol Hellas, POB 1414, GR-26504 Rion, Greece 8.Univ Trieste, Dept Math & Geosci, I-34127 Trieste, Italy
推荐引用方式 GB/T 7714	Kapsiotis, Argyrios,Economou-Eliopoulos, Maria,Zheng, Hao,et al. Refractory chromitites recovered from the Eretria mine, East Othris massif (Greece): Implications for metallogeny and deformation of chromitites within the lithospheric mantle portion of a forearc-type ophiolite[J]. CHEMIE DER ERDE-GEOCHEMISTRY,2019,79(1):130-152.
APA	Kapsiotis, Argyrios.,Economou-Eliopoulos, Maria.,Zheng, Hao.,Su, Ben-Xun.,Lenaz, Davide.,...&Xia, Bin.(2019).Refractory chromitites recovered from the Eretria mine, East Othris massif (Greece): Implications for metallogeny and deformation of chromitites within the lithospheric mantle portion of a forearc-type ophiolite.CHEMIE DER ERDE-GEOCHEMISTRY,79(1),130-152.
MLA	Kapsiotis, Argyrios,et al."Refractory chromitites recovered from the Eretria mine, East Othris massif (Greece): Implications for metallogeny and deformation of chromitites within the lithospheric mantle portion of a forearc-type ophiolite".CHEMIE DER ERDE-GEOCHEMISTRY 79.1(2019):130-152.