干旱区生态环境知识资源中心(Arid): Petrogenesis of arc-related peridotite hosted chromitite deposits in Sikhoran-Soghan mantle section, South Iran: Evidence for proto-forearc spreading to boninitic stages

Arid

DOI	10.1016/j.oregeorev.2021.104256
	Petrogenesis of arc-related peridotite hosted chromitite deposits in Sikhoran-Soghan mantle section, South Iran: Evidence for proto-forearc spreading to boninitic stages
	Sepidbar, Fatemeh; Khedr, Mohamed Zaki; Ghorbani, Mohammad R.; Palin, Richard M.; Xiao, Yilin
通讯作者	Sepidbar, F (corresponding author), Damghan Univ, Sch Earth Sci, Damghan, Iran.
来源期刊	ORE GEOLOGY REVIEWS
ISSN	0169-1368
EISSN	1872-7360
出版年	2021
卷号	136
英文摘要	The Soghan-Sikhoran ophiolite in southeast Iran (Outer Zagros Ophiolite Belt) is a remnant of a series of Upper Triassic-Cretaceous supra-subduction zone (SSZ) ophiolites that formed along the Zagros suture zone, which is considered as the southern border of the Neo-Tethyan sea. These SSZ ophiolites are older than the Late Cretaceous Zagros ophiolites. The main part of the Soghan-Sikhoran ophiolite comprises layered ultramafic cumulates including dunites, wehrlites, and pyroxenites, and a tectonized mantle section including residual lherzolites, and depleted harzburgites with foliated/discordant dunite lenses. Podiform chromitites are common and are typically surrounded by thin dunitic haloes. Spinels in lherzolite-harzburgite are geochemically characterized by a low Cr# (42.0 to 52.6), and plot in an abyssal peridotite field on geochemical discrimination diagrams, whereas spinel in dunites and high-Cr chromitite spinels (Cr# = 52.4 to 76.4) show geochemical affinities to boninites. Lherzolites and harzburgites have low REE contents and experienced >17 vol% partial melting. The SoghanSikhoran ophiolite contains both high Cr# and low Cr# podiform chromitite types. Trace and REE element patterns of Soghan-Sikhoran rocks are similar to those in SSZ peridotites. The studied ophiolites show relatively moderate to high oxygen fugacities (fO(2)), with log units ranging from 0.4 to +0.4 for harzburgites, +0.2 for lherzolites, from 0.7 to + 2.5 for pyroxenites, from +0.8 to +2.2 for dunites, and from + 0.6 to + 0.8 for chromitites. The moderate to high oxidation state of the studied upper-mantle ophiolitic complexes also suggests a boninitic source in the mantle wedge of the arc setting. The two-pyroxene thermometer yields mean equilibrium temperatures of 879 degrees C, 895 degrees C, 912 degrees C and 912 degrees C for harzburgites, lherzolites, dunites and pyroxenites, respectively. We therefore interpret that the spinels in the lherzolite-harzburgite crystallized from tholeiitic melt generated due to proto-forearc spreading and formation of the infant arc, whereas high-Cr# spinel in dunites and high-Cr# chromitite crystallized from boninitic melts during the mature arc stage, with an increasing contribution of slab-derived fluids at high fO(2).
英文关键词	Proto-forearc Boninite melt Soghan-Sikhoran ophiolite Podiform chromitites
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000671825100001
WOS关键词	SPINEL OXYGEN GEOBAROMETER ; MAFIC-ULTRAMAFIC COMPLEX ; ABYSSAL PERIDOTITES ; EASTERN DESERT ; OMAN OPHIOLITE ; PODIFORM CHROMITITES ; CHEMICAL VARIATIONS ; EGYPT EVIDENCE ; SUTURE ZONE ; HIGH-CR
WOS类目	Geology ; Mineralogy ; Mining & Mineral Processing
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
来源机构	University of Oxford
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351245
作者单位	[Sepidbar, Fatemeh] Damghan Univ, Sch Earth Sci, Damghan, Iran; [Khedr, Mohamed Zaki] Kafrelsheikh Univ, Fac Sci, Dept Geol, Kafr Al Sheikh, Egypt; [Ghorbani, Mohammad R.] Tarbiat Modares Univ, Dept Geol, Tehran 14115175, Jalal Al Ahmad, Iran; [Palin, Richard M.] Univ Oxford, Dept Earth Sci, Oxford OX1 3AN, England; [Xiao, Yilin] Univ Sci & Technol China, Sch Earth & Space Sci, Dept Geochem & Environm Sci, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Sepidbar, Fatemeh,Khedr, Mohamed Zaki,Ghorbani, Mohammad R.,et al. Petrogenesis of arc-related peridotite hosted chromitite deposits in Sikhoran-Soghan mantle section, South Iran: Evidence for proto-forearc spreading to boninitic stages[J]. University of Oxford,2021,136.
APA	Sepidbar, Fatemeh,Khedr, Mohamed Zaki,Ghorbani, Mohammad R.,Palin, Richard M.,&Xiao, Yilin.(2021).Petrogenesis of arc-related peridotite hosted chromitite deposits in Sikhoran-Soghan mantle section, South Iran: Evidence for proto-forearc spreading to boninitic stages.ORE GEOLOGY REVIEWS,136.
MLA	Sepidbar, Fatemeh,et al."Petrogenesis of arc-related peridotite hosted chromitite deposits in Sikhoran-Soghan mantle section, South Iran: Evidence for proto-forearc spreading to boninitic stages".ORE GEOLOGY REVIEWS 136(2021).