Evidence for an early-MORB to fore-arc evolution within the Zagros suture zone: Constraints from zircon U-Pb geochronology and geochemistry of the Neyriz ophiolite (South Iran)

doi:10.1016/j.gr.2018.03.002

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	Evidence for an early-MORB to fore-arc evolution within the Zagros suture zone: Constraints from zircon U-Pb geochronology and geochemistry of the Neyriz ophiolite (South Iran)
	Monsef, Iman 1; Monsef, Reza 2; Mata, Joao 3; Zhang, Zhiyong 4; Pirouz, Mortaza 5; Rezaeian, Mahnaz 1; Esmaeili, Rasoul 4,6; Xiao, Wenjiao 4
刊名	GONDWANA RESEARCH
	2018-10-01
卷号	62 页码:287-305
关键词	U-Pb dating Neo-Tethys Rollback Neyriz ophiolite Iran
ISSN号	1342-937X
DOI	10.1016/j.gr.2018.03.002
英文摘要	Late Cretaceous Neyriz ophiolite, as a part of the Outer Zagros Ophiolitic Belt, represents a remnant of the southern Neo-Tethyan oceanic lithosphere exposed along the Zagros suture zone in the south of Iran. Neyriz ophiolite is composed of dismembered lithological units including variably depleted mantle peridotites as well as intrusive and extrusive rocks preserving a geochemical evolution from mid-ocean ridge (MORB) to subduction-related (boninitic) signatures. Initially, the southern Neo-Tethyan oceanic lithosphere formed in the mid-ocean ridge spreading centre between the Arabian plate to the south west and the Eurasian plate to the north east. The inception of intra-oceanic subduction in the northern margin of the Arabian plate caused a slightly metasomatised supra-subduction-zone (SSZ) mantle lithosphere, producing MORB-like melts with a high degree of partial melting (-25-30%), and complementary depleted residual clinopyroxene (Cpx)-rich harzburgite. The zircon U-Pb geochronology for plagiogranite and gabbro intrusions reveals formation ages of 100.1 + 2.3 Ma to 93.4 1.3 Ma, respectively (Cenomanian). At a later stage, the rapid slab rollback and associated fore-arc spreading led to asthenospheric diapirism and arc-wedge mantle corner flow, which produced boninitic-like melts with advanced degrees of shallow partial melting (-35%), and ultra-depleted residual Cpx-poor harzburgites. The pervasive interaction between boninitic-like melts and refractory Cpx-poor harzburgites produced dunites as replacive lenses. Thus, this study postulates that Neyriz ophiolite formed from the Neo-Tethyan intra-oceanic subduction system, and preserves evidence of the evolution from an early-MORB oceanic crust to an extending fore-arc basin during subduction rollback processes. This tectonic environment is common in the Eastern Mediterranean region, where SSZ ophiolites have resulted in extended protoarc-forearc settings above subducted slabs. (C) 2018 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
资助项目	Chinese Academy of Sciences[GJHZ1776] ; Chinese Academy of Sciences[XDB03010801] ; National Natural Science Foundation of China[91755102] ; National Natural Science Foundation of China[41320104004] ; National Natural Science Foundation of China[41472192] ; Institute for Advanced Studies in Basic Sciences, Department of Earth Sciences[G2015IASBS11123] ; FCT through Institute Dom Luis (IDL), Universidade de Lisboa, Portugal[UID/GEO/50019/2013]
WOS关键词	SANANDAJ-SIRJAN ZONE ; IZU-BONIN-MARIANA ; OIB-TYPE COMPONENTS ; NEO-TETHYS ; KERMANSHAH OPHIOLITE ; SUBDUCTION INITIATION ; PERIDOTITE MASSIF ; KURDISTAN REGION ; METAMORPHIC SOLE ; OMAN OPHIOLITE
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000454185200018
资助机构	Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute for Advanced Studies in Basic Sciences, Department of Earth Sciences ; Institute for Advanced Studies in Basic Sciences, Department of Earth Sciences ; FCT through Institute Dom Luis (IDL), Universidade de Lisboa, Portugal ; FCT through Institute Dom Luis (IDL), Universidade de Lisboa, Portugal ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute for Advanced Studies in Basic Sciences, Department of Earth Sciences ; Institute for Advanced Studies in Basic Sciences, Department of Earth Sciences ; FCT through Institute Dom Luis (IDL), Universidade de Lisboa, Portugal ; FCT through Institute Dom Luis (IDL), Universidade de Lisboa, Portugal ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute for Advanced Studies in Basic Sciences, Department of Earth Sciences ; Institute for Advanced Studies in Basic Sciences, Department of Earth Sciences ; FCT through Institute Dom Luis (IDL), Universidade de Lisboa, Portugal ; FCT through Institute Dom Luis (IDL), Universidade de Lisboa, Portugal ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute for Advanced Studies in Basic Sciences, Department of Earth Sciences ; Institute for Advanced Studies in Basic Sciences, Department of Earth Sciences ; FCT through Institute Dom Luis (IDL), Universidade de Lisboa, Portugal ; FCT through Institute Dom Luis (IDL), Universidade de Lisboa, Portugal
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90249]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Monsef, Iman
作者单位	1.IASBS, Dept Earth Sci, Zanjan 4513766731, Iran 2.Islamic Azad Univ, Estahban Branch, Dept Geol, Estahban, Iran 3.Univ Lisbon, Fac Ciencias, Inst Dom Luiz, P-1749016 Lisbon, Portugal 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 5.CALTECH, Div Geol & Planetary Sci, Mc 100-23,1200 E Calif Blvd, Pasadena, CA 91125 USA 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Monsef, Iman,Monsef, Reza,Mata, Joao,et al. Evidence for an early-MORB to fore-arc evolution within the Zagros suture zone: Constraints from zircon U-Pb geochronology and geochemistry of the Neyriz ophiolite (South Iran)[J]. GONDWANA RESEARCH,2018,62:287-305.
APA	Monsef, Iman.,Monsef, Reza.,Mata, Joao.,Zhang, Zhiyong.,Pirouz, Mortaza.,...&Xiao, Wenjiao.(2018).Evidence for an early-MORB to fore-arc evolution within the Zagros suture zone: Constraints from zircon U-Pb geochronology and geochemistry of the Neyriz ophiolite (South Iran).GONDWANA RESEARCH,62,287-305.
MLA	Monsef, Iman,et al."Evidence for an early-MORB to fore-arc evolution within the Zagros suture zone: Constraints from zircon U-Pb geochronology and geochemistry of the Neyriz ophiolite (South Iran)".GONDWANA RESEARCH 62(2018):287-305.