DOI: 10.1007/s00531-015-1187-x
Scopus记录号: 2-s2.0-84958054876
论文题名: Emplacement of serpentinites in the Chohar Gonbad-Gugher-Baft ophiolitic mélange, southeast Iran: examination of the mineral–chemical, petrologic, and structural features
作者: Mohammadi N. ; Ahmadipour H. ; Lentz D.R. ; Shafaii Moghadam H.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2016
卷: 105, 期: 2 起始页码: 537
结束页码: 555
语种: 英语
英文关键词: Harzburgite
; Iran
; Nain-Baft
; Ophiolite mélange
; Serpentinite
; Southern Sanandaj–Sirjan zone
Scopus关键词: emplacement
; harzburgite
; igneous geochemistry
; melange
; mineralogy
; ophiolite
; petrology
; serpentine
; thrust
; Iran
; Sanandaj-Sirjan Belt
英文摘要: The Chohar Gonbad-Gugher-Baft ophiolite mélange, located along the major Baft and Shahr-e-Babak fault zones, southeast Iran, represents remnants of Neo-Tethyan oceanic lithosphere. This mélange contains blocks of harzburgite, dunite, lherzolite, basalt, and other ophiolite-related lithologies tectonically mixed with and embedded in a serpentinite matrix. Field, petrographic, and geochemical data show that peridotites in this mélange belong to the upper mantle. They seem to have undergone up to ~20 % partial melting in a supra-subduction zone setting, based on their spinel Cr# values (0.21–0.53). Chemical compositions and textures in the serpentinites indicate that they were partially hydrated during emplacement and further mobilized diapirically to the surface. The different deformation stages occurred in an accretionary wedge environment. Petrographic evidence shows that the first serpentinization event produced mesh-textured serpentinites formed under static conditions in an ocean floor environment (Nain-Baft ocean crust), where the initial lizardite, bastite, and chrysotile veins formed. Plastic deformation occurred due to the subduction of Nain-Baft oceanic lithospheric beneath the central Iranian microcontinent, with antigorite-bearing flare-textured serpentinites produced. During progressive exhumation of the Nain-Baft ophiolite mélange, the serpentinites were affected by ductile, ductile–brittle, and brittle deformation, respectively. Accretion and resultant diapirism are the most important processes in the emplacement of serpentinite, which is a consequence of hydration of the ocean crust. In this example, late-stage emplacement via thrusting occurred along the northern extent of the southern Sanandaj–Sirjan zone (S–SZ). © 2015, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84958054876&doi=10.1007%2fs00531-015-1187-x&partnerID=40&md5=0070a00dfa34714883e51e11d7c28360
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70199
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth Sciences, University of New Brunswick, 2 Bailey Drive, Fredericton, NB, Canada; Department of Geology, Shahid Bahonar University of Kerman, Kerman, Iran; School of Earth Sciences, Damghan University of Basic Sciences, Damghan, Iran
Recommended Citation:
Mohammadi N.,Ahmadipour H.,Lentz D.R.,et al. Emplacement of serpentinites in the Chohar Gonbad-Gugher-Baft ophiolitic mélange, southeast Iran: examination of the mineral–chemical, petrologic, and structural features[J]. International Journal of Earth Sciences,2016-01-01,105(2)