Geochemistry and geodynamic setting of crustal sequence in Shahini ophiolitic complex (NW of Kamyaran)

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RAHIMZADEH BAHMAN; VEISINIA AYOUB; EBRAHIMI MOHAMMAD; Esmaieli Rasoul

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Journal: PETROLOGY Year:2019 | Volume:10 | Issue:39 Page(s): 101-130

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Title

Geochemistry and geodynamic setting of crustal sequence in Shahini ophiolitic complex (NW of Kamyaran)

Author(s)

RAHIMZADEH BAHMAN | VEISINIA AYOUB | EBRAHIMI MOHAMMAD | Esmaieli Rasoul | Issue Writer Certificate

Keywords

geochemistryQ1

ophiolitic crustal sequenceQ1

suprasubductionQ1

NW KamyaranQ1

ZagrosQ2

Abstract

The Shahini ophiolitic complex in the west of Iran and northwest of Kamyaran, as a ring connection between the Kermanshah and the Kurdistan ophiolites exposed along the Zagros and the Neotethys suture zone. The complex contains the mantle peridotites and the crustal sequence. The peridotites with cpx-bearing harzburgite and lherzolite are serpentinized and cross cut by isolated diabasic dikes. The crustal sequence consists of pegmatitic and isotropic gabbros, microgabbroic dykes, basalt and pyroclastic andesite. The sedimentary-volcanic sequence is dominated by radiolarite, shale, pelagic limestones, sandstone and tuff horizons covering the extrusive sequence. Based on chemical analyses, the crustal sequence ranges in composition, from tholeiitic to calcalkaline. On the tectonomagmatic diagrams these rocks are mainly plotted on the MORB field and occasionlly, are clustered in the volcanic arc region. The LILE enrichment, slight depletion in HFSE as well as the enrichment of some LREEs along with linear trends of HREE suggest that the parent magma originated in the arc environment from the heterogeneous mantle with varying degrees of partial melting. However, the low ratios of Th/Yb, La/Nb, Ce/Nb and Ce/Th indicate the tendency between the IAB and MORB environments. The depth of partial melting estimated at the depth of 50 to 60 km representing the partial melting of spinel lherzolite mantle. Field relationships and geochemical evidences indicate that the Kamyaran ophiolites formed in oceanic basin in the ocean-continent borders zone in the north portion of the Neotethys Ocean.

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APA: Copy

RAHIMZADEH, BAHMAN, VEISINIA, AYOUB, EBRAHIMI, MOHAMMAD, & Esmaieli, Rasoul. (2019). Geochemistry and geodynamic setting of crustal sequence in Shahini ophiolitic complex (NW of Kamyaran). PETROLOGY, 10(39 ), 101-130. SID. https://sid.ir/paper/384422/en

Vancouver: Copy

RAHIMZADEH BAHMAN, VEISINIA AYOUB, EBRAHIMI MOHAMMAD, Esmaieli Rasoul. Geochemistry and geodynamic setting of crustal sequence in Shahini ophiolitic complex (NW of Kamyaran). PETROLOGY[Internet]. 2019;10(39 ):101-130. Available from: https://sid.ir/paper/384422/en

IEEE: Copy

BAHMAN RAHIMZADEH, AYOUB VEISINIA, MOHAMMAD EBRAHIMI, and Rasoul Esmaieli, “Geochemistry and geodynamic setting of crustal sequence in Shahini ophiolitic complex (NW of Kamyaran),” PETROLOGY, vol. 10, no. 39 , pp. 101–130, 2019, [Online]. Available: https://sid.ir/paper/384422/en

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