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Petrogenesis of the Harsin-Sahneh serpentinized peridotites along the Zagros suture zone, western Iran; new evidence for mantle metasomatism due to oceanic slab flux

Fatemeh Nouri, Yoshihiro Asahara, Hossein Azizi and Motohiro Tsuboi
Petrogenesis of the Harsin-Sahneh serpentinized peridotites along the Zagros suture zone, western Iran; new evidence for mantle metasomatism due to oceanic slab flux
Geological Magazine (May 2019) 156 (5): 772-800

Abstract

The Harsin-Sahneh serpentinized peridotites are widely exposed along the Zagros suture zone in the western region of Iran and are considered to represent remnants of Neo-Tethys oceanic lithosphere at the junction of the Arabian and Iran Plates. These rocks are characterized by low contents of SiO (sub 2) (38.8-43.5 wt%), Al (sub 2) O (sub 3) (0.1-3.8 wt%), CaO (0.2-8.2 wt%) and TiO (sub 2) (<1 wt%) and high MgO contents (31.1-46.0 wt%). Their enrichments of large ion lithophile elements and light rare earth elements, with high (super 87) Sr/ (super 86) Sr (sub (i)) values (0.7036-0.7109) and relatively high variations in their epsilon Nd (sub (t)) (-7.5 to +7.8) values, indicate that the Harsin-Sahneh peridotites were metasomatized by flux released from the oceanic subducting slab in an active margin. The chemical compositions and isotopic ratios of these rocks suggest that they were formed as residue of mid-oceanic ridge basalt in the lithosphere that was then subsequently re-melted and metasomatized in a supra-subduction zone system. The occurrence of both mid-oceanic ridge and supra-subduction zone-type peridotites suggests that the heterogeneity of the upper mantle may have occurred due to the different ratios of partial melting and melt-rock reaction processes in different tectonic settings within the Neo-Tethys realm. The Harsin-Sahneh peridotites provide a good explanation of multistage melt extraction as well as melt-rock and metasomatic reactions in the mantle sequence of the Zagros ophiolite complex.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 156
Serial Issue: 5
Title: Petrogenesis of the Harsin-Sahneh serpentinized peridotites along the Zagros suture zone, western Iran; new evidence for mantle metasomatism due to oceanic slab flux
Affiliation: University of Kurdistan, Mining Department, Faculty of Engineering, Sanandaj, Iran
Pages: 772-800
Published: 201905
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 182
Accession Number: 2019-062042
Categories: Solid-earth geophysicsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
N34°00'00" - N34°30'00", E47°30'00" - E48°00'00"
Secondary Affiliation: Nagoya University, JPN, JapanKwansei Gakuin University, JPN, Japan
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201932
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