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Geology, petrology and tectonomagmatic evolution of the plutonic crustal rocks of the Sabzevar ophiolite, NE Iran

Published online by Cambridge University Press:  21 March 2013

MORTEZA KHALATBARI JAFARI ,
HASSAN A. BABAIE  and
MOJTABA MIRZAIE
MORTEZA KHALATBARI JAFARI*
Affiliation:
Research Institute for Earth Sciences, Geological Survey and Mining Exploration of Iran, Tehran, Iran
HASSAN A. BABAIE
Affiliation:
Department of Geosciences, Georgia State University, Atlanta, GA 30302, USA
MOJTABA MIRZAIE
Affiliation:
Research Institute for Earth Sciences, Geological Survey and Mining Exploration of Iran, Tehran, Iran
*
†Author for correspondence: khalat1965@live.com
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Abstract

The plutonic crustal sequence exposed northeast of Sabzevar is part of the ophiolitic belt of Sabzevar that occurs along the northern margin of the Central Iran micro-continent. The sequence includes olivine and pyroxene gabbro with cumulate characteristics, isotropic gabbro, foliated gabbro and a diabase sheeted dyke complex cut by wehrlite and olivine websterite intrusions, and pegmatite gabbro and plagiogranite as small intrusions and dykes. The sequence is comparable to gabbros in known ophiolite complexes. Microscopic studies show an abundance of the mesocumulate and heteradcumulate textures that represent open system magma chambers, which are common in supra-subduction zones. The olivine → plagioclase → clinopyroxene → ± orthopyroxene → amphibole trend of mineralization in the gabbros, similar to mid-ocean ridge basalt (MORB), and olivine → clinopyroxene → ± orthopyroxene → plagioclase → amphibole, similar to arc rocks, indicate the diversity in the formation of these rocks, and represent petrographic evidence of their formation in a supra-subduction zone. The rocks have calc-alkaline to tholeiitic affinities, and niobium depletion in the spider diagrams of diabase that matches the patterns of island arc magma. These patterns, and the light rare earth element enrichment of the diabase and plagiogranite, suggest the effect and introduction of the fluids, originating from the subducting slab, beneath the mantle wedge. The low titanium compositions, matching those of arc diabase and plagiogranite, plot in the island arc to MORB tectonomagmatic fields, and suggest formation of the Sabzevar ophiolitic plutonic crustal sequence in a supra-subduction zone during Late Cretaceous time.

Keywords

gabbrocumulatemesocumulateheteradcumulateMORBsupra-subduction
Type
Original Articles
Information
Geological Magazine , Volume 150 , Issue 5 , September 2013 , pp. 862 - 884
Copyright
Copyright © Cambridge University Press 2013 

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