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SABZEVAR COMPLEX OPHIOLITE PETROLOGY AND ITS RELATION TO THE CHROMITE DEPOSITION

A. Hezarkhani

First published: 2005DOI pendingView metrics

Abstract

The Sabzevar complex ophiolite including igneous rocks consist of peridotites (lherzolite, dunite and harzburgite), serpentinite, gabbros and a volcanic sequence composed of basalts, andesites, rhyolites and basanites. Based on petrographic observations and geochemical analyses of incompatible trace and rare earth elements, three different types of extrusive rocks have been classified. a: Initial molten originated N-MORB-like basalts, which formed after a LREE depleted magmas, and are petrogenetically related to the gabbros, b) basaltic rocks which have similar E-MORB chemical composition, and c)basaltic rocks with LREE-enriched signatures and incompatible trace element patterns similar to island arc affinity. The data also suggest that the gabbros and the group “a” basaltic rocks are petrogenetically related and produced by fractionation of plagioclase and to a lesser extent clinopyroxene and hornblende. Sabzevar ophiolite demonstrate the presence of relics of mid ocean ridge basalt (MORB)-like signatures in the extrusive units of Neo-Tethyan ophiolites related to the fossil oceanic lithosphere, preserved in these ophiolitic areas. All of this rock unites could be the result of oceanic spreading center development activities. The differences between these rocks in terms of chemistry could be the result of a differing upper mantle composition. The presences of the volcanic rocks could be the result of extrusive activity following ophiolite emplacement.

Publication details

Title
SABZEVAR COMPLEX OPHIOLITE PETROLOGY AND ITS RELATION TO THE CHROMITE DEPOSITION
Authors
A. Hezarkhani
Proceedings
5th International Scientific Conference - SGEM2005
Publisher
SGEM Scientific GeoConference
Year
2005
Pages
31-38
ISSN
1314-2704
ISBN
954-918181-2
Language
en
Publication type
Conference Paper
Proceedings contents
Open official contents
References6

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