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SABZEVAR COMPLEX OPHIOLITE PETROLOGY AND ITS RELATION TO THE CHROMITE DEPOSITION

AUTHOR/S: HEZARKHANI, A.
Sunday 1 August 2010 by Libadmin2005

5th International Scientific Conference - SGEM2005, www.sgem.org, SGEM2005 Conference Proceedings/ ISBN: 954-918181-2, June 13-17, 2005, 31- 38pp

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.

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