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Volume :11 Issue : 1 1984      Add To Cart                                                                    Download

The structure and petrology of ultramafic and gabbroic rocks of Semail ophiolite in Al Fujayrah (United Arab Emirates) and their significance in the formation of cumulus and in situ crystallisation

Auther : JAWAD S. AL-SULAIMI

Kuwait Institute for Scientific Research, P.O. Box 24885, Safat, Kuwait

 

ABSTRACT

 

The study of the Oman ophiolite near Al-Fujayrah shows that the peridotites forming the lower part of the Semail ophiolite consists of harzburgite with dunite pods containing chromite. These dunite pods are interpreted as cumulate formed from partial melts as they rose upwards through the harzburgite residue. In the layered gabbros above, some banding is due to gravity settling; most is best explained by in situ crystallisation controlled by diffusion and nucleation rates at the crystal-liquid interface. The high-level gabbros above the banded sequence show different textures and more differentiated rocks.

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