Mohamed El Tokhi* and Abdulla Musallam
Geology Department, College of Science, United Arab Emirates University. United Arab Emirates

Abstract Calcite and quartz veins in the gabbroic and dunite rocks of the Semial ophiolite (UAE) were selected for fluid inclusion analysis. The inclusions contain both aqueous low-salinity and hydrocarbon-dominated fluids. Microthermometry data indicate that the aqueous fluids contain 0.22 to 1.45 equivalent wt% NaCl and occasionally contain traces of hydrocarbons. Homogenization to liquid occurred between 91 and 152℃. Modeling based on these fluid inclusion observations indicates that the trapping conditions of the studied rocks were subjected to temperatures of 162 and 172℃, occasional pressures of 610–710 Pa and the sequence percolation of aqueous and hydrocarbon fluids. 

Key words  mafic; ultramafic; fluid inclusion; hydrocarbon; vein; UAE

* Corresponding author, E-mail: meltokhi@uaeu.ac.ae

CHINESE JOURNAL OF GEOCHEMISTRY  Vol. 30, No. 3, 2011, page 290-294

© Science Press and Institute of Geochemistry, CAS and Springer-Verlag Berlin Heidelberg 2011