1�� College of Earth Sciences��Jilin University��Changchun 130061��China; 2�� Geological Survey and Mineral Resources Board��Sana'a��Yemen

The Wadi Sharis orogenic gold deposit in northwestern Yemen is related to the fault and shear zones vein at medium depth in the crust in the Neoproterozoic meta-sedimentary and meta-volcanosedimentary succession of greenschist to amphibolite facies metamorphism�� Three distinct fluid inclusion types have been identified in the gold-bearing quartz sulphide veins of the deposit: ( 1) type I: vapour-liquid two-phase ( VH2O �� LH2O ) �� ( 2) type II: three-phase CO2 ( VCO2 �� LH2O �� LCO2 ) and ( 3) type III: vapour-rich ( LCO2 �� VCO2 ) inclusions�� Six analysis of individual fluid inclusion indicate the fluid inclusions comprise mainly of H2O and CO2 �� Formation P-T conditions recorded by fluid inclusions in quartz crystals correspond to 180��-380�� and up to 130 MPa��as indicated by high-density CO2 bubbles ( up to 0. 98 g /cm3 ) observed in some inclusions�� The estimated crystallization pressures correspond to approximately 4-10 km of overburden��assuming a lithostatic load�� The salinity ranges from 0 to 22 wt%�� The deposit holds at 0. 2-5 g /t Au and contains low-moderate salinity��