Crude oils and condensates from major gas fields in the Surma basin, Bangladesh are of terrestrial origin, and are heavier due to abundant aromatics. The light hydrocarbon composition suggests that these are migrated vertically from deeper part of tha basin, and experienced evaporative fractionation. The maturity seems to be relatively higher, but some samples show the difference between maturity from light hydrocarbons and alkylphenanthrenes. The maturity diffrernce suggests the possibility of complex processes in the migration and accumulation of these crude oils and condensates.
Condensation of metallic iron and forsterite may have played a key role in chemical fractionation of Mg, Si, and Fe in the early solar system. We will report condensation kinetics of metallic iron and forsterite obtained in experiments under protoplanetary disk conditions.
Experimental partition coefficients for REE(III) between barite(BaSO4) and aqueous solution over the temperature range 10-200°C will be presented.Thermodynamic parameters for the REE partitioning reaction, including enthalpy and entropy changes, have been determined by the temperature change of the partition coefficients. Tetrad effects in enthalpy and entropy changes develop with increasing temperature.