Clinopyroxenite xenoliths from the Deccan Trap lavas of Kutch and Mumbai

摘要

Only a few occurrences of mantle xenoliths have been reported in the Deccan basalt province. These include the spinel peridotite and spinel Iherzolite from Kutch and clinopyroxenite (with minor olivine) from Murud-Janjira coast. We now report hitherto unknown clinopyroxenite xenoliths from Kutch and Powai. The Kutch xenoliths are accidental and the Powai xenoliths are cognate. The Kutch clinopyroxenite xenoliths appear to have been formed due to the reaction between the mantle, containing olivine and orthopyroxene, and carbonated alkaline magma at about 1100 degrees C and 17 kb pressure. The Powai xenolith represents cumulates of clinopyroxenes in the magma chamber which were picked up and brought up by a subsequent eruption. [References: 13]