Emplacement of Carbonatite and Associate Rocks of Siriwasan Carbonatite Complex, Gujarat: Evident by Field Relationship and Petrology

Abstract

The Siriwasan carbonatite complex is situated in the western part of Deccan Basalt Province and belongs to Chhota Udepur carbonatite-alkaline sub-province. The area consist a variety of rock types including sedimentary rocks of Bagh Group (sandstone, limestone and shale), Deccan basalts, carbonatized sandstone, pyroclastic rocks, carbonatite breccia, carbonatites (Alvikite and Sovite), tinguaite, trachyte and dolerite. The detailed field studies and petrography of the carbonatites and associated rocks of the area concluded that there should be at least two episodes of carbonatitic magmatism of different ages. The older episode was extrusive coupled with intrusive dykes and the later event was intrusive only. The tinguaite is older than Deccan basalts while the trachyte and dolerite are younger rock units.