Soil and stream sediment based geochemical mapping: A case study in Goa

Abstract

Geochemical mapping has been carried out in Goa using soil/laterite and stream sediment as media. The geochemical maps for U, Th, Nb and Ta show a conspicuous pattern in the NW part of Goa. The anomaly axis shows a NE-SW trend which is across the formational trend. The nickel and copper distribution around Usgaon area, east of Ponda, have indicated anomalous signature in the northern continuation of the Usgaon ultramafic complex.

Geochemical and mineralogical analysis of stone anchors from west coast of India: provenance study using thin sections, XRF and SEM-EDS

“…Along the northern WCI, (Maharashtra and Gujarat) Deccan Trap basalts, miliolite limestones and fossiliferous limestones of Quaternary age and fossiliferous sedimentary rocks of Tertiary sequence are exposed. In the central WCI, (particularly Goa) laterite cliffs are present with a few locations having metamorphosed sequence of metagreywacke and quartzites (Gokul et al, 1985;Purushothaman et al, 2009) while Deccan Trap basalts line the coast with alkaline complexes at few locations (Deshpande, 1998). The southern WCI (Kerala and Karnataka) has rock suites of granites, schists, granitic and gneissic complexes with localised exposures of Pleistocene sequence (Soman, 2002) (Fig.…”

“…Map showing the exposure of rocks along Goa (afterPurushothaman et al, 2009) and dikes(after Widdowson et al, 2000); Gujarat (afterMerh, 1995); Maharashtra and Karnataka (afterRadhakrishna and Vaidyanadhan, 1994) coastal tract.…”