Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

H. Kariyanna ¹, Asit Saha ¹

Affiliations
1 Chinmayee Upparahally Extension, Tumkur-572102, Karnataka, IN

Abstract

Spinifex textured komatiitic basalt is noticed as an enclave in the Mothimakki mafic-ultramafic layered complex forming part of the North Kanara schist belt. The spinifex texture is represented by platy and skeletal crystals of olivine now altered to serpentine and magnetite. The komatiitic chemistry is supported by chemical analysis of a sample of the splnifex textured metabasalt.

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D. Purushothaman ¹, J. P. Mohakul ², Asit Saha ³, K. T. Vidyadharan ⁴, N. Rajendran ⁵

Affiliations
1 Geological Survey of India, Opn K&G, K.S. Layout, Bangalore - 560 078, IN
2 Geological Survey of India, Opn Orissa, Nayapalli, Bhubaneswar - 751 012, IN
3 Geological Survey of India, CHQ, 27 JLN Road, Kolkata - 700 016, IN
4 Geological Survey of India, Flat No-310, Block-B, Maharaja Residency, Mangalore -575 001, IN
5 Geological Survey of India, House No-367, Amarjyothi Layut, Domlur, Bangalore - 560 071, IN

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.

Keywords

Soil and Stream Sediment, Geochemical Mapping, Goa.

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