A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Mallikarjuna, C.
- Carbonatite Dyke in Mysore State
Authors
1 Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 14, No 2 (1973), Pagination: 200-201Abstract
No Abstract.Full Text
- Konkanhundi Pluton: A New Layered Basic Intrusion from Karnataka
Authors
1 Jayanagar, Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 17, No 2 (1976), Pagination: 207-213Abstract
Konkanhundi pluton is the first recorded occurrence of a layered basic intrusion in Karnataka. It is an oval shaped mass having an area of 50km2 and is composed mainly of layered gabbro with cumulates of gabbro, norite and anorthosite, arranged concentrically. Non-layered norites are also conspicuous. Rhythmic layering is ubiquitous and cumulus textures are not uncommon. The pluton is emplaced into the gneissic complex of the Archaean high grade terrain. Subsequent to emplacement, it has been deformed and metamorphosed. It is considered to be a magmatic intrusion emplaced under plutonic conditions.
- Archaean Stromatolite Near Bhimasamudra, Karnataka
Authors
1 Geological Survey of India, Training Institute, Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 30, No 2 (1987), Pagination: 159-161Abstract
No Abstract.Full Text
- Archaean Meta Lamprophyres from Nuggihalli Schist Belt, Hassan District - Karnataka
Authors
1 Geological Survey of India, Jayanagar Shopping Complex, Bangalore - 560 011, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 43, No 2 (1994), Pagination: 115-137Abstract
The Archaean Dharwar greenstone belts of Karnataka predominantly consist of iron enriched tholeiitic Metabasalts, basaltic komatiites, sulphidic chert bands and argillite-graywacke sequence. In Nuggihalli schist belt, in association with mafic-ultramafic rocks, calc-alkaline lamprophyres (Spessartite-Kersantite suite), comparable with Kamblada-Yilgam of Western Australia, have been recorded for the first time. Gold mineralisation is associated with these meta-lamprophyres.
The lamprophyres, in Nuggihalli belt, is a highly banded hornblende-biotite rich quartzo-felspathic rock, forming sill like bodies at the contact of mafic-ultramafic rocks, intensely co-folded along with the enclosing rocks, recording three phases of deformation.
REE values, plotted against MORB values confirm lamprophyric affinity with increased values for Sr, K, Rb, Zr and Y. In Rock/Chondrite values plot, very pronounced increase in values of Ba, Rb, K, P, Zr and Ti is indicated while a pronounced depletion in Nb is brought out, characteristic of Calc-alkaline lamprophyres.
Search for similar rocks in many ultramafic belts in Southern Peninsular Shield will be of great Significance in working out the tectonic evolution ofthese greenstone belts and also serve as favourable target areas for gold exploration.