Some NW-SE trending lineaments lie sub-parallel to the trend of the schist belt, commonly terminating some of the dykes of other orientations. However, opinions differ corresponding to island arc type bimodal volcanics and considerably in regard to details of convergence and their back arc rift basins containing volcano sedimentary evolution.
Geochemistry of charnockites from the eastern ghats Tectonophys. Shelf facies as in the other basins is confined to the western margin. Hydrothermal alteration in silicate rocks, southwestern North America in Titley, S. Karnataka is the only Indian state where felsite is produced.
The mineralogical properties of each mineral present in the sample are studied under reflected light and are given below. Another set of relatively well developed parallel thin dikes trend NE-SW. The districts of Bellary and Hospet are the main districts, whereas Chitradurga, Bagalkot and Tumkur districts are also produce significant amounts of iron ore.
Rose diagram showing the orientation of dykes and structural lineaments in different blocks around the schist belt: Comparison between the different band ratios techniques show a close correlation between iron altered zones which are also well known for Iron mineralisation.
These schist belts are also rich in base metal sequences. All the above features suggest that the tectonic forces between 2. Inset shows the location of Dharwar Craton. The structural fabric of the craton was well defined by then with the generation of NW-SE and NE-SW trending shear zone s forming a mosaic of block structure.
These small dykes in association with other dykes of the same orientation creates complex picture in order to classify the dykes in terms of location and orientation. Based on geochemical and geochronological data, three major episodes of dyke emplacement have been reported i.
Mafic Dyke swarms in the EDC are widespread and have intruded various lithologies such as gneisses, greenstone belts and granitoids. Primary gold mineralization produced chemical signature in the overburden and surrounding soil probably through weathering processes.
Similar observation was discovered at Bini Yauri and [ 29 ] suggested that magmatic fluid or recirculated groundwater may be part of the ore constituents at some stage of vein evolution and accompanied alteration. Rahaman and Grant suggested that there were several basins of deposition whereas Oyawoye and McCurry consider the schists belts as relicts of a single supracrustal cover.
Some of the E-W dykes are abruptly terminated at some of the inferred lineaments, which may represent shear zones. Gadag graywackes, on the other hand, appear to have had a predominantly volcanic source.
This was followed by production of band ratio imageries, where one band was divided on another based on their spectral response.
James H L Sedimentary facies of iron formations; Econ. It is, therefore likely that in this entire section of pp. Mapping of dykes through Remote sensing and aerial photographs has been proved to be a valuable tool in a Precambrian cratonic terrain.
The quartz veins were hosted by metapelites slate, phyllite and schist with metagabbro. Further it is not conformity with the suggestion that the extensive igneous activity around Cuddapah region in the form of dyke intrusion in the upper crust may be related to the basin evolution Chatterji and Bhattacharji, E-W trending dykes are predominant with a few N-S trending dykes and thin dykes are also relatively less Fig.
Samples O6 10 ppb of gold and O8 12 ppb of gold were recovered from the quartz veins that outcropped on the surface south of Maraya and west of River Ferri Ruwa, respectively.
The NW-SE striking foliation shows moderate to steep westerly dips. Based on field, mineralogical, and geochemical evidences, ore fluids may have been derived from fracturing, metamorphic dewatering, crustal devolatilization of sedimentary, gabbroic protoliths, and emplaced in an orogenic setting.
However, Pan-African event respectively. Chitradurga Nadigaddamalkapur and Turkandoni Raichur Kudligi Block Bellary & Chitradurga Manganese Chiknayakanhalli and Ramanguli area Tumkur Ramanguli area Uttar Kannada Barite Gadisankapura and Hungundkushtagi Schist Belt Bagalkot Clay Minerals/ Bentonite Coastal area Udupi Platinum Group of Elements [PGE].
Petrographic study of mafic-ultramafic lithosections of Jambur chromite mine in Nuggihalli Schist belt, Hassan district, Karnataka” are the results of the work carried out by me, under the guidance of Dr. B.
PRABHAKAR, Professor, Department of Geology, Bangalore University, Bangalore. extension of the Kolar Schist Belt. The average rain fall is about cm and realizes a temperature of to C temperatures.
Geological Setting Fig.3 Geological map of Southern extension Schist belt of Dharwar Craton The study area is located at the tail end of the Kolar Schist Belt from Chigargunta, Chittoor District.
Specialties: Structural mapping,petrographic characterisation,mineral investigation,geochemical mapping,elemental map production by surfer,stastical analysis and. 3 years of experience in geological mapping and mineral investigation for Gold(Chitradurga schist belt and shimoga schist belt, Karnataka, India), geochemical mapping in the state of Karnataka Title: Geologist.
New Zealand's ongoing tectonic deformation and metamorphism, diverse volcanic complexes, active geothermal systems, and classic schist belts provide a natural laboratory for the processes and controls involved in ore formation.Mineral mapping of the chitradurga schist belt