J. S. R. Krishna Rao

Research Field

The chromite occurs as lenses and pockets in pyroxenite bands in charnockite. Detailed petrographic study of the ores and associated rocks shows that the chromite is neither genetically associated with the charnockite, nor of late magmatic hydrothermal origin, as has been suggested. Two types of chromite are recognized. One formed earlier than olivine; the other, the main ore mineral, is more or less contemporaneous with the pyroxene of the primary ultramafic rock. Pyrrhotite-pentlandite, magnetite-hematite, and sphalerite are products of later mineralization.

Chromite

10.2113/gsecongeo.59.4.678

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Citations (4)

Occurrence of High Uranium-Bearing Granitic Gneisses Near Narsipatnam, Vishakhapatnam District, A. P

Journal of the Geological Society of India (1974)

B. Satyanarayana J. S. R. Krishna Rao

Granitic rock

Uranium ore

10.17491/jgsi/1974/150116

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Occurrence and origin of graphite in parts of Eastern Ghats, south India

Economic Geology (1965)

J. S. R. Krishna Rao V. Malleswara Rao

Graphite is disseminated as flakes, needles, and granules in gneisses and schists of various localities of the Eastern Ghats range, and is flaky to compact in veins that are generally concordant. It is associated with sulfides, manganese and iron oxides, calcite, and metamorphic silicates. The graphite in gneiss is believed to represent original syngenetic carbonaceous material, and the veins are attributed to concentration by hydrothermal solutions.

10.2113/gsecongeo.60.5.1046

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Citations (8)

Origin of iron ores of Kemmangandi, Bababudan Hill ranges of Mysore state, India

Economic Geology (1969)

C. Anjaneya Sastry D. S. N. Murthy J. S. R. Krishna Rao

10.2113/gsecongeo.64.2.202

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Citations (2)

Microscopic examination of manganese ores of Srikakulam and Visakhapatnam (Vizagapatam) districts, Andhra Pradesh, India [discussion]

Economic Geology (1964)

J. S. R. Krishna Rao

10.2113/gsecongeo.59.1.154

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Genesis of Lead-Copper Ores in Agnigundala Area Andhra Pradesh

Journal of the Geological Society of India (1974)

J. S. R. Krishna Rao R. Dhana Raju

Lead (geology)

10.17491/jgsi/1974/150302

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Ore Microscopic, X-Ray and Trace Elemental Studies of a few Iron Ores from South India

Journal of the Geological Society of India (1970)

C. Anjaneya Sastry J. S. R. Krishna Rao

TRACE (psycholinguistics)

10.17491/jgsi/1970/110304

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Citations (4)

A Sedimentological Study of Manganese Powder from Devada, Srikakulam District, Andhra Pradesh

Journal of the Geological Society of India (1972)

R. Dhana Raju J. S. R. Krishna Rao

10.17491/jgsi/1972/130204

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Native nickel-iron alloy, its mode of occurrence, distribution and origin

Economic Geology (1964)

J. S. R. Krishna Rao

Native nickel-iron as awaruite, souesite, josephinite occurs in serpentinized peridotites belonging to Alpine orogeny. New localities for the mineral are listed, the diagnostic properties enumerated and the paragenetic sequence as suggested by the ore microscopic methods is given. The mineral or mineral group is suggested to have originated by reduction of the nickel-bearing silicates or sulfides during serpentinization of the peridotites.

Mode (computer interface)

10.2113/gsecongeo.59.3.443

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Citations (34)

The lateritic iron ores, itabiritic quartzites and epidiorites of the Kemmangundi area, Bababudan hills, Mysore state, India

Mineralium Deposita (1971)

J. S. R. Krishna Rao D. S. N. Murthy

Petrochemistry

10.1007/bf00208033

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Citations (1)