Refine your search
Collections
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
Ramana, Y. V.
- Geochemistry of Subsurface Hornblendic Rocks from Kolar and the Archaean Crustal Composition of the Peninsular Shield
Abstract Views :181 |
PDF Views:2
Authors
Affiliations
1 National Geophysical Research Institute. Hyderabad, IN
1 National Geophysical Research Institute. Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 17, No 2 (1976), Pagination: 245-251Abstract
Major and minor elemental analyses of the subsurface hornblendic schists, granulites and basalts from the Kolar schist belt, India (a Precambrian schist belt), suggest that the crust was mostly basic in the Archaean times and similar to tholeiitic basalt.- Petrophysical Studies on Metabasics of the Sanko-Kargil Area, Kashmir Himalaya
Abstract Views :168 |
PDF Views:2
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad 500007, IN
1 National Geophysical Research Institute, Hyderabad 500007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 22, No 7 (1981), Pagination: 316-325Abstract
Petrologically, the metabasites comprise of metavolcanics (metabasalt, spilitic basalt, metadolerite, spilitic diabase and trachybasalt), green schists, amphibolites and meta-greywackes, and of these the meta volcanics are the most predominant. The physical properties of these rocks are: density (2.77-3.00 g·cm-3), porosity (0.2-1.9%), compressional velocity (5-7 km·sec-1), shear velocity (3-4km·sec-1), P-anisotropy (up to 7.6%), compressive strength (700-2800kg cm-2), tensile strength (70-190 kg cm-2), Young's modulus (6.5-11.5 × 10-11 dynes·cm-2), and Poisson's ratio (0.14-0.29). These variations in the physical parameters are due to (i) Metamorphic effects (low to moderate P and T conditions, green schist-amphibolite facies), (ii) The serpentinization of the phenocryst minerals, (iii) The glassy nature of the groundmass, and (iv) The differences in the groundmass/phenocryst ratios.In general, the physical parameters of these crustal rocks from the Himalayas are higher than those of Deccan basalts even at ambient conditions. This is due to (i) Differences in their mineralogical characters, and (ii) The mode of their occurrence, the former being associated with highly folded, disturbed and tectonically affected eugeosynclinal zones, whereas the latter are of the fissure eruption type, relatively free from metamorphic effects and large scale tectonic activity.
- Petrophysics
Abstract Views :168 |
PDF Views:126
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad, IN
1 National Geophysical Research Institute, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 36, No 6 (1990), Pagination: 676-676Abstract
No Abstract.- B. S. Gogte (1933-1992)
Abstract Views :152 |
PDF Views:122
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad, IN
1 National Geophysical Research Institute, Hyderabad, IN