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Sarma, K. V. L. N. S.
- Petrophysical Studies on Metabasics of the Sanko-Kargil Area, Kashmir Himalaya
Abstract Views :173 |
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.
- Application of Inversion Techniques on Marine Magnetic Data - Andaman Shelf
Abstract Views :215 |
PDF Views:1
Authors
K. V. L. N. S. Sarma
1,
M. V. Ramana
1,
G. P. S. Murty
1,
V. Subrahmanyam
1,
K. S. Krishna
1,
A. K. Chaubey
1,
M. M. Malleswara Rao
2,
S. L. Narayana
2
Affiliations
1 National Institute of Oceanography, Donapaula, Goa - 403004, IN
2 National Institute of Oceanography, Regional Centre, Visakhapatnam-530023, IN
1 National Institute of Oceanography, Donapaula, Goa - 403004, IN
2 National Institute of Oceanography, Regional Centre, Visakhapatnam-530023, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 44, No 1 (1994), Pagination: 73-78Abstract
Analysis of the total intensity magnetic data over the western Andaman shelf has been carried out for determination of depth to magnetic basement using the Analytical signal and Werner Deconvolution methods. The basement depths are refined with optimisation procedure of iteration modelling. The depths Derived from these methods match well with the acoustic basement mapped by the seismic reflection survey across the Andaman shelf. The interpretation by these methods demonstrates the rapid utility in virgin areas forderiving the first order basement configurationquickly. The gradual slope of the basement from west to east on the western Andaman shelf may be attributed to the ongoing process of the subduction of the older crust in the Sunda Trough.Keywords
Marine Geophysics, Andaman Sea.- Marine Magnetic Studies Over a Lost Wellhead in Palk Bay, Cauvery Basin, India
Abstract Views :214 |
PDF Views:3
Authors
Affiliations
1 National Institute of Oceanography, Donapaula, Goa-403 004, IN
2 Oil and Natural Gas Commission, Sire Mansion, Mount Road, Madras-600 006, IN
1 National Institute of Oceanography, Donapaula, Goa-403 004, IN
2 Oil and Natural Gas Commission, Sire Mansion, Mount Road, Madras-600 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 45, No 2 (1995), Pagination: 201-208Abstract
Close grid masine magnetic surveys in the vicinity of a drill well site PH 9-1 in Palk Ray revealed that the area is characterized by smooth magnetic field except for a local anomaly caused by a lost wellhead. The smooth magnetic field is attributed to the deep burial of Precambrian granitic basement devoid of any charnockite intrusions. The seismic reflection records of the study area show >3200 m thick sediments over the basement.Keywords
Marine Geology, Geophysics, Palk Bay, Cauvery Basin.- Qualitative Assessment of Tectonic Lineaments over the Coastal and Innershelf of Kakinada and Kalingapatnam, Central East Coast of India
Abstract Views :160 |
PDF Views:2
Authors
A. S. Subrahmanyam
1,
G. P. S. Murty
1,
K. V. L. N. S. Sarma
1,
K. Mohana Rao
1,
N. P. C. Reddy
1,
M. M. Malleswara Rao
1,
V. Subrahmanyam
1,
P. Suneetha Rani
1,
A. Anuradha
1,
K. S. R. Murthy
1
Affiliations
1 National Institute of Oceanography, 176, Lawson's Bay Colony, Visakhapatnam- 530 017, IN
1 National Institute of Oceanography, 176, Lawson's Bay Colony, Visakhapatnam- 530 017, IN