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Ramana, M. V.
- Marine Magnetic Profiles from the Direction Bank to the Kori Bank, Western Continental Shelf of India
Abstract Views :194 |
PDF Views:2
Authors
Affiliations
1 National Institute of Oceanography, Dona Paula, Goa 403 004, IN
1 National Institute of Oceanography, Dona Paula, Goa 403 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 4 (1986), Pagination: 352-358Abstract
Total magnetic field intensity measurements along two parallel NW-SE tracks from the Direction Bank to the Kori Bank show correlatable magnetic anomalies. High frequency positive anomalies observed northwest of Kathiawar coast terminating at about 21°N are interpreted due to the magnetic basement i.e, basalts at a depth of about 2 km. A low amplitude negative anomaly observed around 21°N (between 69°E and 70°E) may be due to the westward extension of the Narmada-Son lineament. Absence of significant anomalies south of these high frequency anomalies may be due to thin Traps or greater thickness of sediments. High amplitude and broad wavelength negative anomaly observed off Bombay (l9°N, 71.5°E) is interpreted as due to contact or faulting of Precambrian formations and Deccan Traps.- 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.- Marine Geophysical Studies off Karwar, West Coast of India
Abstract Views :201 |
PDF Views:2
Authors
Affiliations
1 National Institute of Oceanography, Dona Pau]a, Goa 403 004, IN
1 National Institute of Oceanography, Dona Pau]a, Goa 403 004, IN