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Nambiar, C. G.
- Gravity Bases Established by Cochin University of Science and Technology (CUSAT) over Parts of Northern Kerala
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Authors
Affiliations
1 Department of Marine Geology and Geophysics, Cochin University of Science and Technology, Cochin - 682 016, IN
2 Department of Geophysics, Osmania University, Hyderabad - 500 007, IN
1 Department of Marine Geology and Geophysics, Cochin University of Science and Technology, Cochin - 682 016, IN
2 Department of Geophysics, Osmania University, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 3 (1998), Pagination: 393-398Abstract
A network of 30 gravity base stations have been established. The dynamic drift curves show an average drift rate of less than 0.006 mgal/min. The observed gravity values have repeatability of 0.08 mgal, and can be used for regional gravity surveys.Keywords
Geophysics, Gravity Base Staions, Kerala.
- Petrogenesis of the Perinthatta Anorthosite, Northern Kerala, India
Abstract Views :185 |
PDF Views:2
Authors
Affiliations
1 Department of Marine Geology and Geophysics, Cochin University of Science & Technology, Cochin - 682 016, IN
1 Department of Marine Geology and Geophysics, Cochin University of Science & Technology, Cochin - 682 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 4 (1997), Pagination: 501-509Abstract
The anorthosite pluton has textural and trace element characteristics typical of a magmatic cumulate. A soda-rich intermediate magma is inferred to be the parent. Rare earth element based modelling shows that the anorthosite was derived from a parental melt having hundred times chondritic REE with a slightly fractionated pattern probably derived by the melting of granulitic or edogitic source.Keywords
Petrogenesis, Anorthosite, Proterozoic Magmatism, Kerala.- Rare Earth Element Geochemistry of Modern Detrital Sediments from Chaliyar River, Northern Kerala
Abstract Views :189 |
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Authors
Affiliations
1 Department of Marine Geology and Geophysics, Cochin University of Science and Technology, Fine Arts Avenue, Cochin-682016, IN
1 Department of Marine Geology and Geophysics, Cochin University of Science and Technology, Fine Arts Avenue, Cochin-682016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 52, No 2 (1998), Pagination: 213-217Abstract
∑REE in the detrital sediments from Chaliyar river channel ranges from 37.7 to 65.5 ppm, which is around 0.3 times that of the average crust and NASC, and is lower compared to that of their provenance rocks. The highly fractionated chondrite-normalized REE pattern of the average sediment mimics that of the average provenance rock. but for the presence of a negative europium anomaly that is suggestive of preferential removal of plagioclase during weathering. The similarity in the REE contents of samples from different locations in the main channel reflects the immobility of rare earths in fluvial transportation and tectonic stability of the basinKeywords
Sedimentology, Geochemistry, Rare Earth Elements, Detrital Sediments, Kerala.- Interpretation of Gravity Field Over the Perinthatta Anorthosite, Northern Kerala
Abstract Views :185 |
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Authors
Affiliations
1 Department of Marine Geology and Geophysics, Cochin University of Science and Technology, Cochin - 682 016, IN
2 Department of Geophysics, Osmania University, Hyderabad - 500 007, IN
1 Department of Marine Geology and Geophysics, Cochin University of Science and Technology, Cochin - 682 016, IN
2 Department of Geophysics, Osmania University, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 5 (1999), Pagination: 483-490Abstract
Gravity surveys have been carried out over the Perinthatta anorthosite and the adjoining areas and the results are discussed. The Bouguer anomaly map reveals the absence of any conspicuous gravity anomaly corresponding to the pluton and thus precludes the existence of larger mafic portions of the pluton in the immediate subsurface region. The residual gravity map obtained by regional-residual separation method shows a minor positive gravity field of irregular shape with localised highs of 6 - 12 mgal within and around the anorthosite body. TWo-dimensional gravity interpretation of profiles across the pluton suggests subjacent nature and lensoid shape for the anorthosite which is underlain by small isolated cylindrical bodies (≃ 2.5 km diameter) of higher density (2.9 gm/cc) extending 3 - 7 km downwards. These cylindrical bodies are inferred as either the mafic/oxide rich portions of the pluton sagged down during crystallization or the individual feeders of the plagioclase-rich mushes, which coalesced in the upper crust to give rise to the massif.Keywords
Geophysics, Gravity, Anorthosite, Structure, Perinthatta, Kerala.- Some Geochemical and Petrogenetic Relations between Flows and Dykes of Deccan Trap from Chhaktalao Area, Madhya Pradesh
Abstract Views :183 |
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Authors
Affiliations
1 Govt. Arts and Science College, Durg - 491001, Chhattisgarh, IN
2 Dept. of Marine Geology and Geophysics, Cochin University of Science and Technology, Kochi - 682016, Kerala, IN
3 Dept. of Geosciences, Osaka City University, Osaka 558-8585, JP
1 Govt. Arts and Science College, Durg - 491001, Chhattisgarh, IN
2 Dept. of Marine Geology and Geophysics, Cochin University of Science and Technology, Kochi - 682016, Kerala, IN
3 Dept. of Geosciences, Osaka City University, Osaka 558-8585, JP