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
Biswas, S. K.
- A Note on the Mode of Eruption of the Deccan Trap Lavas with Special Reference to Kutch
Authors
1 Oil & Natural Gas Commission, Baroda, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 14, No 2 (1973), Pagination: 134-141Abstract
On the basis of detailed field mapping and available gravity data, certain conclusions regarding the mode of eruption of Deccan trap lavas are drawn.
In Kutch, the Deccan trap formation outcrops along the western and southern periphery of the mainland. The trap flows which rest disconformably over the Mesozoic rocks, are also seen to cover the eroded Mesozoic structures. They thin out towards the central and northern hills of folded Mesozoic rocks. Whereas basic dykes and sills are concentrated in these fold zones, a number of plugs occur close to the Deccan trap outcrops. Igneous plugs, seem to be related more to the trap than the tectonism. The dykes and sills are probably syntectonic whereas the trap flows are post-tectonic with respect to the Mesozoic folding. Three volcanic cone-like structures have also been discovered at the fringe of the Deccan trap outcrop, near Jada and Wehar. It is therefore, concluded that the trap lavas in Kutch have mainly erupted from Hawaiian type shield volcanoes. The lavas erupted from such volcanic centres periodically and flowed to the south down the paleoslope towards the main volcanic field.
Positive gravity anomalies are noted around well known plugs of Saurashtra which have long been considered as the eruptive centres along tectonic lines. Similar anomalies which could also be interpreted as the subsurface volcanic plugs or cones, are seen within the major rift zones of Western India like Cambay and Narmada grabens and faulted west coast. Thus, the Deccan trap lavas of Peninsular India too might have erupted from Hawaiian type shield volcanoes situated along the major fracture zones.
- Volcanism in the Younger Dharwar Rocks Near Medur Dharwar District, Karnataka
Authors
1 Geological Survey of India, Jayanagar, Bangalore 560011, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 19, No 7 (1978), Pagination: 321-325Abstract
Andesite lavas are associated with pyroclastics and a few sheet-like porphyritic flows. The volcanism is considered to have been of mixed eruptions indicating sufficient fluidity and low gas content. The andesitic lavas are characterised by well developed pillow structure. They are interlayered with pyritiferous and carbonaceous argillites indicating volcanic eruption under submarine condition.
The lavas occupy the central part of a major refolded antiformal anticline plunging to the west. They have undergone metamorphism only up to the green-schist facies of regional metamorphism. Carbonatisation of lavas is a common feature, particularly in andesite.
- Metamorphic History of the Sandur Schist Belt, Karnataka
Authors
1 Jayanagar, Bangalore-560011, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 20, No 4 (1979), Pagination: 179-187Abstract
The Sandur schist belt is predominantly characterised by greenschist facies of regional metamorphism, which increases to amphibolite facies near the periphery of the schist belt. The higher facies rocks are marked by the appearance of metamorphic index minerals like garnet, andalusite, staurolite and cordierite. Study of the 'Si - Se' tectonites suggests that metamorphism is progressive, where chlorite and micas grow 'synkinematically' and garnet, andalusite, staurolite and cordierite grow post-kinematically with reference to first phase of folding (F1). Static growth of garnet, andalusite, staurolite etc., following the first phase of folding (F1), and their subsequent rotation with reference to second phase of folding (F2) clearly indicates a time gap between F1 and F2. Formation of assemblages of higher grade metamorphic minerals along the border region of the schist belt, is possibly due to influx of additional heat from some source (? intrusi ve granite) at a late tectonic stage.- A Note on the 'Volcanic Conglomerate'/Pyroclast Horizon near Palkanmaradi in the Hutti Schist Belt, Karnataka
Authors
1 Samchi, BT
2 Jayanagar, Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 23, No 10 (1982), Pagination: 506-510Abstract
Palkanmaradi 'Conglomerate' occurs as a conformable bed within the volcano-sedimentary sequence of the Hutti schist belt. Well-rounded pebbles of granodiorite/tonalite gneiss, microgranite/acid volcanic rock, angular to subangular fragments of amphibolite, are found embedded in a matrix having unusual chemistry representing probably an admixture of volcanic and sedimentary material. Along with the other rocks tbe conglomerate bed has suffered from three distinct phases of deformation and attained amphibolite facies of metamorphism.- Stratigraphy and Structure of the Sandur Schist Belt, Karnataka
Authors
1 12/ 1, Bireswar Dhole Lane, Calcutta-700 035, IN
2 377, 8th Block, 42nd Cross, Jayanagar, Bangalore-560 041, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 1 (1983), Pagination: 19-29Abstract
Sandur schist belt comprises predominantly of volcanic rocks with subordinate amount of metasediments. Mineralogy of the clastic sediments indicates a pre-existing sialic crust. The schist belt represents a fracture-controlled basin having an unstable tectonic set-up. Two distinct phases of folding deformation (SD1 and SD2), of which the earlier one (SD1) is quite pronounced producing the NW-SE trending regional structure of the schist belt, are noted. SD1 is associated with the development of macroscopic folds (F1), tight to isoclinal mesoscopic folds (f1 ), schistosity (S1 ), mineral lineation Im), fold mullion (In), and pebble lineation (Ip). SD2 is associated with the development of broad warps (F2) with axial traces along ENE-WSW direction, open to close mesoscopic folds (f2) and crenulation cleavage (S2).- Microfacies Analysis of Limestones
Authors
1 Oil and Gas Commission, Dehra Dun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 10 (1983), Pagination: 549-550Abstract
No Abstract.- Coated Grains
Authors
1 Malaviya Institute of Petroleum, Exploration, Dehra Dun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 12 (1985), Pagination: 896-898Abstract
No Abstract.- Review of Marine and Petroleum Geology Journal
Authors
1 Dehra Dun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 28, No 1 (1986), Pagination: 65-65Abstract
No Abstract.- Carbonate Petroleum Reservoirs
Authors
1 Oil and Natural Gas Commissioll Dehra Dun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 30, No 4 (1987), Pagination: 319-320Abstract
No Abstract.- The Indian Ocean: Exploitable Mineral and Petroleum Resources
Authors
1 Oil and Natural Gas Commission, Bombay 400022, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 32, No 5 (1988), Pagination: 437-438Abstract
No Abstract.- Gold Mineralisation in Uti Block of Hutti-Maski Supracrustal Belt, Karnataka
Authors
1 Geological Survey of India, 29, Jawaharlal Nehru Road, Calcutta 700 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 36, No 1 (1990), Pagination: 79-89Abstract
Gold mineralisation, hosted by varied lithounits, is broadly classified into two types. 1) Syngenetic stratabound type, 2) Epigenetic lode type
Syngenetic stratabound type mineralisation, confined to pyritiferous carbonaceous schist, has little economic significance, whereas economic deposits belong to epigenetic type. Epigenetic lode type mineralisation is hosted by both mafic and felsic rocks. Mineralised zones are confined to structural dilatant zones (shear zones) and are characterised by wall-rock alteration. Mineralogical and geochemical changes are most conspicuous.
Keywords
Economic Geology (Metals), Gold, Karnataka, Hutti-Maski Belt, Raichur Dist., Uti.- Estimates of Effective Elastic Thickness along the Southwest Continental Margin of India using Coherence Analysis of Gravity and Bathymetry Data - Geodynamic Imlication
Authors
1 201/C, ISM House, Thakur Village, Kandivali (East), Mumbai - 400 101, IN
2 Department of Earth Sciences, IIT Powai, Mumbai, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 4 (2008), Pagination: 593-595Abstract
No Abstract.- Geophysical Structure of Western Offshore Basins of India and its Implications to the Evolution of the Western Ghats
Authors
1 201/C, ISM House, Thakur Village, Kandivali (East), Mumbai-400 101, IN
2 Department of Earth Sciences, IIT Powai, Mumbai, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 4 (2008), Pagination: 595-596Abstract
No Abstract.- Petrography, Diagenesis, Provenance and Tectonic Setting of the Sandstones of Upper Katrol formation (kimmeridgian), Nakhtaran Area, Kachchh, Gujarat
Authors
1 201/C, ISM House, Thakur village, Kandivalli (E), Mumbai - 400 101, IN
2 P.G. Department of Jammu, University of Jammu, Jammu - 180 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 4 (2007), Pagination: 867-869Abstract
No Abstract.- Petrology and Geochemistry of Basanite Dykes and Gabbro from Northern Kutch, Western India: Implications on Source Rock Characteristics
Authors
1 Department of Geology, Presidency College, 86/1 ,College Street, Kolkata - 700 073, IN
2 Indian Institute of Technology, Roorkee - 247 667, IN
3 Indian Institute of Geomagnetism ,Magnetic Observatory, Alibag - 402 20 1, IN
4 Flat 201, C-Wing, ISM House, 818A Thakur Village, Kandivali(E), Mumbai- 400 101, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 5 (2007), Pagination: 771-779Abstract
Major and trace (including rare earth)element abundances, mineral compositions and Nd and Sr isotopic compositions have been determined for the mafic dykes (classified as basanite) and gabbro of the northern Island belt of Kutch rift basin. These are petrographically and geochemically distinct but have similar mantle normalized trace element patterns Measured87Sr/86Sr ratios in the mafic dykes vary from 0 70428 to 0 70593 &Nd(i) varies from 0 27 to - 6 5. The isotopic compositions are broadly similar to that of Mahabaleshwar flows of western Deccan volcanic province. The geochemical character suggests the influence of fractional crystallisation in the evolution of the basanite dykes. The parent magma was enriched in K, Ti, Na and P suggesting derivations from an enriched source during the early phase of lifting Palaeomagnetic data on the dykes show the presence of both normal polarity direction at Dm = 338°, Im=-47° and reverse polarity direction at Dm=14l° and Im=34° indicating multiple intrusion Virtual Geomagnetic Pole(VGP) for the basanite dykes differs from Deccan Super pole suggesting a magmatic event older than the main Deccan eruption.Keywords
Petrology, Geochemistry, Dykes, Gabbro, Kutch, Gujarat.- Structure and Tectonics of Kutch Basin, Western India, with Special Reference to Earthquakes
Authors
1 201/C, ISM House, Thakur Village, Kandivah (E), Mumbai- 400 101, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 5 (2003), Pagination: 626-629Abstract
No Abstract.- Proceedings of the International Seminar on Coal Bed Methane: Prospects and Potetialities
Authors
1 6, Siddarth Enclave, General Mahadev Singh Road, Ballupur, Dehra Dun-248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 1 (2002), Pagination: 91-91Abstract
No Abstract.- A Geological Study of Earthquakes in Kutch, Gujarat, India
Authors
1 201/C, ISM House, Thakur Village, Kandivali (E), Mumbai - 400 101, IN
2 100, Rajendra Nagar, Dehra Dun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 2 (2002), Pagination: 131-142Abstract
In this paper an attempt has been made to work out a geological model explaining the cause of earthquake rupture nucleation. Kutch rift is characterised by foothill uplifts and hanging wall half-grabens bound by quasi-vertical faults, which are resurgent primordial faults of Mid-Proterozoic Delhi fold belt. The structural style, tectonic cycles, fault kinematics and seismological data are reviewed to identify the causative fault and the critical zone for repeated earthquakes in Kutch. The Kutch Mainland fault (KMF) along the rift axis is the principal weak zone within the rift. Initiated as normal fault during Mesozoic rifting the near vertical KMF became a right lateral strike slip fault during post-Cretaceous inversion. The fault side steps to the left and continues to the east as the South Wagad Fault (SWF). This SWF is identified as the most active segment for repeated earthquake nucleation. The over step zone between them is a convergent transfer zone and is presently under compressive stress.Two first order basement ridges orthogonal to the rift axis are the unique features of this rift basin: the Median High occurs across the middle of the basin along its hinge zone and Radhanpur-Barmer arch occurs along the eastern rift margin separating it from the N-S Cambay rift. The Radhanpur-Barmer arch along the western rift shoulder of Cambay rift, acts as a ramp for the present northeast-directed compressive stress. Due to this the strain build up in the eastern part of Kutch rift is relatively more than in the western part, west of the Median High. The mounting stress in the eastern part is responsible for repeated thrusting along SWF. Presumably, the SWF would tend to flatten towards a detachment surface close to the base of the seismogenic layer where thrusting is expected. Thus, SWF becomes the active segment (eastern trace of KMF) of the principal fault causing repeated thrust at depth in mid-crustal region. The fading KMF is likely to converge with SWF at dcpth. Aftershock data corroborate this interpretation. The transfer zone where the epicenters of both 1956 Anjar and the recent 2001 Bhuj earthquakes are located close to each other is the critical area for the occurrence of earthquakes. The focal depths (15-20 km) seem to be occurring in the zone of flattening of SWF, which appears to be the critical site for rupture nucleation. Accordingly this segment is interpreted as the vulnerable sire for repeated ruptures causing earthquakes.
Keywords
Earthquakes, Geological Model, Kutch, Gujarat.- Sedimentology, Sequence Stratigraphy and Syn-Rift Model of Younger Part of Washtawa Formation and Early Part of Kanthkot Formation, Wagad, Kachchh Basin, Gujarat
Authors
1 Department of Geology, Banaras Hindu University, Varanasi - 221005, IN
2 201/C ISM House, Thakur Village, Kandivali (E), Mumbai - 400101, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 4 (2009), Pagination: 519-527Abstract
The 600 m thick prograding sedimentary succession of Wagad ranging in age from Callovian to Early Kimmeridgian has been divided into three formations namely, Washtawa, Kanthkot and Gamdau. Present study is confined to younger part of the Washtawa Formation and early part of the Kanthkot Formation exposed around Kanthkot, Washtawa, Chitrod and Rapar. The depositional architecture and sedimentation processes of these deposits have been studied applying sequence stratigraphic context.Facies studies have led to identification of five upward stacking facies associations (A, B, C, D, and E) which reflect that deposition was controlled by one single transgressive - regressive cycle. The transgressive deposit is characterized by fining and thinning upward succession of facies consisting of two facies associations: (1) Association A: medium - to coarse-grained calcareous sandstone - mudrocks alternations (2) Association B: fine-grained calcareous sandstone - mudrocks alternations. The top of this association marks maximum flooding surface as identified by bioturbational fabrics and abundance of deep marine fauna (ammonites). Association A is interpreted as high energy transgressive deposit deposited during relative sea level rise. Whereas, facies association B indicates its deposition in low energy marine environment deposited during stand-still period with low supply of sediments. Regressive sedimentary package has been divided into three facies associations consisting of: (1) Association C: gypsiferous mudstone-siltstone/fine sandstone (2) Association D: laminated, medium-grained sandstone - siltstone (3) Association E: well laminated (coarse and fine mode) sandstone interbedded with coarse grained sandstone with trough cross stratification. Regressive succession of facies association C, D and E is interpreted as wave dominated shoreface, foreshore to backshore and dune environment respectively.
Sequence stratigraphic concepts have been applied to subdivide these deposits into two genetic sequences: (i) the lower carbonate dominated (25 m) transgressive deposits (TST) include facies association A and B and the upper thick (75m) regressive deposits (HST) include facies association C, D and E. The two sequences are separated by maximum flooding surface (MFS) identified by sudden shift in facies association from B to C. The transgressive facies association A and B represent the sediments deposited during the syn-rift climax followed by regressive sediments comprising association C, D and E deposited during late syn-rift stage.
Keywords
Sedimentology, Sequence Stratigraphy, Synrift Model, Wagad, Kachchh Basin, Gujarat.References
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Authors
1 KDMIPE, ONGC, Dehradun, IN