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Singh, S. P.
- Pillow Lavas from Delhi Supergroup near Bambholai, Pali District, Rajasthan
Authors
1 Geological Survey of India, Road 5A, Rajinder Nagar, Patna 800 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 4 (1983), Pagination: 208-211Abstract
Three flows have been delineated on the basis of quartzite and phyllite interbeds. The lowermost flow shows few isolated pillows enclosed in subaqueous breccia while the upper flows are mostly pillow breccia showing isolated and close-packed pillows. Well developed pillows are elliptical to circular in shape and show radial joints and chilled glassy crust of variable thickness. Vesicles, amygdules and geodes of variable shapes and sizes are quite common. The hyaloclastite, filling the interspaces between pillows, is composed of light brown to dark glassy fragments and grades to breccia with increase in size of the fragments.Full Text
- Palaeocurrent and Clastic Dispersal Pattern of the Proterozoic Alwar Group around Jaipur, Northeastern Rajasthan
Authors
1 23, Professors' Colony, Chitragupta Nagar, Patna 800016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 9 (1984), Pagination: 585-597Abstract
The Proterozoic Alwar Group of tje Jaipur area, northeastern Rajasthan, includes two formations: the Rajgarh Formation, predominantly comprising conglomerate-feldspathic quartzite-arkosic grit association with subordinate phyllite and schist; and Kankwarhi Formation, representing an interbedded sequence of thinly bedded quartzite, phyllite and schist. These sediments were accumulated in tidal flat and fluvial environments in a fault-controlled basin.
Palaeocurrent study reveals that sediments were transported by external agency (river) from southeast, south, and southwest, and were dispersed within the depository by offshore and onshore currents and also by across-slope currents. The dispersal pattern so obtained is in close agreement with a coastal environment and hence it is suggested that cross-stratification can be utilized for palaeocurrent studies and palaeogeographie reconstruction even in a tectonically deformed terrain.
- Geochemistry of Jahaj-Govindpura Volcanics, Bayana Sub-Basin, Northeastern Rajasthan
Authors
1 23, Commerce College, Chitragupta Nagar, Patna 800016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 3 (1985), Pagination: 208-215Abstract
The Jahaj-Govindpura Volcanics - the youngest formation of the Rajalo Group in the Bayana sub-basin, comprises lava flows, agglomerates, volcanic breccias, tuffs, and quartzite interbeds. Volcanics have been fed by feeder dykes which clearly cut the underlying rocks. Plots of geochemical data from this volcanic suite reveal that compositionally they are transitional between aikali basalt and tholeiite. They resemble high-K2O continental tholeiites.- The Occurrence of Trace Fossils in the Delhi Supergroup of Northeastern Rajasthan
Authors
1 23, Commerce College, Professors' Colony, Chitragupta Nagar, Patna 800020, IN
2 B-16 (A), Chomu House, Jaipur 302001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 6 (1985), Pagination: 422-425Abstract
Trace fossils of trail markings and burrows are reported from the Alwar and Ajabgarh metasediments of the Proterozoic Delhi Supergroup from several localities of northeastern Rajasthan.Full Text
- Influence of Basement Tectonics on the Delhi Sedimentation in the Bayana Graben, Northeastern Rajasthan
Authors
1 23, Commerce College Professors' Colony, Chitragupta Nagar, Patna 800020, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 32, No 6 (1988), Pagination: 468-476Abstract
The Bayana graben contains over 3000m thick volcano-sedimentary sequence classified into the Raialo, the Alwar, and the Ajabgarh Groups of the Delhi Supergroup. The sedimentary pile consists of several sedimentary facies of fluvial to marginal marine environments. The volcanics show alkaline to high-K-tholeiitic affinity indicating continental magmatic environment.The basin is characterised by a set of synsedimentary dislocations which have controlled basin evolution, magmatism, and sedimentation. Based on the distribution patterns of various stratigraphic units and their sedimentological framework, a five-stage evolutionary sequence of the basin and associated sedimentation patterns have been discussed.
- Geochemistry of Acid Volcanics of the Dalma Group, Singhbhum, Eastern India
Authors
1 Petrology Division, Operations Bihar, Geological Survey of India, Lohia Nagar, Kankarbagh, Patna - 800 020, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 49, No 4 (1997), Pagination: 437-441Abstract
The earlier mapped chert to the north of the Dalma range is indeed a fine tuff characterised by the presence of spherulites, vesicles, amygdales, pele's tears. These rocks are silicified, peraluminous acid volcanic rocks.Full Text
- Post-Depositional Transformations during Burial and Exhumation in the Neoproterozoic Evaporite Sequences, NW Himalaya, India
Authors
1 Postgraduate Department of Geology, University of Jammu, Jammu - 180 006, IN
2 Wadia Institute of Himalayan Geology, 33, Gen Mahadeo Singh Road, Dehra Dun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 6 (2006), Pagination: 1058-1068Abstract
The Kashmir and Chamba sub-basins of the Proto-Tethys were the sites of wide spread evaporitic deposition along the northern most part of the Indian passive continental margin during the Neoproterozoic. The evaporite lithologies of the Kashmir sub-Basin in the form of layered gypsum and nodular gypsum show deformational features and largely, secondary textures. Evidence of anhydritization and compaction/deformation is present in the form of anhydrite porphyrotopes, alignment of the crystals in a plane (recrystallization) and flowage layers (the result of plastic deformation). The original sulphate precipitates have passed through stages of burial diagenesis, metamorphism and exhumation, with formation of alabastrine and porphyrotopic sulphate. The exhumation of the sulphate sequence resulted in the development of overgrowths, dissolution along the relict anhydrite crystal boundaries, and the formation of lenticular gypsum crystals.
The Chamba sub-Basin contains a more complete example of evaporite sedimentation including carbonates, sulphate and chloride sedimentation. The sulphate sequences here show alabastrine, porphyrotopic and ameboid textures suggesting dehydration and rehydration reactions simlar to Kashmir sub-Basin. The fibrous satin-Spar gypsum occurring in the fractures of the carbonates most likely formed by the gypsum-Saturated brine released from dissolution and reprecipitation of near surface sulphate evaporites.
The rock salt in the Chamba sub-Basin is comprised of banded halite together with variable amount of clay and other impurities. The halite consists of interlocking crystals with zoning and irregular internal outline due to burial and subsequent recrystallization. The ragged outer edges and coigns of the zoned crystals, and brecciated texture are suggestive of groundwater dissolution during exhumation.
The microthermometric experiments on single-Phase fluid inclusions occuring in the crystals demonstrate that fluid inclusions were formed around 45°C, the temperature at which anhydrite rehydrated to gypsum and halite reprecipitated during exhumation.
Keywords
Evaporites, Diagenesis, Neoproterozoic, NW Lesser Himalaya, India.- Platinum Group Minerals from the Madawara Ultramafic-Mafic Complex, Bundelkhand Massif, Central India: A Preliminary Note
Authors
1 Department of Geology, Bundelkhand University, Jhansi - 284001, Uttar Pradesh, IN
2 National Geophysical Research Institute (CSIR), Uppal Road, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 3 (2011), Pagination: 281-283Abstract
No Abstract.Full Text
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