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- D. N. Kanungo
- J. Mallikarjuna Rao
- D. Guptasarma
- D. S. N. Murthy
- A. V. Ramana Rao
- B. Venkatanarayana
- N. R. Baker
- R. Satyanarayana Rao
- Y. J. Bhaskar Rao
- M. Jayananda
- Suresh N. Karkhanis
- G. Parthasarathy
- A. S. Collins
- K. Guru Rajesh
- G. S. Vara Prasad
- T. Radhakrishna
- Alan S. Collins
- T. Yellappa
- N. V. Chalapathi Rao
- Kusumita Arora
- D. P. Mohanty
- P. Nagesh
- V. V. Sivappa
- M. Santosh
- T. Tsunogae
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
Chetty, T. R. K.
- Anorthosite Body in the Nellore Mica-Pegmatite Belt of Eastern India
Abstract Views :190 |
PDF Views:123
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad-7, IN
1 National Geophysical Research Institute, Hyderabad-7, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 19, No 2 (1978), Pagination: 87-90Abstract
Anorthosites from Nellore mica belt include pure anorthosites, gabbroic anorthosites and anorthositic gabbros. The anorthosite intrusives are deformed and metamorphosed along with the host rocks. The structural setting of the host rocks and similar association of anorthosites in other parts of Eastern Ghats, suggest that these rocks belonged to the Eastern Ghat Orogeny. On the basis of the field set-up and the chemical analyses, the anorthosites of Nellore mica belt show similarity to the anorthosites of Adirondack.Full Text
- Anorthosites and Associated Rocks of Nellore-Gudur, South India
Abstract Views :178 |
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Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad 500 007, IN
1 National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 5 (1986), Pagination: 428-439Abstract
Structural, petrographic and geochemical characters of several anorthosite bodies exposed over a length of eight km in the eastern margin of India are presented. From the asymmetry of parasitic folds and cleavage/bedding relationship in the host rocks, it is concluded that these were emplaced into anticlinal cores of isoclinally folded Precambrian schistose formations.
Textural variation from centre to border, mafic enrichment towards the margins. alignment of linear structures combined with steeply dipping foliation of arcuate nature parallelling the boundaries. suggest that anorthositic bodies are plug-shaped and viscous magmatic fluid moved vertically upwards. The progressive variation in mineralogy. grain-size and some of the major oxides is attributed to flow differentiation.
- Discovery of a New Kimberlite Pipe in Andhra Pradesh by Stream Sediment Sampling
Abstract Views :200 |
PDF Views:143
Authors
D. Guptasarma
1,
T. R. K. Chetty
1,
D. S. N. Murthy
1,
A. V. Ramana Rao
1,
B. Venkatanarayana
1,
N. R. Baker
1
Affiliations
1 National Geophysical Research Institute, Hyderabad 500 007, IN
1 National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 3 (1986), Pagination: 313-315Abstract
No Abstract.Full Text
- Proto-Penner River Course and its Role in the Distribution of Alluvial Diamonds: An Evidence from Landsat Data
Abstract Views :171 |
PDF Views:4
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad 500 037, IN
2 National Remote Sensing Agency, Hyderabad 500 037, IN
1 National Geophysical Research Institute, Hyderabad 500 037, IN
2 National Remote Sensing Agency, Hyderabad 500 037, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 28, No 6 (1986), Pagination: 480-488Abstract
A possible Proto-Penner river course, running in a NNE direction from the elbow of capture near Penna Ahobilarn and joining the river Tungabhadra near Kurnool, in Andhra Pradesh, has been inferred from a Satellite Remote Sensing based geomorphic study. Occurrence of lag-gravel and diamonds, remnant alluvial tracts, anomalous drainage pattern, etc. are cited as evidences. Some potential areas such as remnant alluvial patches along Proto-Penner river course and alluvial plains along adjacent streams and topographic depressions are indicated as possible areas for alluvial diamond exploration. Various geomorphic features occurring in Archaean denudational hill province and Cuddapah structural hill province are delineated.- LANDSAT Thematic Mapper Data Applied to Structural Studies of the Eastern Ghat Granulite Terrane in Part of Andhra Pradesh
Abstract Views :181 |
PDF Views:1
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad 500 007, IN
1 National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 42, No 4 (1993), Pagination: 373-391Abstract
LANDSAT TM data have been used as an aid to studying the regional geology of the granulite terrane in the southern part of Eastern Ghats. The technique in conjunction with regional traverses proved to be useful in identifying regional structural elements, such as shear zones, fold patterns of different scales and other lineament patterns, in poorly exposed and inaccessible areas. A major crustal scale ductile shear zone, designated as Sileru shear zone, with a dextral sense is highlighted and lies at the western margin of the high grade terrane. The other shear zones within the granulite terrane, characterised by migmatitic gneisses and typical L-S mylonitic fabrics, are associated with transpressional tectonics. Fold patterns varying from tight upright isoclinal folds to refolded large scale recumbent folds, along with complex fold interference structures on mesoscopic to regional scale are described. The interpretation of LANDSAT data, followed by limited ground based traverses from Sileru to Visakhapatnam in Visakhapatnam district and from Chinturu to Eleswaram in East Godavari district are the constraints in precisely defining the regional structures and understanding the tectonic processes that fashioned shear zones and fold patterns in granulite terranes. A fold thrust thin-skinned tectonic model involving two tectonothermal events for the study area is envisaged.Keywords
Granulite Terrane, Tectonics, Eastern Ghats, Andhra Pradesh.- Behaviour of Stretching Lineations in the Salem-Attur Shear Belt, Southern Granulite Terrane, South India
Abstract Views :171 |
PDF Views:2
Authors
Affiliations
1 National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007, IN
1 National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 52, No 4 (1998), Pagination: 443-448Abstract
A rare occurrence of both steep and shallow plunging stretching lineations within a single outcrop, has been described from the Salem-Attur shear belt, and the regional variations in the orientation of stretching lineations are discussed in terms of transpressional tectonics in the Cauvery shear system, southern granulite terrane, South India.Keywords
Structural Geology, Granulite Terrane, Stretching Lineation, Shear Zone, Transpression, Tamil Nadu.- Japan Holds 4th International Symposium on Gondwana to Asia and 2007 IAGR Annual Convention
Abstract Views :167 |
PDF Views:121
Authors
Affiliations
1 Bangalore, IN
2 NGRI, Hyderabad, IN
1 Bangalore, IN
2 NGRI, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 2 (2008), Pagination: 299-299Abstract
No Abstract.Full Text
- Natural Graphite from Neoproterozoic Psammitic Gneiss, Inanalo Mountain, Southern Madagascar
Abstract Views :179 |
PDF Views:150
Authors
Affiliations
1 Analytical Research Laboratory, Department of Polymer and Petroleum Engineering, MIT Engineering College, Kothrud, Pune - 4 11 038, IN
2 NGRI, Hyderabad - 500 007, IN
1 Analytical Research Laboratory, Department of Polymer and Petroleum Engineering, MIT Engineering College, Kothrud, Pune - 4 11 038, IN
2 NGRI, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 4 (2007), Pagination: 865-866Abstract
No Abstract.Full Text
- Structurally Controlled Drainage Pattern in Precambrian Mountainous Terrain: A Study from the Southern Sahyadri, India
Abstract Views :174 |
PDF Views:2
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad - 50 00 07, IN
1 National Geophysical Research Institute, Hyderabad - 50 00 07, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 3 (2007), Pagination: 499-519Abstract
In this paper, we present an analysis of relationship between the drainage pattetn and structure of the bedrock in the southern Sahyadri that represents a part of the Precambrian Southern Granulite Terrain India We have interpreted the lineaments from shaded relief maps prepared from the Shuttle Radar Topography Mission elevation data. The study area is divided into four blocks and the drainage pattern of each block is compared with the lineaments visually and statistically. Coincidence of the two datasets is quite strong implying a predominant control of structures on the drainage pattern. Drainage pattern is remarkably consistent with the Precambrian structural features like shear zones, metamorphic foliation, axial traces of folds and joints suggesting the dominant control exerted by the Precambrian structures on the present-Day drainage. The drainage divide of the region broadly follows the lithological boundaries. Thus, it can be considered that the large-scale parameters of drainage viz basin shape, size etc are controlled by lithology while the orientation, pattern and length of individual streams are controlled by structural features of the underlying rocks.Keywords
Structural Control, Drainage Pattern, Precambrian Mountainous Terrain, Sahyadri, Southern Granulite Terrain, India.- Symposium on "Supercontinents and Evolution of Earth" in the Context of Indian Shield
Abstract Views :194 |
PDF Views:104
Authors
Affiliations
1 Centre for Earth Science Studies, Trivandrum - 695 031, IN
2 National Geophysical Research Institute, Hyderabad - 500 007, IN
1 Centre for Earth Science Studies, Trivandrum - 695 031, IN
2 National Geophysical Research Institute, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 2 (2006), Pagination: 255-259Abstract
No Abstract.Full Text
- Natural Graphite from Neoproterozoic Psammitic Gneiss, Inanalo Mountain, Southern Madagascar
Abstract Views :221 |
PDF Views:126
Authors
Affiliations
1 National Geophysical Research lnstitute, Hyderabad -500 007, IN
2 Continental Evolution Research Group, Geology & Geophysics, School of Earth and Environmental Sciences, The Universlty of Adelaide, Adelade, SA 5005, AU
1 National Geophysical Research lnstitute, Hyderabad -500 007, IN
2 Continental Evolution Research Group, Geology & Geophysics, School of Earth and Environmental Sciences, The Universlty of Adelaide, Adelade, SA 5005, AU
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 2 (2006), Pagination: 176-180Abstract
We report here, for the first time, powder X-ray diffraction, and laser-Raman spectroscopic data on the graphite samples from Inanalo mountain (S24°24 3 1 2" E45°23'18 3 ), 20 km east of the Ampanihy shear zone of the southern Madagascar Our experimental results show that the graphite is highly crystalline, and syngenetic with the degree of graphitisation varying from 148 to 180, ylelding the peak metarnorphic temperatures of 750 to 850°C Laser Raman spectroscopic studies show only ordered peak at around 1580 cm-' In the frequency range from I000 to 2000 cm-' The commonly observed disordered peak In natural graphite is found to be absent in the studied sample, indicating high-temperature metamorphism There is no flurd deposited graphite (epigenetlc graphlte) in the sample The peak metamorphic temperature obtained In the present study is found to be in good agreement withinat obtained from the conventional geothermometry studies on the sample from the Beraketa shear zone or the Betroka tectonic belt.Keywords
Syngenetic graphite, Laser-Raman studies, XRD, Shear Zone, Inanalo Mountain, Southern Madagascar.Full Text
- Occurrence of Lamproitic Dykes at the Northern Margin of the Indravati Basin, Bastar Craton, Central India
Abstract Views :187 |
PDF Views:0
Authors
Affiliations
1 National Geophysical Research Institute, CSIR, Uppal Road, Hyderabad - 500 007, IN
2 Department of Geology, Banaras Hindu University, Varanasi - 221 005, IN
1 National Geophysical Research Institute, CSIR, Uppal Road, Hyderabad - 500 007, IN
2 Department of Geology, Banaras Hindu University, Varanasi - 221 005, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 4 (2010), Pagination: 632-643Abstract
Occurrence of two lamproitic dykes intruding the basement granite near Khadka village at the northern margin of the Indravati Basin, Bastar craton is reported. Combined field, microscopy, XRD, EPMA and whole-rock geochemical investigations reveal that these lamproites were subjected to high degree of hydrothermal alteration as well as possible metamorphism. However, relicts of their original textures are well-preserved thereby providing important clues as to the nature of the protolith. Quartz, carbonate, chlorite and phlogopite constitute the bulk mineralogy whereas spinel, apatite and iron oxides are the accessory phases. Chemical composition of the groundmass spinels are strikingly similar to those from the lamproites. The Khadka lamproite dykes display high abundances of compatible elements such as Ni (238-396 ppm), Cr (484-892 ppm), and V (160-200 ppm) as well as high-field strength elements such as Zr (719-2057 ppm) and Nb (92-126 ppm) that resemble those in lamproites. Khadka lamproites also have high whole-rock REE abundances (ΣREE up to 1260 ppm) and display fractionated chondrite-normalized REE patterns (La/Yb= 113-237) which together with their average compatible and incompatible trace elemental ratios (e.g. Nb/Zr, Nb/La, Ba/Rb) are strikingly similar to those of the Mesoproterozoic Krishna lamproites of the Eastern Dharwar craton. Available field evidences suggest the Khadka lamproites to be of at least Palaeoproterzoic age (1.88 Ga) which makes them some of the oldest such rocks as yet documented from the Indian shield.Keywords
Petrology, Geochemistry, Lamproite, Indravati Basin, Bastar Craton, Central India.- 7th International Symposium on 'Gondwana to Asia' and 2010 Iagr Annual Convention
Abstract Views :229 |
PDF Views:144
Authors
Affiliations
1 NGRI, Hyderabad, IN
1 NGRI, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 6 (2010), Pagination: 637-638Abstract
No Abstract.Full Text
- International Symposium on Precambrian Accretionary Orogens at University of Delhi and Field Workshop in the Dharwar Craton, Southern India
Abstract Views :144 |
PDF Views:139
Authors
Affiliations
1 NGRI, Hyderabad - 500 007, IN
1 NGRI, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 4 (2011), Pagination: 389-392Abstract
No Abstract.Full Text
- Inauguration of CSIR-NGRI Golden Jubilee Celebrations
Abstract Views :197 |
PDF Views:131
Authors
Affiliations
1 NGRI, Hyderabad - 500 007, IN
1 NGRI, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 4 (2011), Pagination: 393-394Abstract
No Abstract.Full Text
- Tectonics of Proterozoic Cuddapah Basin, Southern India: A Conceptual Model
Abstract Views :204 |
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Authors
Affiliations
1 National Geophysical Research Institute (Council of Scientific and Industrial Research), Hyderabad - 500 007, IN
1 National Geophysical Research Institute (Council of Scientific and Industrial Research), Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 5 (2011), Pagination: 446-456Abstract
A tectonic map of Cuddapah Basin (CB) and its adjacent regions has been compiled using LANDSAT TM data and the available literature on the prominent tectonic features which include Archaean greenstone belts, disposition of Proterozoic mobile belts along with the associated mid-crustal shear zones, and the mafic dyke swarms. The field characteristics of the two major fault zones: Gudur-Cuddapah and the Veldurti-Kalva-Gani fault system that cut across the CB have been re-examined and are re-interpreted as typical of transfer faults, which are generated exclusively by extensional tectonics. The earlier concept that these fault systems form a conjugate set of "Anderson type" causing the 'Cuddapah salient', needs to be reviewed.
The widespread extension in the upper crust is manifest in the form of normal faulting of 'listric' type in the Papaghni basin and a 'domino' type in the Nallamalai basin. While extensional tectonics have played a major role in shaping the geometry and kinematics of CB, the intermittent phases of compression seem to have been derived from major shearing events related to Proterozoic collisional processes in the region. A hypothetical crustal-cross section across the CB has been constructed considering the available geological and geophysical data and analogies were drawn from well-studied sedimentary basins of other continents. The presence of low- dipping detachment faults and shear zones in the lower crust, and their possible linkage with the extensional faults in the upper crust have been inferred to explain the evolution of the CB. The fault patterns and kinematic history in conjunction with the crustal architecture strongly suggest that the evolution of CB is genetically related to the Proterozoic collisional processes and associated crustal-scale transpressional tectonics in the basement at the eastern margin.
Keywords
Transfer Faults, Extension, Compression, Collision, Cuddapah Basin.References
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- Mapping of Shear Zones in the Western Ghats, Southwestern Part of Dharwar Craton
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Authors
Affiliations
1 National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road, Hyderabad - 500 007, IN
1 National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 2 (2012), Pagination: 151-154Abstract
A new map of structural architecture has been compiled involving modern mapping techniques at the craton-mobile belt interface in the Western Ghats around the Coorg granulite massif revealing the occurrence of important shear zones. The shear zones are linked to the Moyar-Bhavani Shear Zone in Southern India. The nature, geometry and kinematics of the shear zones in the granulitic crust and the cratonic part are distinctly different.Keywords
Dharwar Craton, Shear Zones, Coorg Massif, Western Ghats.References
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