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Gupta, Saibal
- Analysis of Deformation Fabric in an Alkaline Complex (Koraput): Implications for Time Relationship between Emplacement, Fabric Development and Regional Tectonics
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Authors
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1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721 302, IN
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721 302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 1 (2009), Pagination: 78-94Abstract
The Koraput Alkaline Complex (KAC) lies on the NE-SW trending Sileru Shear Zone (SSZ) separating the Proterozoic Eastern Ghats Province from the Archaean Indian craton. The core of the KAC is made of hornblende gabbro, which is rimmed by a band of nepheline syenite in the east and syenodiorite in the west. The timing of magmatism with respect to the SSZ is disputed. The KAC was deformed during emplacement, and a magmatic foliation related to the syn-emplacement deformation, D1, is present in the gabbroic core. The dominant D2-related field fabric strikes NE-SW and is penetrative in parts of the gabbro and marginal lithologies. E-W trending D3 shear zones cut across the complex. Distinct textural domains resulted from strain partitioning during deformation. Parts of the complex with magmatic textures constitute Domain-1, while D2 and D3 fabric zones comprise Domains-2 and 3 respectively. Temperatures in the KAC initially decreased following D1, but increased through D2 and D3. Anisotropy of magnetic susceptibility (AMS) studies show that the magnetic fabric generally follows S1 in Domain-1. While the magnetic fabric in Domain-2 is dominantly parallel to S2, some of it parallels S1. The latter is a relict D1 fabric that is recognized from AMS analysis but is obliterated in the field, which confirms that the KAC pre-dates the SSZ. The response of magnetic fabrics to temperature and implications of the study for Indo-Antarctica amalgamation are discussed.Keywords
Anisotropy of Magnetic Susceptibility, Alkaline Complex, Fabric, Eastern Ghats Belt, Indo-Antarctica Amalgamation.
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- Multi-Pronged Search for Palaeo-Channels near Konark Temple, Odisha - Implications for the Mythical River Chandrabhaga
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Authors
Subhamoy Jana
1,
William Kumar Mohanty
1,
Saibal Gupta
1,
Chirashree Srabani Rath
2,
Rashmi R. Behera
2,
Priyadarshi Patnaik
2
Affiliations
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, IN
2 Department of Humanities and Social Sciences, Indian Institute of Technology, Kharagpur 721 302, IN
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, IN
2 Department of Humanities and Social Sciences, Indian Institute of Technology, Kharagpur 721 302, IN
Source
Current Science, Vol 111, No 8 (2016), Pagination: 1387-1393Abstract
The 13th century CE Sun Temple at Konark in Odisha, India, is believed to have been built at the mouth of an ancient river named Chandrabhaga. This mythical river figures prominently in ancient literature, although at present no river exists in the proximity of the Konark Sun Temple. This study investigates the possibility of existence of a 'lost' river system near Konark through integrated geological and geophysical exploration in conjunction with historical evidence. Landsat, Aster Terra Look and Shuttle Radar Topographic Mission images have been used to identify and delineate the channel of an ancient river. A number of thematic maps have been generated and analysed in analytical hierarchy process and later integrated on a GIS platform to delineate the most probable trace of a palaeo-channel. The existence of a palaeo-channel at some locations is further corroborated through shallow surface geophysics using ground penetrating radar. The identified palaeochannel passes north of the Konark Sun Temple, extending approximately parallel to the coast.Keywords
Analytical Hierarchy Process, Mythical River, Palaeo-Channel, Shallow Surface Geophysics, World Heritage Sites.Full Text
References
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- Evidence for Structural Discordance in the Inverted Metamorphic Sequence of Sikkim Himalaya: Towards Resolving the Main Central Thrust Controversy
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Authors
Affiliations
1 Department of Geology and Geophysics, I.I.T., Kharagpur, Kharagpur - 721 302, IN
2 School of Environmental Sciences, University of East Anglia Norwich, NR4 7TJ, GB
1 Department of Geology and Geophysics, I.I.T., Kharagpur, Kharagpur - 721 302, IN
2 School of Environmental Sciences, University of East Anglia Norwich, NR4 7TJ, GB
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No Spl Iss 1 (2010), Pagination: 313-322Abstract
Inverted metamorphism in the Himalayas is closely associated with the Main Central Thrust (MCT). In the western Himalayas, the Main Central Thrust conventionally separates high grade metamorphic rocks of the Higher Himalayan Crystalline Sequence (HHCS) from unmetamorphosed rocks of the Inner sedimentary Belt. In the eastern Himalayas, the Inner sedimentary Belt is absent, and the HHCS and meta-sedimentary Lesser Himalayan Sequence (LHS) apparently form a continuous Barrovian metamorphic sequence, leading to confusion about the precise location of the MCT. In this study, it is demonstrated that migmatitic gneisses of the sillimanite zone in the higher structural levels of the HHCS are multiply deformed, with two phases of penetrative fabric formation (S1HHCS and S2HHCS) followed by third folding event associated with a spaced, NW-SE trending, north-east dipping foliation (S3HHCS). The underlying LHS schists (kyanite zone and lower) are also multiply deformed, with the bedding S0 being isoclinally folded (F1LHS), and subsequently refolded (F2LHS and F3LHS). The contact zone between the HHCS and LHS is characterized by ductile, top-to-the southwest shearing and stabilization of a pervasive foliation that is consistently oriented NW-SE and dips northeast. This foliation is parallel to the S3HHCS foliation in the HHCS, and the S2LHS in the LHS. Early lineations in the HHCS and LHS also show different dispersions across the contact shear zone, implying that pre-thrusting orientations of the two units were distinct. The contact shear zone is therefore interpreted to be a plane of structural discordance, shows a shear sense consistent with thrust movement and is associated with mineral growth during Barrovian metamorphism. It may well be considered to represent the MCT in this region.Keywords
Inverted Metamorphism, Main Central Thrust, Higher Himalayan Crystalline Sequence, North Sikkim.References
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- Balancing Teaching, Research and Institutional Rankings
Abstract Views :457 |
PDF Views:79
Authors
Affiliations
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, IN
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, IN
Source
Current Science, Vol 115, No 1 (2018), Pagination: 7-8Abstract
Ranking individuals and teams in sport is a fad that has caught on in a big way – the media, and indeed, the public, enjoy the idea of identifying a particular team or individual as the ‘best’ in a given field. In academia, similar ranking of universities and institutions has become a new measure of how centres of learning are perceived. While such rankings are useful in themselves, in that they do give an opportunity for institutions to introspect and identify areas where they excel or lag behind in comparison to their peer groups, they acquire more importance as these rankings are increasingly used as a benchmark for the amount of funding that an institution or university receives, particularly from the state. In addition, rankings may also play a crucial role in shaping the decisions of college aspirants while choosing particular institutions and fields of specialization.Full Text
- Palaeo-Channel Bisecting Puri Town, Odisha:Vestige of the Lost River ‘Saradha’?
Abstract Views :199 |
PDF Views:85
Authors
Subhamoy Jana
1,
William Kumar Mohanty
1,
Saibal Gupta
2,
Chirashree Srabani Rath
3,
Priyadarshi Patnaik
3
Affiliations
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721 302, IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721 302
3 Department of Humanities and Social Sciences, Indian Institute of Technology, Kharagpur 721 302, IN
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721 302, IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721 302
3 Department of Humanities and Social Sciences, Indian Institute of Technology, Kharagpur 721 302, IN
Source
Current Science, Vol 115, No 2 (2018), Pagination: 300-309Abstract
Puri, an ancient town located on the Odisha (Orissa) coast in eastern India, is associated with the 12th century CE Jagannath Temple. Many ancient and historical texts mention a mythical river named Saradha that flowed across the present Grand Road (Badadanda) between the Jagannath and Gundicha temples in Puri, dividing the town into two parts. This study traces the trail of a palaeo-channel beyond and within the heart of Puri town through an integrated study of geology, satellite imagery and ground-penetrating radar (GPR) survey. Various satellite imagery manipulation techniques – band combination, NDVI, MNDWI, linear spectral unmixing algorithm, density slice and spatial profiling – indicate the existence of water components along with vegetation bands, and the presence of a sinusoidal palaeo-channel trace with a V-shaped topographic outline. This is interpreted to represent the remnants of an extinct river valley. GPR survey also suggests that a subsurface river valley, about 128 m wide, existed across parts of the Grand Road. A large, sinusoidal water body near the sea beach at Puri, may represent the last remains of the dried-up channel. Integration of all these features suggests that a river once existed between Jagannath and Gundicha temples in Puri town. The constructed palaeo-channel trail may be that of the lost Saradha river described in ancient texts. The study develops a sequential methodology for identifying palaeo-channels even in urbanized localities like Puri.Keywords
Ancient Texts, Lost River, Puri, Satellite Imagery.Full Text
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