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Mamtani, Manish A.
- Deformation of Earth Materials - An Introduction to the Rheology of Solid Earth
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1 Kharagpur-721302, IN
1 Kharagpur-721302, IN
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 4 (2008), Pagination: 571-571Abstract
No Abstract.- European Workshop on Fabric Quantification
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1 Geological-Palaontologisches Institut, INF-234, University, Heidelberg, 0-691 20, Heidelberg, DE
1 Geological-Palaontologisches Institut, INF-234, University, Heidelberg, 0-691 20, Heidelberg, DE
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 4 (2007), Pagination: 870-870Abstract
No Abstract.- 16th Deformation Mechanisms, Rheology and Tectonics(DRT) Coisfference 2007
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1 Department of Geology & Geophysics, IIT, Kharagpur 721302, IN
1 Department of Geology & Geophysics, IIT, Kharagpur 721302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 6 (2007), Pagination: 1093-1093Abstract
NO Abstract.- International Conference on Deformation Mechanisms, Rheology and Tectonics-(DRT)-2003
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1 Dept. of Geology & Geophysics, Indian Institute of Technology, Kharagpur -721 302, IN
1 Dept. of Geology & Geophysics, Indian Institute of Technology, Kharagpur -721 302, IN
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 62, No 2 (2003), Pagination: 247-248Abstract
No Abstract.- Microtectonics (CD-ROM)
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1 Dept. of Geology & Geophysics, lndian Institute of Technology, Kharagpur-721 302, West Bengal, IN
1 Dept. of Geology & Geophysics, lndian Institute of Technology, Kharagpur-721 302, West Bengal, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 5 (2001), Pagination: 469-470Abstract
No Abstract.- Glossary of Structural Geology and Tectonics
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1 IIT, Kharagpur-721302, IN
1 IIT, Kharagpur-721302, IN
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 3 (2008), Pagination: 433-433Abstract
No Abstract.- Analysis of Deformation Fabric in an Alkaline Complex (Koraput): Implications for Time Relationship between Emplacement, Fabric Development and Regional Tectonics
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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.References
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- Time Relationship Between Regional Deformation and Fabric Development in the Peralimala Pluton, South India - Inferences from Magnetic Fabric
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Authors
Affiliations
1 Department of Geology, University of Kerala, Kariavattom, Trivandrum - 695 581, IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721 302, IN
1 Department of Geology, University of Kerala, Kariavattom, Trivandrum - 695 581, IN
2 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 73, No 6 (2009), Pagination: 803-812Abstract
Anisotropy of magnetic susceptibility (AMS) is investigated in samples of Peralimala (PM) pluton (ca. 550 Ma) and adjacent gneiss, gabbro, mylonite and amphibolite from the Moyar Shear Zone (MSZ), Southern Granulite Terrane (SGT) with an aim to decipher the time-relationship between fabric development in the pluton and regional tectonics. Magnetic foliation recorded in the PM pluton is sub-parallel to the WNW-ESE striking MSZ. Magnetic foliation and lineation trajectories are sigmoidal and curve into the shear zone. A dextral sense of shear is deciphered from the trajectories, which is similar to that reported within the MSZ in some earlier studies. It is inferred that the PM pluton has developed post-emplacement deformation-fabric related to reactivation of the MSZ during Pan-African age. Based on the data and existing information about regional tectonics of the area, the possibility of the (a) PM pluton being a Deformed Alkali Rock and Carbonatite (DARC) and (b) MSZ marking an ancient suture zone, is discussed.Keywords
Southern Granulite Terrane, Moyar Shear Zone, Deformed Pluton, Anisotropy of Magnetic Susceptibility, DARC.References
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- Fractal Analysis of Quartz Grain Boundary Sutures in a Granite (Malanjkhand, Central India) - Implications to Infer Regional Tectonics
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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 73, No 3 (2009), Pagination: 309-319Abstract
In the present paper the intensity of serration of quartz grain boundary sutures in the Palaeoproterozoic age Malanjkhand granite (Central India) is quantified using the ruler method of fractal analyses. The northern margin of the granite has proximity to the Central Indian Suture (CIS) that forms the southernmost part of Central Indian Tectonic Zone (CITZ) along which amalgamation of the northern and southern Indian shields took place. The fractal dimension (D) of the quartz sutures is calculated in 13 samples collected at varying distance from the CIS. D values are noted to increase in samples towards the CIS. This demonstrates the influence of the tectonic events along the CIS on fabric development in the Malanjkhand granite. Magmatic fabric defined by preferentially oriented feldspar laths and high-T solid-state deformation fabrics are observed in areas distant from the CIS. In contrast, mylonites and low-T fabrics such as bulging quartz grain boundaries occur in proximity to the CIS. It is inferred that the emplacement and high-T fabric development in the Malanjkhand granite was synchronous with regional accretionary processes that occurred in the region during the Palaeoproterozoic. Two different possibilities, one involving a single tectonic event and the other involving multiple tectonic events are discussed to explain the superimposition of low-T over high-T fabric due to which intensity of quartz grain boundary serration increases towards the CIS.Keywords
Fractal Analysis, Quartz Sutures, Granite, Microstructure, Tectonics, Malanjkhand, Central India.References
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- "Deformation Style in Main Boundary Thrust and Ramgarh Thrust, Kumaun Lesser Himalaya"
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Authors
Affiliations
1 IIT, Kharagpur, IN
1 IIT, Kharagpur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 4 (2010), Pagination: 665-666Abstract
No Abstract.- The Making of India - Geodynamic Evolution
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Authors
Affiliations
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur-721302, IN
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur-721302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 2 (2010), Pagination: 188-189Abstract
No Abstract.- Rock Deformation and Structures (RDS-I) Conference-2010
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Authors
Affiliations
1 Department of Geology and Geophysics, IIT, Kharagpur - 721302, IN
1 Department of Geology and Geophysics, IIT, Kharagpur - 721302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 3 (2011), Pagination: 286-286Abstract
No Abstract.- Syntectonic Growth of Porphyroblasts over Crenulation Cleavages - An Example from the Precambrian Rocks of the Lunavada Group, Gujarat
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Authors
Affiliations
1 Department of Geology, M.S. University of Baroda, Vadodara - 390002, IN
1 Department of Geology, M.S. University of Baroda, Vadodara - 390002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 2 (1997), Pagination: 171-178Abstract
Porphyroblasts are known to overgrow crenulation cleavages syntectonicaIly in crenulated schists. However, the timing of growth of such porphyroblasts remains a problem. Whilst some researchers believe that porphyroblasts can syntectonically overgrow crenulation cleavages during the genesis of the crenulation cleavage, there are others who believe that porphyroblasts overgrow crenulation cleavages during an episode of deformation which post-dates the deformation which resulted in the formation of crenulation cleavage. In the present paper we present microstructural . evidence of syntectonic porphyroblasts overgrowing crenulation cleavages from the mica schists of the Lunavada Group of Precambrian rocks occurring in Gujarat. It is concluded that syntectonic porphyroblasts can grow over crenulation cleavages during the same episode of deformation which resulted in the genesis of the crenulation cleavage.Keywords
Structural Geology, Tectonics, Porphyroblast, Crenulation Cleavage, Gujarat.- Penrose Conference – 2011 on Deformation Localization in Rocks: New Advances
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Authors
Affiliations
1 Indian Institute of Technology, Kharagpur, IN
1 Indian Institute of Technology, Kharagpur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 6 (2011), Pagination: 599-599Abstract
No Abstract.- Structural Geology - From Classical to Modern Concepts
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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
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No Spl Iss 1 (2010), Pagination: 9-11Abstract
No Abstract.- Strain-Rate Estimation Using Fractal Analysis of Quartz Grains in Naturally Deformed Rocks
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Authors
Affiliations
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721302, West Bengal, IN
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721302, West Bengal, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No Spl Iss 1 (2010), Pagination: 202-209Abstract
The area-perimeter fractal dimension (D) of quartz grains has earlier been proposed as a strain-rate gauge based on experimental deformation of quartz aggregates. To test the application in naturally deformed rocks, D is calculated in (a) three quartzites belonging to the Lunavada Group of rocks (Aravalli Mountain Belt, NW India) that developed textures between 420-600°C and (b) one quartz reef sample from the Malanjkhand Granite (Central India), which underwent dynamic recrystallization between 250-400°C. Using the above T ranges and calculated D values, strain-rates are calculated for the two sets of samples. A 10-12.7 s-1 strain rate at 250°C is calculated for the quartz reef sample. However, at higher temperatures the calculated strain-rate is >10-10 s-1 for the quartz reef and the quartzite samples. The quartzites show evidence of dynamic recrystallization by grain boundary migration (GBM) and subgrain rotation (SGR), while the quartz reef is replete with evidence of bulging (BLG) recrystallization. T and calculated strainrates are plotted on available recrystallization map of quartz. It is demonstrated that whilst the T/strain-rate of the quartzites does not fall in the region of GBM and SGR, the T/strain-rate of the quartz reef falls in the BLG region. The problems with strain-rate calculations using area perimeter fractal dimension are discussed. It is concluded that the method of strain-rate calculation can be used only for lower T.Keywords
Strain-Rate, Fractals, Quartz, Deformation.References
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- Fractal Analysis of Magnetite Grains - Implications for Interpreting Deformation Mechanism
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1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur – 721302, IN
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur – 721302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 3 (2012), Pagination: 308-313Abstract
In the present study, the grain size (d) and shape of 225 magnetite grains, that crystallized at T>600°C in a syntectonic granite (Godhra Granite, India) are evaluated and implications of data to decipher deformation mechanism of magnetite are discussed. Fractal (ruler) dimension (D) analysis of magnetite grains is performed and it is demonstrated that they show fractal behaviour. Smaller magnetite grains tend to be more serrated than the larger ones, which is manifested in the higher fractal (ruler) dimension (D) of the former. Assuming a natural strain rate ranging between 10-10 s-1 and 10-14 s-1 , the grain size data fall dominantly in the dislocation creep field of the existing deformation mechanism map of magnetite for 630°C. However, SEM-EBSD studies reveal that subgrains are absent in the magnetite grains and they did not undergo dislocation creep. Thus it is inferred that the shape of magnetite grains was not controlled by dislocation creep. It is concluded that the higher serration and increased fractal dimension of finer magnetite grains implies the importance of diffusion creep as an important deformation mechanism at high-T for magnetite in polymineralic rocks.Keywords
Magnetite, Granite, Deformation Mechanism, Dislocation Creep, Diffusion Creep, Fractals.References
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- Quantification of Microcrack Anisotropy in Quartzite-A Comparison between Experimentally Undeformed and Deformed Samples
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1 Department of Geology & Geophysics, Indian Institute of Technology, Kharagpur-721302, West Bengal, IN
1 Department of Geology & Geophysics, Indian Institute of Technology, Kharagpur-721302, West Bengal, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 2 (2012), Pagination: 153-166Abstract
In this paper, microcrack patterns in a quartzite are quantified using fractal geometry based methods. Since the quartzite does not show a mesoscopic foliation, the fabric was recognized using anisotropy of magnetic susceptibility (AMS) analysis. Microcracks were investigated in thin sections prepared along the three principal planes of the AMS ellipsoid. Point load tests were performed on cores drilled parallel as well as perpendicular to the magnetic foliation. After experimental deformation, thin sections were prepared in two orientations - (a) parallel to the plane of failure (i.e., parallel to the direction of loading), (b) perpendicular to the plane of failure (i.e., perpendicular to the direction of loading), and microcrack patterns in these sections were investigated. The box-counting method of fractal analysis was first applied to microcracks traced from SEM images from each thin section of the experimentally undeformed as well as deformed samples to establish the fractal nature of the microcrack pattern. It was found that in thin sections perpendicular to the direction of loading, the box (fractal) dimension tends to marginally increase. This is inferred as a manifestation of the increase in complexity of the pattern. The software AMOCADO, which is based on the modified Cantor Dust method of fractal analysis, was applied to microcrack pattern from each thin section in order to quantify the pattern anisotropy. It is noted that the anisotropy significantly reduces in sections perpendicular to the loading direction. SEM data are presented to demonstrate that this reduction in anisotropy is on account of generation and/or growth of new cracks in random orientations. It is envisaged that the approach adopted in this investigation maybe useful in rock mechanics and mineral-resource applications in future.Keywords
Microcracks, SEM, Fractal, Anisotropy Quantification, Quartzite, Experimental Deformation, Anisotropy of Magnetic Susceptibility.References
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