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Bhu, Harsh
- Dynamic Recrystallisation and Quartz Fabric in Palaeoproterozoic Conglomerate, East of Udaipur, Rajasthan
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Authors
Harsh Bhu
1,
B. L. Sharma
1
Affiliations
1 Department of Geology, Mohanlal Sukhadia University,Udaipur- 3 13 002, IN
1 Department of Geology, Mohanlal Sukhadia University,Udaipur- 3 13 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 5 (2006), Pagination: 819-830Abstract
The paper reports the study of strain analysis on pebbles of a horizon of polymictic conglomerate belonging to the Debarn Formation of the Aravalli Super group. The variable shape geometry of pebbles observed in different parts of the conglomerate outcrops, which cover a long linear distance east of Udaipur, is indicative of heterogeneous superimposed stream on somewhat Non-Spherical initial bodies.Micro textural studies indicated a variety of strain forms in constituent grains of both pebble and matrix along with attendant recovery through Sub-Gram formation and recrystallisation. Mica grams in the matrix have acted as a strainpartitioning mineral.
The lattice preferred orientation of c-axes in quartz is comparable to partially developed Type I pattern developed in regions of coaxial deformation. The pattern has been influenced by strain a d dynamic recrystallisation. The slip planes that operated in the deformation of quartz grains varied from basal slips to prism slips Basal slips were dominant at low temperature and low strain regions in quartz while prism slips at moderately higher temperature and moderate strain. The variation in slip planes can be accounted by in homogeneous nature of deformation possibly due to difference in critically resolved shear stresses in the conglomerate.
Keywords
Paleoproterozoic, Deformed Conglomerate, Strain Analysis, Quartz, Dynamic Recrystallisatlion, Deban Formation, Aravalli Supergroup, Rajasthan
- Deserted Nineteenth Century Paliwal Villages around Jaisalmer, Western Rajasthan, India:Historical Evidence of Palaeoseismicity
Abstract Views :219 |
PDF Views:108
Authors
Affiliations
1 Niloy Apartment, Flat 3/2G, 46A, R.N. Das Road, Kolkata 700 031, IN
2 Department of Geology, Mohanlal Sukhadia University, Udaipur 313 001, IN
1 Niloy Apartment, Flat 3/2G, 46A, R.N. Das Road, Kolkata 700 031, IN
2 Department of Geology, Mohanlal Sukhadia University, Udaipur 313 001, IN
Source
Current Science, Vol 112, No 02 (2017), Pagination: 402-405Abstract
Seismicity or seismic susceptibility implies proneness to earthquake incidence in a region. For this we cannot depend entirely on instrumental records, because this facility was almost unknown about 70-odd years ago, whereas the 'period of quiescence' between two successive major earthquakes in a region may be hundreds of years and sometimes more. This places a severe constraint on the understanding of the regional variability of seismic susceptibility or the proneness of any particular region to the occurrence of an earthquake. In such cases, the necessity is to look for evidence of palaeoseismicity in historic/pre-historic and archaeological records, and for much older events the different fault features preserved in geomorphic features. Here we cite an incidence of seismic event based on the examination of a large number of deserted early nineteenth century houses scattered around Jaisalmer region in western Rajasthan, India. Lying unoccupied for about 190 years or more, evidence of destruction is observed in each and every house, which is not generally witnessed in disused old houses standing for hundred years or more. Looking into the nature of collapse-related flattening features such as collapsed roofs, fallen joists, lintels and pillars in all these houses, we suggest that these are manifestations of earthquake-related destruction. Such an assumption finds strong support from the observed evidence of recent tectonic activities and from the observed ground movements along several major faults in the region covering Jaisalmer and the adjoining areas.Keywords
Deserted Paliwal Villages, Evidence of Recent Tectonics, Earthquake Related Destruction, Historical Evidence of Earthquake, Palaeoseismicity.Full Text
- Response
Abstract Views :997 |
PDF Views:79
Authors
Affiliations
1 Niloy Apartment, Flat 3/2G, 46A, R.N. Das Road, Kolkata 700 031, IN
1 Niloy Apartment, Flat 3/2G, 46A, R.N. Das Road, Kolkata 700 031, IN
Source
Current Science, Vol 114, No 05 (2018), Pagination: 946-946Abstract
We must thank Bahadur et al. for mentioning the date of what they consider as the ‘Great migration’. Our suggestion about earthquake-related devastation was based on the field examination of different villages where the Paliwal Brahmins lived. We presented some telltale evidence of destruction of houses made of blocks of rocks without using any cementing materials. The earthquake-related destruction features in the poorly constructed stone-block houses of Kuldhar and other Paliwal villages were similar to those destroyed during the Latur earthquake in the recent past, and at about 4000 years ago site at the historical Mohenjodaro.Full Text
- Tectonostratigraphic Status of the Proterozoic Babarmal Pink Marble from the Aravalli Supergroup
Abstract Views :196 |
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Authors
Affiliations
1 Department of Geology, Government College, Sirohi - 307 001, IN
2 Department of Geology, M.L. Sukhadia, University, Udaipur - 313 00, IN
1 Department of Geology, Government College, Sirohi - 307 001, IN
2 Department of Geology, M.L. Sukhadia, University, Udaipur - 313 00, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 2 (2012), Pagination: 135-150Abstract
Present study reviews the tectono-stratigraphic status of Babarmal pink marble from the Aravalli Supergroup through mapping and petrographic study of marble as well as associated lithologies. The pink marble is predominantly calcitic and characteristically different from dolomitic carbonate rocks of the Jhamarkotra Formation, the Lower Aravalli Group. The marble is devoid of organic matter and phosphate content unlike the Jhamarkotra dolomite. The pink marble is underlain by quartz-pebble rich conglomerate. This assemblage represents a rare lithological association which has not been reported so far from the Aravalli Supergroup.Besides the above differences between the Babarmal pink marble and the Jhamarkotra dolomite we also noted significant similarities between the two with respect to greenschist facies metamorphism and three phases of deformational history. Similarities in both these aspects imply that the pink marble like the Jhamarkotra dolomite can be corroborated with the Aravalli orogenic cycle. While on the basis of distinguishing lithological and petrographic features the pink marble-pebbly conglomerate, the lithoassemblage is suggested to be designated as "Babarmal Formation" as a modification to the Babarmal Formation of Gupta et al. (1997) which constituted of pink marble.
The outcrop patterns on the high resolution map shows that the Babarmal litho-assemblages are sandwiched between the Barytes bearing meta-volcanics (that represent the underlying Delwara Formation) and the dolomite-quartzite-phyllite (that represent the overlying Jhamarkotra Formation) of the Lower Aravalli Group (Roy and Jakhar, 2002). Hence we suggest to place the Babarmal Formation as the middle stratigraphic unit of the Lower Aravalli Group of the Aravalli Supergroup.
Keywords
Tectonics, Stratigraphy, Proterozoic, Pink Marble, Pebbly Conglomerate, Babarmal, Aravalli Supergroup.References
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- ROY, A.B. and JAKHAR, S.R. (2002) Geology of Rajasthan (Northwest India) Precambrian to Recent. Scientific Publishers (India), Jodhpur, pp.25.
- ROY, A.B. and KRONER, A. (1996) Single zircon evaporation ages constraining the growth of the Archaean Aravalli craton, northwestern Indian Shield. Geol. Magz., v.133(3), pp.333-342.
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- ROY, A. B. PALIWAL, B.S., SHEKHAWAT, S.S., NAGORI, D.K., GOLANI, P.R. and BEJARNIYA, B.R. (1988) Stratigraphic and tectonic framework of the Aravalli Mountain Range. In: A.B. Roy (Ed.), Precambrian of the Aravalli Mountain, Rajasthan, India. Mem. Geol. Soc. India, v.7, pp.3-31.
- ROY, A.B. (2000) Geology of the Palaeoproterozoic Aravalli Supergroup of Rajasthan and northern Gujarat. In: M. Deb (Ed.), Crustal evolution and metallogeny in the northwestern Indian shield, (A festschrift for A. Mookherjee). Narosa Publishing House, New Delhi, pp. 87-114.
- ROY, A.B., SHARMA, B.L., PALIWAL, B.S., CHAUHAN, N.K., NAGORI, D.K., GOLANI, P.R., BEJARNIYA, B.R., BHU, H. and SABAH, M. ALI (1993) Lithostratigraphy and tectonic evolution of the Aravalli Supergroup - A protogeosynclinal sequence. In: S.M. Kassyap (Ed.), Rift basins and aulacogens, Gyanodaya Prakashan, Nainital. pp.73-90.
- SARANGI, S., GOPALAN, K., ROY, A. B., SREENIVAS, B. and DAS SHARMA, S. (2006) Pb-Pb age of carbonates of Jhamarkotra Formation: constraints on the age of Aravalli Supergroup, Rajasthan. Jour. Geol. Soc. India, v.67, pp.442-446.
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- Application of Thermal Remote Sensing Technique for Mapping ofUltramafic, Carbonate and Siliceous Rocks using ASTER Data in Southern Rajasthan, India
Abstract Views :212 |
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Authors
Affiliations
1 Department of Geology, Faculty of Earth Sciences, Mohanlal Sukhadia University, Udaipur 313 001, IN
1 Department of Geology, Faculty of Earth Sciences, Mohanlal Sukhadia University, Udaipur 313 001, IN
Source
Current Science, Vol 119, No 6 (2020), Pagination: 954-961Abstract
In the present study, thermal remote sensing technique and ASTER data have been used to delineate ultramafic, carbonate and siliceous rocks. The study gains importance as mineralized carbonate and ultramafic rocks are present in the southern region of Rajasthan, India between Udaipur and Dungarpur districts. The rocks in the study area include phyllites, mica schist, chlorite schist, quartzite, dolomite, granite, granitoids, gneiss and intrusive serpentinite. ASTER thermal bands were used to map ultramafics, siliceous and carbonate rocks on a scale of 1 : 380,000. Delineation of ultramafics was done using MRI-AV and MI-N indices, however the former provided a more informative map compared to the latter. QRIAV, QI-N and QI-RH indices were used for mapping siliceous rock. QI-RH provided a more informative map compared to QRI-AV and QI-N. The index used for carbonate rocks was CI-N, but this did not provide a satisfactory map.Keywords
ASTER TIR, Carbonate and Siliceous Rocks, Thermal Indices, Thermal Remote Sensing, Ultramafics.Full Text
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