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
Tandon, S. K.
- Mechanical Analyses of Middle Siwalik Sandstones from Ramnagar, Nainital District, Kumaon Himalaya
Authors
1 Department of Geology, Delhi University, Delhi, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 13, No 1 (1972), Pagination: 51-58Abstract
Studies have been carried out on the size characteristics of Middle-Siwalik sandstones collected from the tract lying between Ramnagar and Kalagarh with a view to interpret the environment of deposition. Statistical parameters have been obtained from the weight frequencies recorded from the mechanical analyses of these sediments. Analysis on the Wentworth's size classification reveals that the sediments are composed essentially of fine and very fine sands, the former being predominant. It is seen that the coarser fraction behaves differently from the rest of the sediments and has been incorporated in response to fluctuations within the tectonic framework. Overall conditions of sedimentation remained more or less similar.
- Comparative Petrology of Pedogenic Carbonates from Quaternary Deposits of Kashmir and Rajasthan
Authors
1 Department of Geology, University of Delhi, Delhi 110007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 8 (1983), Pagination: 399-403Abstract
The purpose of this study is to compare pedogenic carbonates which have accumulated in varying climatic conditions in Quaternary deposits of North India. The pedogenic horizons sampled for the purpose are from the dunal/interdunal tract of parts of Rajasthan and from the Upper Karewa sub-Group of Kashmir valley. These pedogenic carbonates reveal an overall preponderance of micrite in both the situations. Similarity in the form of presence of voids and floating textures is also observed. The pedogenic carbonates of the Upper Karewa SUb-Group show a greater degree of corrosion and replacement indicating a more reactive microchemical environment. The presence of ferroan calcite in the pedogenic carbonates of Kashmir and its absence in those of Rajasthan further bears out the reducing character of the palaeoenvironment of the carbonate layer underlying the loess in the Kashmir valley.- 'Cyclic and Event Stratification'
Authors
1 Department of Geology, University of Delhi, Delhi 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 11 (1983), Pagination: 604-604Abstract
No Abstract.Full Text
- Environmental Regeneration in the Himalaya
Authors
1 Department of Geology, University of Delhi, Delhi 110007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 2 (1984), Pagination: 123-124Abstract
No Abstract.Full Text
- Erosion Intensity in a Mountain Watershed in the Himalayan Region
Authors
1 Department of Geology, University of Delhi, Delhi 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 10 (1983), Pagination: 533-539Abstract
A simple method for mapping of erosion intensity in a mountain watershed based on assignment of qualitative indices to various categories of geomorphic features, mean ground slopes and lithological cum structural state of the bedrock is proposed.
A preliminary case study has been conducted in a part of the Ravi drainage basin in the Himalayan region. The major geomorphic features observed are fill-cut and strath terraces, alluvial fans, landslides, small talus cones and debris-flow deposits. The slopes range from 4° to 41° and have been divided into seven classes consisting of 6° intervals each. Lithologically, the area consists of phyllite, quartzite, slate, limestone, conglomerate and granite. An erosion intensity map of this region indicates that most of the high erosion areas lie close to the main river and their distribution is controlled mainly by the recent drift material and the valleyside slopes.
Although this method is qualitative, it can be useful for a preliminary evaluation of erosion intensity. and for delimiting high erosion areas for environmental planning.
- Geomorphologic Development Across the Active Main Boundary Thrust, An Example from the Nainital Hills in Kumaun Himalaya
Authors
1 Kumaun University, Nainital 263001, IN
2 University of Delhi, Delhi 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 12 (1984), Pagination: 761-774Abstract
The Main Boundary Thrust marking the tectonic junction between the Lesser Himalaya and Siwalik molasse represents a zone along which underthrusting still occurs. Depositional terraces formed as a consequence of subrecent and historical landslides have been faulted and displaced vertically as well as horizontally in the Balia Valley, which follows the zone of the Main Boundary Thrust. Vertical scarps and triangular facets on the hillsides, uplift and dissection by faults of terraces and landslide fans, and presence of abandoned valleys across the Main Boundary Thrust, further bear testimony to recent movements. The burden of evidence points to uplift of the Siwalik domain by 30 to 80m relative to the Lesser Himalayan belt.- Palaeozoic Salt-Bearing Formations of the World
Authors
1 Department of Geology, University of Delhi, Delhi 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 10 (1985), Pagination: 763-763Abstract
No Abstract.Full Text
- Principles of Sedimentary Basin Analysis
Authors
1 Department of Geology, University of Delhi, Delhi 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 11 (1985), Pagination: 843-844Abstract
No Abstract.Full Text
- Geomorphology of the Ravi River
Authors
1 Department of Geology, University of Delhi, Delhi 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 28, No 4 (1986), Pagination: 338-338Abstract
No Abstract.Full Text
- Sedimentary and Evolutionary Cycles
Authors
1 Department of Geology, University of Delhi, Delhi-110007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 28, No 1 (1986), Pagination: 64-65Abstract
No Abstract.Full Text
- 'Correlation of Quaternary Chronologies'
Authors
1 Department of Geology, University of Delhi. Delhi-110007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 28, No 1 (1986), Pagination: 67-68Abstract
No Abstract.Full Text
- Orogenic Evolution of Southern Asia (From Turkey to Indonesia)
Authors
1 Department of Geology University of Delhi, Delhi 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 30, No 2 (1987), Pagination: 162-162Abstract
No Abstract.Full Text
- Quaternary Valley-Fill Deposits of the Ravi Drainage Basin in Chamba, Western Himalaya: Definition, Lithostratigraphy and Depositional Framework
Authors
1 Department of Geology, University of Delhi, Delhi 110007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 29, No 6 (1987), Pagination: 540-553Abstract
Quaternary deposits in the Himalaya fall into two major categories: Group 1-lntra-montane basinal fills occurring in various tectonic zones, and valley-fill sequences of limited width along the linear extent of major Himalayan drainages and Group 2-Sub-montane basinal fills in the foot-hills zone. The Mangla Formation (250m thick) is being defined from one of the major Himalayan drainages-the Ravi river. It is divided into six members representing paraglacial fan and braided stream deposits. The 'glacial' history of the sequence has been inferred from the physical environment of the terrain. and by relating the deposits to the gross geomorphological features.
Attempts to correlate the Mangla Formation with the glacial deposits in the Himalayan region, particularly Swat Kohistan and the southern slopes of the Dhauladhar range, are beset with difficulties in the absence of a proper chronology of Quaternary glacial events in the Himalaya. Two major ice advances have been interpreted in the Dhauladhar Range. In the absence of datable materials, no meaningful temporal relationships can be established for the ice advances.
- Memoirs of an Unrepentant Field Geologist
Authors
1 Department of Geology, University of Delhi, Delhi 110001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 32, No 5 (1988), Pagination: 435-436Abstract
No Abstract.Full Text
- Geology is a Field Science - But Who Cares?
Authors
1 Department of Geology, Delhi University, Delhi, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 33, No 5 (1989), Pagination: 383-386Abstract
No Abstract.- Lithofacies Analysis, Benthic Foraminifera and Depositional Environments of the Chhasra Member: A Transgressive Tide and Storm Affected Early Miocene Sequence in Kachchh, India
Authors
1 Department of Geology, University of Delhi, Delhi 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 38, No 2 (1991), Pagination: 119-149Abstract
A 40m thick Early Miocene sequence occurring near Naliya has been investigated for its sedimentary facies and benthic foraminiferal biofacies. The changing depositional environments of the sequence have been interpreted to represent (a) supratidal to (b) supratidal-intertidal and (c) subtidal (limited clastic influx) to ultimately subtidal (increased clastic influx) palaeoenvironments. The lowest part of the section shows evidence of emergence which together with benthic foraminiferal population dominated by Pararotalia nipponica - Loxostomwn lobatwn (water depths of 05-10m) suggests a supratidal environment.
The middle part of the stratigraphic interval has been subdivided into a lower and upper part on the basis of an intervening calcrete (calcretised shell limestone) horizon. The lower part of this interval represents lagoonal and high intertidal environments.
The upper part of this interval shows development of cross bedded and wave-rippled sandstones representing beach ridge-tidal inlet sequence. Other lithofacies include shell layers having predominance of one kind of organism. Some of these shell banks are wave sorted. Biofacies II -Hanzawaia nipponica - Cibicides lobatulus characterises this part of the section and indicates water depths of - 5Om.
The upper part of the sequence is composed of silt which contains Ammonia beccarii -Pseudorotalia gaimardi in abundance. This interval is frequently interspersed by oyster-Pecten beds and indicates subtidal environment with increased influx of siliciclastics.
The changing depositional environments show that these Early Miocene rocks represent a transgressive, tide-dominated, storm affected sequence.
Keywords
Lithofacies Analysis, Foraminifera, Chhasra Member, Kachchh, Gujarat, Early Miocene Sequence.- Neogene Quaternary Stratigraphy Including the Study of Fluvial and Glacial Systems
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 38, No 5 (1991), Pagination: 550-551Abstract
No Abstract.Full Text
- X-ray Diffraction Study on the Clay Mineralogy of Infra(Lametas)-/Inter-trappean Sediments and Weathered Deccan Basalt from Jabalpur, M.P: Implication for the Age of Deccan Volcanismcan Volcanism
Authors
1 Department of Geology, University of Delhi Delhi-110007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 44, No 3 (1994), Pagination: 335-337Abstract
X-ray diffraction study on the infra-/inter Hrappean sediments (Maastrichtian) and their associated degraded Deccan basalts from around Jabalpur, M.P, shows same clay mineral assemblages indicating the Deccan basalt as a major provenance of and hence pre-dating these sediments.Keywords
Lametas, Deccan Basalts, Clay Mineralogy.Full Text
- The Evolution of Clastic Sedimentology
Authors
1 University of Delhi, Delhi-110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 3 (2006), Pagination: 411-412Abstract
No Abstract.Full Text
- Quaternary Stratigraphy and Sedimentology of the Kotra Section on the Betwa River, Southern Gangetic Plains, Uttar Pradesh
Authors
1 Engineering Geosciences Group, IIT Kanpur - 208 016, IN
2 Departrnent of Earth Sciences, Dalhousie University, Halifax, Nova Scotia, B3H 355, CA
3 Departmen of Geology, University of Delhi, Delhi - 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 4 (2005), Pagination: 441-450Abstract
Floodplain deposits are exposed in an about 29 rn high cliff section at Kotra along the Betwa river, a tributary of the Yamuna river at the southern margin of the Gangetic Plains. The Betwa is a peninsular river originating in the Bundelkhand Craton parts of which are exposed as bedrock close to the sectipn. The Betwa river is incised and bordered by an extensive zone of badland (dissected into gullies). The.stratigraphic units comprise pedogenized floodplain muds and reworked carbonate grayels that fill small plains-fed channels. Gully, fills of mud and gravel mark extensive degradational surfaces that divide the section into discontinuity-bounded units, currently of unknown'duration and age. Closely spaced discontiquities low in the section may mark a former interfluve level, after which a thick floodplain succession accumulated up to the level of the modem clifftop. Presence of prominent discontinuities and thick floodplain deposits in the cliff sections suggest that the late Quaternary history of the southern plains is marked by cycles of channel incision and floodplain degradation and alluviation.Keywords
Quaternary, Allostratigraphy, craton-Sourced river sedimentation, Betwa river, Gangetic plain, Uttar Pradesh.- Fades Associations and Sedimentary Petrological Characteristics of Lameta Sequences of the Dongargaon Area, Central India
Authors
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 63, No 1 (2004), Pagination: 39-50Abstract
The Lameta Formation of the Dongargaon area is associated with the locally occurring basal Deccan lava flows. These sequences have been studied for their facies associations, petrographic, and diagenetic attributes in four localities: (1) Dongargaon hill, (2) Dongargaon nala, (3) Dhamni/Pavna and (4) Bijoli/Sagra. Four facies associations -(a) lacustrine- A, (b) lacustrine-B, (c) overbank with minor sheetwash deposits and (d) minor channels have been recognized by previous workers as well as in this study. An upsection shallowing trend is inferred.Petrographic studies resulted in the identification of two types of sandstones in the minor channel facies - one composed largely of calcrete grains and the other composed of quartzose grains. Diagenetic structures and fabrics of significance include septarian concretions and radiaxial fibrous calcite; and pedodiagenetic structures include mainly calcrete nodules and rhizocretions. The septarian concretions show a bimineralic character with a dolomicrite groundmass and a coarse crystalline spar filling up the cracks. Stable isotope composition of the calcrete nodules suggests a possibledual origin i.e., phreatic-pedogenic. Marl, calcareous siltstone and ostracods of the lacustrine facies range in values from -2.9%o to ~6.4%o for 8I3C and -2.7%o to -5.9%o for 5!80, and suggest marked fluctuations in the lake's hydrological regime.
Facies analysis, petrographic studies and stable isotope compositional data of selected carbonate facies and fabrics suggests that the Lameta Formation of the Dongargaon area is dominated by overbank and shallow lake environments. This contrasts with the dominance of palustrine and pond facies described previously from the Lameta Formation of the type locality of Jabalpur in Central India.
Keywords
Facies Associations, Sedimentary Petrology, Maastrichtian, Lameta Formation, Central India.- Facies Association and Sedimentary Petrological Characteristics of Lameta Sequences of the Dongargaon Area, Central India
Authors
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 University of Delhi, Delhi, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No 5 (2004), Pagination: 693-695Abstract
No Abstract.Full Text
- Age, Genesis and Significance of South African Coastal Belt Silcretes
Authors
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No Spl Iss 4 (2004), Pagination: 586-586Abstract
No Abstract.Full Text
- Report on the Second Meeting of IGCP 449: Global Correlation of Late Cenozoic Fluvial Sequences
Authors
1 Department of Civil Engineering, IIT, Kanpur - 208 016, IN
2 Department of Geology, Delhi University, Delhi - 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 4 (2002), Pagination: 386-386Abstract
No Abstract.Full Text
- Magnetic Polarity Stratigraphy of the Upper Siwalik Subgroup, East of Chandigarh, Punjab Sub-Himalaya, India
Authors
1 Department of Geology, University of Delhi, Delhi 110 007, IN
2 Institute of Geosciences, Shizuoka University, Shizuoka 422, JP
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 1 (1984), Pagination: 45-55Abstract
An approximately 900m thick succession of pre-Pinjor (Tatrot) and Pinjor beds of the Upper Siwalik Subgroup is exposed in the Khetpurali section which lies to the east of Chandigarh. Samples collected from the mudstone interval from forty-nine fluvial cyclic units exhibit a stable detrital remanent magnetisation. The study of magnetic polarity of these samples reveals the presence of six normal and six reverse magnetozones. The Tatrot-Pinjor faunal boundary has been interpreted to approximately lie at the Gauss-Matuyama boundary. Based on this interpretation, the Olduvai Event in Matuyama reversed polarity epoch spans 160m of the middle part of the Pinjor Formation. The local Pliocene/Pleistocene boundary in this section is interpreted to lie 170m higher in the sequence with reference to the Tatrot-Pinjor faunal boundary.Changes in the fluvial domain in the post-Gauss Epoch are interpreted to reflect changes from 'meander belt' deposits to 'braided stream' deposits. The first appearance of conglomerates in the section has been interpreted to occur in the post-Olduvai time.
- K. R. Gupta (1944-2011)
Authors
1 University of Delhi, Delhi - 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 4 (2011), Pagination: 291-294Abstract
No Abstract.- Calcretes and Related Palaeosols in Phanerozoic Stratigraphic Records of India: a Review
Authors
1 Department of Geology, University of Jammu, Jammu - 180 006, IN
2 Department of Geology, University of Delhi, Delhi - 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 1 (2002), Pagination: 75-89Abstract
Calcretes occur commonly in both Quaternary and pre-Quaternary continental and marginal marine sequences, and are generally considered as indicators of seasonal, aridlsemi-arid climatic conditions. The marginal marine and continental sedimentary basins of the Himalaya and the Phanerozoic Gondwana basins are analysed here to evaluate the possibilities of calcrete and palaeosol occurrences in them. A compilation of the known occurrences of calcretes and related palaeosols in pre-Quaternary and Quaternary sequences of India is also given.The importance of calcretes and their evaluation in the Himalayan foreland for obtaining insights on Cenozoic climates is highlighted. Possibilities of future studies on calcretes and related palaeosols include: (a) the application of gradualistic pedofacies model in the well developed alluvial sequences of the Siwalik Group and the Gondwana Supergroup, (b) the identification of lowstand systems tract in the marginal marine basins of India, and (c) understanding the directions of climate changes in the Indian stratigraphic record.