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Bhat, G. M.
- Cyanophyta (Girvanella) as Micrite Contributors to Permo-Triassic Limestones of Pirpanjal Range, Kashmir Himalaya
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Authors
Affiliations
1 Geology Department, Jammu University, Jammu Tawi, IN
1 Geology Department, Jammu University, Jammu Tawi, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 36, No 4 (1990), Pagination: 439-444Abstract
Two species of Girvanella (G. ducii and G. wetheredii) have been observed during the course of microfacies analysis of limestones of Pirpanjal range. Observations made on three types of Girvanella clasts (tubules, rafts and oncolites) and the associated allochems have revealed calcified algal contribution to the sediments in the form of algal clasts and production of micrite by boring and perforating activities of the Girvanella. The preservation of porous and delicate Girvanella rafts indicates very little reworking prior to transport and deposition.Keywords
Palaeontology (Invertebrate), Permo-Triassic, Pirpanjal Range, Cyanophyta, Kashmir.
- Petrographic and Facies Evaluation of Middle Siwalik Subgroup of Jammu, Himalaya
Abstract Views :151 |
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Authors
S. K. Pandita
1,
G. M. Bhat
1
Affiliations
1 Department of Geology, University of Jammu, Jammu - 180004, IN
1 Department of Geology, University of Jammu, Jammu - 180004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 46, No 4 (1995), Pagination: 369-374Abstract
This paper embodies the results on the study of depositional environment, provenance and tectonic setting of Middle Siwalik Subgroup of Jammu region. The data obtained on lithofacies, sedimentary structures and nature of contacts between various lithofacies, suggest multiple episodes of avulsion and abandonment of the channel system for a new course in braided river system. Four variable plot of quartz types shows that these sediments have been derived from low rank metamorphic source. The detrital modes (quartz, feldspar and lithic fragments) plotted on complementary ternary diagrams (QFL and QmFLt) indicate that these sediments have been shed from recycled orogens, transitional arc and transitional continental provinces.Keywords
Sedimentology, Siwalik, Jammu, Himalaya.- Temporal Patterns of Palaeoflows of Middle and Upper Siwalik Subgroups, Jammu
Abstract Views :183 |
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Authors
S. K. Pandita
1,
G. M. Bhat
1
Affiliations
1 Department of Geology, University of Jammu, Jammu - 180 004, IN
1 Department of Geology, University of Jammu, Jammu - 180 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 48, No 2 (1996), Pagination: 211-219Abstract
This paper embodies the results of palaeocurrent analysis of two stratigraphic sections exposed at Parmandal-Uttarbani and Papar-Nad, Jammu. The general palaeoflow patterns are due south-southwesteriy with the temporal palaeoflow variations of 40°-183° and 41°-144°for the Middle and Upper Siwalik Subgroups respectively. In the Middle Siwalik Subgroup of Papar-Nad section and Upper Siwalik Subgroup of Parmandal-Uttarbani section, four palaeoflow reversals have been recorded. The temporal palaeoflow patterns and the reversals are related to the tectonic episodicity of the intrabasinal tectonic structures and the basin margin activity.Keywords
Sedimentology, Palaeocurrents, Siwalik, Jammu, Himalaya.- Tectono-Provenance and Diagenesis of Habo Dome Sandstone, Chari Formation, Kachchh, Western India
Abstract Views :238 |
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Authors
Affiliations
1 Department of Geology, Aligarh Muslim University, Aligarh – 202 002, IN
2 Department of Geology, University of Jammu, J & K, IN
1 Department of Geology, Aligarh Muslim University, Aligarh – 202 002, IN
2 Department of Geology, University of Jammu, J & K, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 6 (2008), Pagination: 790-800Abstract
The Habo Dome Sandstone of Chari Formation has been analyzed for petrofacies and diagenetic history. The sandstones are generally medium to coarse grained and moderately to well sorted. These sandstones are composed of several varieties of quartz, feldspar, rock fragments, micas and a suit of heavy minerals derived from the Aravalli Range and Nagarparkar massif. The petrofacies analysis reveals that these sandstones belong to the continental block, recycled orogen and rifted continental margin tectonic regime.
During mechanical compaction rearrangement of grains took place and point and long contacts were formed. The sandstones were cemented by calcite, iron oxide, silica, chalcedony and glauconite cements in order of abundance. Different graphs of porosity versus depth suggest a depth of burial in the range of 615 to 769m.
Keywords
Habo Dome, Chari Formation, Petrofacies, Diagenesis, Kachchh, Gujarat.- Depositional and Diagenetic Environments Vis-à-vis Reservoir Characteristics of the Carbonates of Jhurio formation (Early Late Bathonian), Jumara Dome, Kachchh, Western India
Abstract Views :183 |
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Authors
Affiliations
1 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, IN
2 Postgraduate Department of Geology, University of Jammu, Jammu - 180 006, IN
1 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, IN
2 Postgraduate Department of Geology, University of Jammu, Jammu - 180 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 4 (2007), Pagination: 710-723Abstract
This paper describes 10 microfacies types in the Jumara Coral Limestone and Echinoderm Packstone Members (early Late Bathonian age) of Jhurio Formation of the Jumara Dome. The temporal distribution of these microfacies associations reflects an ideal shallowing upward sequence, representing a system of bioclastic bars separating the basin from lagoon environment. Evidence suggests evolving of this bioclastic bar system upward into an oolitic Bar-to-Bank system. Three types of cements (bladed to fibrous, blocky and syntaxial overgrowth) occur in these carbonates. The study also reveals that chemical compaction followed the two phases of early mechanical compaction that largely governed porosity of these limestones. Diagenetic signatures in these carbonates suggest that marine phreatic, under saturated fresh water phreatic and mixing marine fresh water phreatic environments dominated but deep burial diagenesis also played its role in shaping these rocks through time. Evidence suggests that both primary and secondary porosity exist in these carbonates, which determine the permeability in these rocks.Keywords
Carbonates, Depositional Environments, Diagenesis, Jurassic, Jumara Dome, Kachchh, Gujarat.- Petrography, Diagenesis, Provenance and Tectonic Setting of the Sandstones of Upper Katrol formation (kimmeridgian), Nakhtaran Area, Kachchh, Gujarat
Abstract Views :158 |
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Authors
S. K. Biswas
1,
G. M. Bhat
2
Affiliations
1 201/C, ISM House, Thakur village, Kandivalli (E), Mumbai - 400 101, IN
2 P.G. Department of Jammu, University of Jammu, Jammu - 180 006, IN
1 201/C, ISM House, Thakur village, Kandivalli (E), Mumbai - 400 101, IN
2 P.G. Department of Jammu, University of Jammu, Jammu - 180 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 4 (2007), Pagination: 867-869Abstract
No Abstract.Full Text
- Petrography, Diagenesis, Provenance and Tectonic Setting of the Sandstones of Upper Katrol Formation (kimmeridgian), Nakhtarana Area, Kachchh, Gujarat
Abstract Views :191 |
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Authors
Affiliations
1 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, IN
2 PG Department of Geology, University of Jammu, Jammu - 180 006, IN
1 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, IN
2 PG Department of Geology, University of Jammu, Jammu - 180 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 2 (2006), Pagination: 243-253Abstract
The sandstones of the Upper Katrol Formation were studied with a view to understand the nature of Kachchh basin in relation to provenance and tectonic setting in the vicinity of Nakhtarana area. These Upper Katrol sandstones are fine to coarse grained, moderately to poorly sorted, sub-Angular to sub-Rounded and of moderate sphericity. These sandstones are composed of several varieties of quartz, feldspar, rock fragments, micas and a suite of heavy minerals derived from the Aravalli Range and Nagarparkar massif. Our study reveals that these sediments were derived from the continental block orogen provenance characterized by collision suture and fold thrust belts. Three types of cement encountered in this study include iron oxide, calcite and silica. Evidence of diagenetic modifications suggests an early stage of burial to a depth of 748 to 932 m for these sandstones. Porosity reduction is mainly due to early stage mechanical compaction and subsequent pervasive calcite and Fe-Calcite cementation, which was followed by the late stage authigenic kaolinization in the secondary pore space.Keywords
Katrol Formation, Kimmeridgian, Sandstones, Petrography, Diagenesis, Tectonic Provenance, Nakhtarana, Gujarat.- Provenance of Glauconitic Sandstones of Kheinjua Formation of Semri Group, Son Valley, Central India: Evidence for Uplift of a Rifted Continental Margin Basin
Abstract Views :201 |
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Authors
Affiliations
1 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, IN
2 PG Department of Geology, University of Jammu, Jammu, IN
1 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, IN
2 PG Department of Geology, University of Jammu, Jammu, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 2 (2006), Pagination: 288-298Abstract
The paper embodies results of petrofacies, detrital mineralogy, texture and diagenetic aspects of glauconitic sandstones of Kheinjua Formation of Vindhyan Basin, Son valley These glauconitic sandstones consisting of various types of quartz, feldspar, rock fragments, mica and a sulte of heavy minerals, are medium to very fine grained, and well to moderately well sorted These sediments including glauconite grams are generally subangular to subroundcd with a few grams bang well rounded These sandstones are well compacted and dominated by interpenetrative contacts and are maniy cemented by iron cement with small amount of glauconite and silica cement The existing optical poroslly has developed due to dissolution of Iron cement, feldspar and rock fragments These observations suggest progressive compaction, which initiated at the sediment-water interface and continued till deep bunal diagenesis in a rapidly subsiding basin
The plots of petrofacies in Qt-F-L, Qm-F-Lt, Qp-Lvm-Lsm and Qm-P-K ternary diagrams suggest mainly basement uplift source (craton interior) In a rifted continental margin basin setting, which has also received sediment Input from recycled orogen provenance The plot of various quartz types on diamond diagrarn after Basu et a1 (1975) reflects derivation of the sediments from the plutonic and middle to high-rank metamorphic terrains Besides, Lower part of the Semri Group, the most probable provenance of these sandstones IS Bijawar metasedimentary and Bundelkhand Gneissic complexes, which bordered the basin in the north and northeast.
Keywords
Sandstones, Petrofacies, Provenance, Tectonic setting, Vindhyan, Son valley, Central India.- Depositional Settings of Early Carboniferous Siliciclastic-Carbonate Succession (Syringothyris Limestone) of Kashmir Himalaya
Abstract Views :183 |
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Authors
Rajinder Singh
1,
G. M. Bhat
1
Affiliations
1 PG. Department of Geology, University of Jammu, Jammu -180006, IN
1 PG. Department of Geology, University of Jammu, Jammu -180006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 5 (2002), Pagination: 431-445Abstract
Early Carboniferous sequence of Kashmir represents a mixed siliciclastic - carbonate strata, where the lower part is dominated by carbonates and the upper part is rich in siliciclastic rocks. Siliciclastic sediments are mainly arenite, siltstone and claystone. Coarse grain size and bimodality of arenites suggest a high energy environment in the onshore region. Lithofacies and microfacies analyses of the carbonates reveal that they are deposited as turbidite either in the deeper part of the shelf or in the distal part of shelf/slope. Some of the carbonate facies, reflecting shallower microfacies, is deposited on the platform in subtidal and intertidal (peritidal) zone.The increase of siliciclastic material in the depositional basin indicates progradational phase of sedimentation which in turn suggests the lowering of sea level. These deposits represent peritidal (intertidal to subtidal) lithofacies. In fact, there has been retrogradational and progradational phases of sedimentation in the Tethyan basin of Kashmir, but the frequency of siliciclastics increases from middle to top of the Syringothyris Limestone. This feature'suggests the overall shallowing of the basin, but intermittent deposition of carbonates reveals the periodic transgression or subsidence of the depositional basin.
Keywords
Syringothyris Limestone, Microfacies, Turbidite, Depositional Basin, Kashmir Himalaya.- Microfossils from the Nagrota Formation, Upper Siwalik Subgroup, Jammu Hills
Abstract Views :187 |
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Authors
Affiliations
1 House No. 441, Sector 6, Panchkula-134 109, IN
2 PG. Department of Geology, University of Jammu, Jammu - 180 006, IN
1 House No. 441, Sector 6, Panchkula-134 109, IN
2 PG. Department of Geology, University of Jammu, Jammu - 180 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 6 (2001), Pagination: 509-518Abstract
The paper records for the first time a small, but interesting microfossil assemblage from the mudstonc beds, underlying the bentonitized tuff band (2.8±0.56 Ma) of the Nagrota Formation, Upper Siwalik Subgroup, Jammu Hills at two localities - Bada Khetar and Uttarbehani. The assemblage comprising ostracodes, charophyte gyrogonites and angiosperm seeds, indicates an Upper Tatrot (Late Pliocene) age and deposition in shallow alkaline lake(s) at depth ranging from 2 to 6 m.Keywords
Nagrota Formation, Upper Siwalik, Late Pliocene, Lacustrine, Ostracodes, Charophyta, Angiosperm Seed.- Turbidite to Storm Transition Sedimentation during Early Carboniferous, Kashmir Himalaya
Abstract Views :210 |
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Authors
Affiliations
1 Geology Dept., University of Jammu, Jammu - 180 004, IN
1 Geology Dept., University of Jammu, Jammu - 180 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 49, No 5 (1997), Pagination: 545-558Abstract
This work, based on sedimentological data collected from two stratigraphic sections at Lambar and Malvat (Banihal area), reports the turbidite to storm influenced sedimentation of "Syringothyris Limestone" sequence, Kashmir Himalaya. An upward progresssion of the sequence reflects the depositional record of fine grained turbidite to storm - and wave - influenced sedimentation. Sedimentary structures like short wave length symmetrical ripples. flat lamination, thin graded bedding and structures in muddy siltstones suggest deposition in low energy, wave influenced settings, The storm influenced sediments display hummocky, cross stratification. skolithos ichinofacies, granule/shelly lags, mega ripples, low angle cross lamination and convolute lamination. The whole sequence is interpreted to represent episodic storm influenced sedimentation in a shallow basin, largely controlled by tectonic activity, The Markov Chain models structured for this sequence also suggest episodic sedimentation and do not show any cyclicity,Keywords
Sedimentology, Syringothyris Limestone, Turbidites, Carboniferous, Kashmir Himalaya.- Reservoir Induced Landslide at Assar, Jammu and Kashmir: A Case Study
Abstract Views :692 |
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Authors
Affiliations
1 Department of Geology, University of Jammu, Jammu - 180 006, IN
1 Department of Geology, University of Jammu, Jammu - 180 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 3 (2012), Pagination: 435-439Abstract
In February 2009, a huge landslide occurred at Assar in Doda district of Jammu and Kashmir state. The slide triggered after the reservoir level of the Baglihar dam increased from initial water level of 850 m to 870 m. The impounding of reservoir water created high angle scarps at number of fossil slide sites on either side of the river within the reservoir area. One such scarp (about 250 m long) at Assar caused a huge landslide washing out about 150 m road stretch. The sliding material is dominated by finer fraction (71.5 %) of micaceous silty sand and coarser fraction of gravel to boulder size. Over saturation of the slope forming material, weak rocks and high absorption and swelling nature of the soil, high slope angle and toe cutting by the water are the main reasons that triggered this slide.Keywords
Landslide, Pore Water Pressure, Assar, Doda, Baglihar, Jammu.References
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- RAWAT, R.K., TRIVEDI, R.K. and SONI, LOVELESH (2007) Patalkot Landslide, Madhaya Pradesh - A Case Study. Jour. Geol. Soc. India, pp.344-346.
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- SINGH, TRILOCHAN and DEVI, MRINALINEE (2006) Landslide Occurrence and Risk Assessment in Itanagar Captial Comlex, Arunachal Himalaya. Himalayan Geol., v.27(2), pp.145-162.
- SINGH,YUDHBIR (2006) Geotechnical and Structural Evaluation of Tectonostratigraphic units along the National Highway (NH-1A) between Udhampur and Batote, Jammu Himalaya Jammu & Kashmir (India). Unpubld. Ph.D. Thesis University of Jammu, Jammu.
- WADIA, D.N. (1934) The Cambrian-Triassic Sequence of Kashmir. Mem. Geol. Surv. India, v.68(2), pp.121-176.