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Ahmad, A. H. M.
- Detrital Mineralogy and Provenance of Nimar Shale (Lower Cretaceous), NE Gujarat
Authors
1 Department of Geology, Aligarlz Muslim University, Aligarh - 202 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 42, No 1 (1993), Pagination: 95-97Abstract
No Abstract.- Petrofacies, Provenance and Tectonic Setting of Nimar Sandstone (Lower Cretaceous), Rajpipla-Jobat Area
Authors
1 Department of Geology, Aligarh Muslim University, Aligarh-202002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 44, No 5 (1994), Pagination: 533-539Abstract
The Nimar Sandstone were studied with a view to understanding the nature of the Narmada basin and its tectonic setting during an important event which took place on a global scale. The sandstones are predominantly quartzarenitcs composed mainly of several varietics of quartz, mica, rock fragments, feldspar and heavy minerals derived from the underlying Plecambrian basement. An integrated approach suggests that the Nimar Sandstone was derived from fault-bound uplifts of continental basement rocks and accumulated without much transport in the incipient rift belt of the Narmada basin.Keywords
Sedimentology, Tectonics, Nimar Sandstone, Cretaceous, Gujarat.- Control of Depositional Environments on Texture of Clastic Deposits of Cretaceous Basins, Western India
Authors
1 Dept. of Geology Aligarh Muslim University Aligarh-202 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 45, No 6 (1995), Pagination: 709-710Abstract
No Abstract.- Tectono-Provenance and Diagenesis of Habo Dome Sandstone, Chari Formation, Kachchh, Western India
Authors
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
Authors
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), Nakhtarana Area, Kachchh, Gujarat
Authors
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
Authors
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.- Tectonic Significance of Syn-Sedimentary Volcanism: Evidence from Sandstone Detritus, Bayana Basin, Delhi Supergroup
Authors
1 Department of Civil Engineering, Aligarh Muslim University, Aligarh - 202 002, IN
2 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 4 (2006), Pagination: 648-656Abstract
This study mainly deals with the sandstone lithofacies and petrofacies of Jahaj-Govindpura Formation of the Raialo Group, rich in volcaniclastics, exposed near Hathori village. These cross and planar bedded sandstones are medium grained poorly sorted, and are cemented mainly by iron oxide, carbonate and by matrix rich in phyllosilicates and vitrofelsitic material. The sandstone petrofacies arc rich in detrital modes suggestive of metamorphic source terrain as well as juvenile volcanic 1ithic fragments with textual and mineralogical characteristics typical of neo-volcanic source which was very near to the basin. The underlying clastics of Raialo Group and the overlying formations represented by the Alwar and Ajabgarh Groups of the Jahaj-Govindpura volcanics respectively, do not have a notable amount of volcanic lithics. This suggests that the volcanism was intrabasinal, took place for a shorter time period and was not vety explosive. While the sedimentation continued in this basin, detritus from the highs exposing the BGC and Aravalli Supergroup of rocks in SE and SW were mixed with intrabasinal volcaniclastics. These volcanic highs then may have been carapaced by younger sediments which were deposited in linear rift zones and were eroded from an "Accreted Basement Provenance" comprising Banded Gneissic Complex and Aravalli Supergroup in a short time span.Keywords
Syn-Depositional Volcanism, Sandstone, Lithofacies, Petrofacies, Tectonic Setting, Bayana Basin, Aravalli-Delhi Fold Belt, Rajasthan.- Petrofacies and Diagenesis of Bayana Basin Conglomerates (Delhi Supergroup), Bharatpur District, Rajasthan
Authors
1 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, Uttar Pradesh, IN
2 Geology Section, Department of Civil Engineering, Aligarh Muslim University, Aligarh-202 002, Uttar Pradesh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 3 (2005), Pagination: 335-345Abstract
The Bayana Sub-Basin comprises thick sequence of metavolcanics and metasedimentary rocks belonging to Delhi Supergroup. The deposition of sediments took place in response to vertical tectonism during Middle Proterozoic in fluvial and shallow marine environments. The rocks are mainly clastics and include conglomerate, sandstone and shale.The conglomerate lithofacies and petrofacies were studied with a view to understand the tectonic setting of the provenance and the basin. The conglomerate matrix consist of framework detrital grains such as several varieties of quartz followed by rock fragments, mica, feldspar, and heavy minerals. The Qt-F-L, Qm-F-Lt, Qp-Lv-Ls and Qm-P-K diagrams suggest continental block, recycled orogen provenance, rifted continental margin type of basin setting and overall maturity and stability of the continental block provenance. The cement phases in conglomerate matrix consist of iron oxide, silica, carbonate and barite. Dominance of floating, point and long contacts indicates that the sand grains did not suffer much pressure solution.
Keywords
Conglomerate, Petrofacies, Diagenesis, Bayana Sub-Basin, Delhi Supergroup, Bharatpur, Rajasthan.- Petrofacies and Diagenetic Study of Rewa Sandstone, Baretha Area (Bayana), Bharatpur, Rajasthan
Authors
1 Department of Geology Aligarh Muslim University, Aligarh - 202 002, U P, IN
2 Geology Section, Department of Civil Engineering, Aligarh Muslim University, Aligarh - 202 002, U P, IN
3 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, U P, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No 6 (2004), Pagination: 731-738Abstract
The studied rocks form a part of Upper Rewa Sandstone, which overlies the Kaimur Sandstone in northwest part of the Vindhyan basin, exposed in various isolated ridges around Baretha area of Bayana, Bharatpur district of Rajasthan The sandstones are medium to fine grained and moderately well sorted to well sorted The sandstones consist of various types of quartz followed by feldspar, rock fragments, mica and heavy minerals The petrofacies in Qt-F-L, Qm-F-Lt, Qp-Lv-Ls and Qm-P-K ternary diagrams suggest mainly basement uplift source of craton intenor in rifted continental margin type basin setting with very low input from recycled orogen provenanceThe sandstones are well compacted and dominated by interpenetrative contacts and are mainiy cemented by silica with very small amount of carbonate and Iron oxide Quartz overgrowths are well developed on monocrystalline quartz than polycrystalline ones Coarser fraction of detrital quartz grains have sequestered authigenic overgrowths covering more of its grain boundary and are thicker as compared to finer grains Dissolution of quartz along gram boundaries and silica rich compaction pore water seems to be the main source of silica.
Keywords
Sedimentary Petrology, Petrofacies, Diagenesis, Rewa Sandstone, Vindhyan Basin, Rajasthan.- Palaeoenvironment and Diagenesis of Middle Jurassic Athleta Sandstone, Jhurio Dome, Kachchh, Gujarat
Authors
1 Department of Geology, AJigarh Muslim University, Aligarh-202002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 1 (2008), Pagination: 73-78Abstract
The Middle Jurassic Athleta Sandstone of Jhurio Dome is mainly medium grained, moderately sorted to moderately well sorted, subarkose and is composed of four major lithofacies representing near shore tidal environments. Iron oxide, silica and glauconite cements mark the sandstones. Compaction is mainly mechanical and sandstones show good amount of porosity. Porosity reduction is mainly due to mechanical compaction in the early stage of diagenesis and subsequent pervasive iron oxide cementation.Keywords
Depositional environment, Athleta Sandstone, Middle Jurassic, Jhurio Dome, Kachchh, Gujarat.- Genesis and Diagenetic Evolution of Habo Formation, Kachchh, Gujarat
Authors
1 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 4 (2010), Pagination: 331-344Abstract
The Kachchh Basin is a pericratonic rift basin situated at the western margin of the Indian plate. The Habo Dome embodies an important exposure of Bathonian to Kimmergian sediments among the Kachchh Mainland exposures. Based on vertical facies transitions, facies associations were documented: mixed shallow marine (Facies association 1), shoreface and lagoon deposits (Facies association II) and subtidal innershelf below fair weather wave base (Facies association III). The documented facies associations reflect that Habo Dome sediments deposited in a variety of environments from shallow marine to fluvio-deltaic and were strongly influenced by fluctuation of relative sea level. The dominance of floating grains and point contacts in the sandstone indicate that detrital grains do not show much pressure effects as a result of either shallow burial or early cementation. The sandstones were cemented by iron oxide, carbonate and silica in order of abundance. Three types of cements, blocky, rim and fibrous cement occur in the studied limestone representing phreatic, fresh water phreatic and deep burial diagenetic stages. Neomorphism and micritization are common. Both primary and secondary porosity exists in these sediments. Different graphs of porosity versus depth suggest a depth of burial in the range of 615-769 m.Keywords
Sandstone, Facies Analysis, Depositional Environment, Petrography and Diagenesis, Kachchh, Gujarat.- Facies Controlled Diagenetic Evolution of the Delhi Group Sandstones, Bayana Basin, Rajasthan
Authors
1 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, IN