bluuebunny/crossref_metadata_2025_split huggingface dataset:
Textural Characteristics of the Visakhapatnam Shelf Sediments
Authors: Satyanarayana Murty P. , Rao K. S. 
Published: November 2024

Abstract
Textural parameters, viz., mean, standard deviation, skewness and kurtosis and CM patterns in respect of 150 offshore sediments from the continental shelf off Visakhapatnam enabled delineation of two distinct sedimentary facies, one in the northern sector (Visakhapatnam - Bheemunipatnam) and the other in the southern sector (Visakbapatnam - Pudimadaka). The sedimentary facies in northern sector includes sands (from coast up to 37 m) followed offshore by silty sands (up to 50 m), sandy silt (up to 70 m) and silts (up to 80 m) and that in the southern sector, sands (up to 30 m), silty sands (between 30 - 40m and 50 - 80 m) followed offshore by sandy silts (between 40 - 50 m). There is a progressive seaward fining of sediments in the southern sector, whereas in the northern sector the fining is towards both sea and land. Fining of sediments with depth, a feature common to open shelves, is attributed to wave action. Distribution of medium sand zone in the northern sector between 15 to 40 m along the coast has been considered to be the result of dumping of dredged out material from the nearby port area. A major part of the study area is floored by poorly-sorted sediments. Skewness values of the sediments in the southern sector increase uniformly with depth whereas they show more complex pattern in the northern sector. Leptokurtic sediments bordering the coast in the northern sector indicate removal of fines through wave and current activity. CM diagram indicates the prevalence of low to moderate current activity in the south and highly turbulent zones in the north.
On Deciphering the Two Scales of the Regional Bouguer Anomaly of the Deccan Trap and Crust-Mantle Inhomogeneities
Authors: Mishra D. C. 
Published: November 2024

Abstract
Regional Bouguer anomaly over the Deccan Trap (south of Poena) is modelled, constraining it from Deep Seismic Sounding (DSS) studies. A regional, based on the normal Moho obtained from DSS studies along a profile, provides a broad 'hump' over the trap. The residual Bouguer anomaly consists of 'lows' which are modelled in the form of undulations of the Moho (37-41 krn) and Conrad (17-21 km) discontinuities and their rise towards the coast conforming with the DSS studies. These depressions of the Moho and Conrad discontinuities coincide with high plateaus on the surface on either side of river Bhima suggesting them to be caused by local isostanc compensation. The broad regional hump is attributed to the high density inhomgeneities in the upper mantle, approximately at a depth of 130-200 krn which also seem to be reflected in higher P-wave residuals in the teleseismic experiments conducted in this region. It is suggested that this upper mantle inhomgeneity could be due to the erosional unloading of the Deccan traps dod may represent some form of regional compensation. Therefore, two kinds of compensation are basically suggested in this region, namely, local in the form of variations in the level of the lower crust and regional in the form of high density mhomogeneity in the upper mantle. This analysis, therefore, does not support the suggestion of the existence of any sediment-filled rift valley under the traps in this region.
Cluster Analysis and Distribution of Recent Foraminifera, Araniar River Estuary, Tamil Nadu, India
Authors: Reddy A. N. , Reddy K. R. 
Published: November 2024

Abstract
Both living and dead Foraminifera were collected from 15 sampling stations in the Araniar river estuary, along the east coast of India for a period of one year. The distribution of the species has been studied with respect to time and space. Based on the Q-mode cluster analysis of the foraminifera, three major biotopes have been recognised, one of which has been subdivided into three sub-biotopes, based on the change in the level of correlation.
Characterization of Nickeliferous Laterite of Sukinda in Cuttack District, Orissa
Authors: Sahu K. C. , Venkateswaran D. 
Published: November 2024

Abstract
Weathering experiments have been carried out in laboratory with peridotitic rocks 10 understand the mechanism of mobilization and pattern of dispersion of nickel in vertical profile. Since goethite constitutes the principal mineral constituent in the nickeliferous laterite, synthetic goethite has been precipitated at various pH levels and in presence of varying nickel content in solution. The distribution of nickel in the precipitates has been recognised in terms of crystallinity and particle size of the goethite phase. The observation has been correlated with natural laterite samples collected from vertical profiles of Sukinda lateritic field. It is observed that while the amorphous hydrated iron-oxide has acted as a scavenger of cobalt and nickel from the precipitating solution, the nickel cations tend to inhibit crystallization of goethite. The present finding is considered useful for extraction of the metal from the lateritic matrix.
Godavari Delta System - A Wave-Dominated Delta System as Interpreted from Seismic Data has Hydrocarbon Potential
Authors: Dewan P. K. 
Published: November 2024

Abstract
Modern deltas can be classified mainly into three types: fluvial dominated, wave dominated and tide-dominated delta. Geometry of shoreline and palaeoshore line, dominance of strand-plain environment and other geomorphological and sedimentological features indicate the present Godavari delta to be wave dominated delta system. Seismic reflection patterns are predominantly parallel to subparallel, indicative of delta plain environments. Progradational shingled and oblique (parallel) reflection configuration is observed in different seismic sequences. Stratigraphic hydrocarbon reservoirs can be expected in wave-dominated environment.
Neogene-Quaternary Boundary in the Siwalik of Northwest Himalayan Foothills, India
Authors: Ranga Rao A. 
Published: November 2024

Abstract
Magnetic Polarity stratigraphy of the Upper Siwalik has been worked out along four traverses on the Surin-Mastgarh anticline, Jammu and Kashmir State. Fission-track dating of the bentonite beds allows correlation to the accepted magnetostratigraphic scale and identification of the Olduvai Normal Subchron in the Upper Siwalik sections.
The Vrica section, Italy, is now selected as the Pliocene-Pleistocene Boundary stratotype and the Pliocene-Pleistocene boundary is fixed above the Olduvai at 1.64 Ma, In the Upper Siwalik, at 1.64 Ma, there is no change either in the mammalian fauna or in lithology and life and sedimentation appears to have continued without any change. On the otherhand, a faunal change occurs at the Gauss-Matuyama transition dated at 2.48 Ma which is correlated to Tatrot-Pinjor faunal boundary. It is, therefore, suggested here that it is more practical to make the Pliocene-Pleistocene Boundary in the continental Siwalik to coincide with the base of Pinjor faunal boundary.
The Archaean Komatiites of Nagamangala Supracrustal Belt, Karnataka
Authors: Srikantia S. V. , Venkataramana P. 
Published: November 2024

Abstract
The meta-ultramafites of the Archaean Nagamangala belt of Karnataka craton display pillow structures and have kornatiitic chemistry. This is in conformity with other ancient supracrustals of Karnataka craton having komatiitic association.
Textural Study and Depositional Environment of Sand Grains from Rocks of Jaisalmer Formation, Jaisalmer District, Rajasthan, India
Authors: Mahender K. , Banerji R. K. 
Published: November 2024

Abstract
The textural parameters of sand grains from rocks of Jaisalmer Formation were systematically analysed for reconstruction of the depositional environment. These sands are fine- to medium-grained, moderatety sorted to well sorted, negatively to positivety skewed, and leptokurtic, The variations in mean size, sorting, skewness and kurtosis indicate a change in environmental energy conditions. The environmental interpretations based on various bivariate and multivariate plots of size and shape parameters indicate river transportation of these sands and deposition in a beach- to shallow-marine environment. The surface textures of these sand grains reveal transportation in an aqueous media and deposition in a shallow-marine littoral environment. The subangular to subrounded shape and the presence of abundant feldspars and mica show that these sands are less matured and have undergone little of transportation mostly through saltation process from a nearby source.
Record of Redlichiid Trilobite from tbe Lower Cambrian Tal Formation, Mussoorie Syncline, Lesser Himalaya, India
Authors: Mathur V. K. , Joshi Ashutosh 
Published: November 2024

Abstract
This note records the presence of the Lower Cambrian trilobite Redlichia noetlingi and an unidentified trilobite in association with brachiopods from the basal part of the Phulchatti Member of the Tal Formation in the Mussoorie Syncline, Uttar Pradesh.
The Nature of Bedrock at Petermann I, Wohltbat Range, Antarctica
Authors: Hussain S. M. 
Published: November 2024

Abstract
During the 6th Indian Scientific Expedition to Antarctica, geological and geochemical studies were carried out in the Schirmacher oasis and the Petermann I areas of Wohlthat ranges in Antarctica. The greasy-looklng porphyroblastic bedrock of Petermann I area described in this report ranges in composition from 'quartz-alkali feldspar syenite' to ' alkali-feldspar granite'.
Evaluation of Some Petrophysical Parameters for the Lower Cretaceous Reservoir Rocks, Western Desert, Egypt
Authors: El-Sayed Land A. A. , El-Dairy M. D. 
Published: November 2024

Abstract
Water saturation in otherwise hydrocarbon-saturated sandstones is closely related to the sandstone's clay mineralogy. Laboratory analysis of 20 sandstone core samples containing kaolinite, illite and chlorite is used to provide the basis for deciding which petrophysical parameters are most suitable for evaluating clay mineral content and distribution. Among the measured petrophysical parameters, the Mounce potential gives the most realistic correlation with actual clay mineralogy.
The existence of both siderite and hematite as cementing materials within the Kharita sandstone pore spaces, reduces the cation-exchange capacity of clay minerals by a clogging action. Consequently, the Mounce potential has been diminished. Correlations of the measured petrophysical properties have been elucidated to throw some light on both the Alam El-Buieb and Kharita reservoir rocks.
A Reinterpretation of the Geology and Biostratigraphy of the Lower Tertiary Formations exposed along the Bilaspur-Shimla Highway, Himachal Pradesh, India
Authors: Batra R. S. 
Published: November 2024

Abstract
The present paper offers a new interpretation of the geology and biostratigraphy of the Lower Tertiary Formations exposed on the Bilaspur-Shimla Highway, Himachal Pradesh. The structural interpretation of the frequent repetition of the Subathu-Dagshai Formations have been made in the light of presently recognised faunal zones in the upper part of the Subathu Formation. Geological mapping, coupled with palaeontological observations. reveal that the repetition of the Subathu (Green facies cf. Raiverman and Raman, 1971) and Dagshai (Red facies cf. Raiverman and Raman, 1971) Formations on the BiJaspur-Shimla Highway can be better explained by folding and faulting instead of facies intertonguing.
Comparison of Burial Diagenesis in some Deltaic to Shallow Marine Reservoir Sandstones from Different Basins
Authors: Imam Md. Badrul 
Published: November 2024

Abstract
Strikingly similar diagenetic histories of the deltaic to shallow-marine sandstones from the Bengal basin, the Gulf Coast basin, the Denver basin and the North Central Texas, have been noted. The diagenetic events include an initial phase of compaction and cementation with sequentially developed authigenic clay rims, quartz overgrowth and calcite cements, a secoud phase of secondary porosity development by rock component dissolution and a final less important phase of recementation with kaolinite and 'other cements. All the sandstones have comparable detrital composition and textural properties. Similarities. in depositional environments have contributed to establish similar set of facies relationships among sandstones and shales in terms of sand body geometry. sand-shale ratio, sedimentary texture etc. in these sequences. Inorganic and organic diagenetic reactions in shales have influenced the composition of their contained water that migrated during compaction into the adjacent sandstone into which mass transfer from shales is supposed to have taken place. The above factors presumably . lead to similar sort of fluid flux and fluid composition in the sandstones, meaning that the pore fluid evolution in the above sandstones have common links. It is envisaged that these common links are perhaps responsible for the similarities in the diagenetic events in all these sandstones.
Mineragraphy of Gold-quartz-Sulphide reefs of the Mangalur Greenstone Belt, Karnataka
Authors: Ugarkar A. G. , Tenginkai S. G. 
Published: November 2024

Abstract
Gold mineralization of gold-quartz vein-type is confined to narrow shear zones in the metabasic volcanic suite of the Mangalur Greenstone Belt. The dominant sulphide phase associated with the gold mineralization is pyrrhotite-pyrite assemblage followed by arsenopyrite, chalcopyrite and sphalerite in the decreasing order of abundance. Gold occurs in native state and within quartz.
Origin and Evolution of the Kalijhora Point Bar on Tista River, Darjeeling District, West Bengal
Authors: Chakraborty Shampa , Chakraborty Sujit K. 
Published: November 2024

Abstract
A point bar about 1.83 km long on River Tista shows gravel, ranging in size from pebble to boulders shows horizontal bedded structure forming the dominant sediment type. A largely upper flow regime condition is indicated. Comparison of maps prepared at different times indicates the bar to be stable in location but undergoing only changes in shape.
Geochronology of Miliolite Rocks of Kutch, Western India
Authors: Baskaran M. , Deshpande S. V. , Rajaguru S. N. , Somayajulu B. L. K. 
Published: November 2024

Abstract
Preliminary geochemical, mineralogical and geochronological studies using 230Th/234U method, of nine rniliolite rocks from Kutch are reported. The Kutch miliolites are characterised by lower CaCO3and higher quartz contents compared to their Saurashtra counterparts. The range of ages for the Kutch and Saurashtra miliolites are same and both can be accommodatedin the 50-70, 75-115 and &gt; 140 K. Yr age groups proposed by Baskaran (1985).
The origin of the Kutch miliolites, like those of Saurashtra, appears to be marine. Theories to explain their occurrence in Kutch have to await more detailed studies of this type alongwith ichnological and petrographic observations.
Significance of Syndepositional Tectonics in Facies Development, Gangetic, Alluvium near Kanpur, Uttar Pradesh
Authors: Singh Indra Bir , Bajpai V. N. 
Published: November 2024

Abstract
Gangetic Plain, an active foreland basin shows N to NE flowing rivers in the southern part, controlled by the basement lineaments; while in the central part most of the rivers flow SE to E, following partly the lineaments developed in response to the Himalayan tectonics. Analysis of the subsurface data in Hamirpur-Kanpur-Unnao region shows that just south of present-day Ganga River, along an E-W trending lineament major change in the alluvial thickness and facies has taken place. It is suggested that earlier (probably Middle Pleistocene) rivers from Peninsular India flowing upto Kanpur, shifted their course southwards, and onlapped by Himalayan rivers and their deposits. It is argued that in 'an active foreland basin, lineaments parallel to orogen may develop, some of them even as gravity faults affecting the basement. These lineaments have a strong control on drainage, and thickness of the alluvial fill.
Upper Bhander Sandstone: An Example of Barrier Beach Deposits from Tantpur area, District Agra, Uttar Pradesh, India
Authors: Bhardwaj B. D. , Mathur N. K. 
Published: November 2024

Abstract
The Upper Bhander Sandstone occurring in the Tantpur area consists of red, brown and dirty white orthoquartzite with intercalations of shales. The sandstone is texturally and mineralogically mature. The palaeocurrent pattern worked out with the help of primary sedimentary structures reveals that the direction of the sediment transport remained north-westerly. The coarsening upward of the sequence, sedimentary structures, elongated sand bodies and polymodal palaeocurrent pattern indicate that Upper Bhander sandstone sequence of the Tantpur area was deposited on a beach complex in a regressive shoreface environment.
On the Origin of Fusain in the Tertiary Coals of Meghalaya
Authors: Singh Mahendra P. 
Published: November 2024

Abstract
The fusain fragments separated from the Tertiary coals of Meghalaya were studied under a high performance Scanning Electron Microscope. The transverse view (across the bedding plane) of these charcoalified plant tissues shows the preservation of micro anatomical details together with complete absence of middle lamella leading to cell-walls homogenization. The homogenization of cell-walls suggests that fusain of these coals has originated due to the pyrolysis of woody tissues. Pyrolysis took place during the intermittent dry seasons by the generation of forest fires in the basin. Disappearance of middle lamella zone from the cell-wall points that charcoalification temperature was 400°C. Further, charring of wood at a high temperature is indicative of the high oxygen level during the development of coal facies.
Investigation of Idukki Earthquake Sequence of 7th-8th June 1988
Authors: Singh H. N. , Raghavan Venkatesh , Varma A. K. 
Published: November 2024

Abstract
The epicentres of Idukki earthquake sequence of 7th-8th June 1988 which was widely felt in southern peninsular India, has been investigated. They are confined to a small area around 9°48'40" N and 77°11'10"E. A maximum Intensity VI on the MM scale has been assigned in the epicentral region of the main shock. Magnitudes of 4.5, 4.1 and 3.4 have been estimated based on signal duration for the main shock and two significant aftershocks respectively. The studies carried out have indicated that the earthquake is associated with major lineaments. Possibility of earthquake being triggered by the Idukki reservoir is remote.
Singhbhum Copper Belt: Copper concentration in Plants
Authors: Shyam A. K. 
Published: November 2024

Abstract
The copper content in plant and soil has been evaluated. Among the different species, Holarrhena antidysenterica Wall., Hyptis sauveolens Poit and Rostellularia prostrata (Clarke) Mazumdar excel in their copper accumulating ability along the belt.
Marine Minerals in the Indian Ocean
Authors: Roonwal G. S. 
Published: November 2024

Abstract
It is apparent that while knowledge of distribution of marine mineral resources. in the Indian Ocean has increased substantially over the last decade, actual production is restricted to placer, precious stones and aggregates, as well as to salt and chemicals. from seawater. The anticipated development of deep-sea minerals such as manganese nodules has not taken place and is unlikely to do so in the forseable future. One reaSOD is the lack of information for the proper evaluation of marine minerals. There is considerable scope for the systematic survey of both the EEZ as well as the deeper parts of the ocean to make a realistic assessment of the mineral resources and the development of technology for their eventual recovery.
Study of Muscovite from Pelitic Schist of Doda Area, District Doda, Jammu and Kashmir, India
Authors: Gupta L. N. , Guha D. B. 
Published: November 2024

Abstract
Muscovites separated from pelitic schists of the Dada area show a limited range of composition between ideal muscovite and ferrimuscovite. The paragonite content in the muscovites ranges between 14 and 21 %. The tetrahedral Aliv increases with the increase in the grade of metamorphism though this increase is more for the muscovite of the aureole rock, i.e., in the andalusite to staurolite zone than in the kyanite-staurolite zone. Similar results are also shown by the (FeO+Fe2O3) and Na/(Na+K) with respect to AI2O3 and total Al respectively.
Oxygen Isotopic Composition of Archean Orthogneisses and Charnockites from Southern India
Authors: Condie Kent C. , Longstaffe F. J. 
Published: November 2024

Abstract
The oxygen isotopic composition of Archean orthogneisses and charnockites from Southern India is rather uniform (δ18O generally 6-8%) for metamorphic grades ranging from amphibolite to high-P granulite. Some high-P granulites have high δ18O~ 10%) suggesting sediment contributions. CO2 metamorphism does not appear to have affected the δ18O values of Indian charnockites.
Tectonic Phases and Crustal Evolution in a Part of the Eastern Chotanagpur Gneissic Complex
Authors: Baidya Tapan K. , Maity Nabakumar , Biswas Parimal 
Published: November 2024

Abstract
The area in and around Jabarban-Belamu (23°25' - 23°29'N, 86° - 86c05'E) of the Purulia district, West Bengal, bears evidences of polyphase deformation, metamorphism and magmatic activity in the eastern Chotanagpur complex. At least four phases of deformation are imprinted on the rocks since the sedimentation ( ∼ 2300 Ma) of the metasedimentaries up to the last phase of granitic activity (∼800 Ma). A regional north-south compression was responsible for the development of isoclinal or tight F1 and F2-foIds with nearly east-west axes and overturning towards south. Ultrametamorphism of the older sediments during the acme of F1-deformational phase formed the anatectic granitoids and migmatites. Younger plutonic granitoids were emplaced in the axial zones of the F2-folds. Nearly east-west compression during the third deformational phase caused north-south trending open type cross folds (F3). Pegmatites and hydrothermal veins were mostly synkinematically emplaced in the ENE-WSW trending shear zone developed during the fourth phase of deformation. These features serve to illustrate the evolution of the Chotanagpur Complex in the Eastern Indian Shield.
A New Technique for the Determination of Homogenization Temperatures of Fluid Inclusions
Authors: Kaul I. K. , Rao C. N. , Sanyal T. 
Published: November 2024

Abstract
A new technique to determine the homogenization temperatures of fluid inclusions is described. The technique is based on the principle of optical density and involves no ambiguity in recording homogenization temperatures unlike in the standard heating stage method where because of problems of visual clarity of liquid phase disappearance, accurate measurement of homogenization temperatures becomes difficult and unreliable. A comparison of the two methods shows that the present technique gives somewhat higher values than those based on heating stage method.