Kaladgi Basin Research Articles

Rock Art in the Aihole-Badami-kutakanakeri Series of the Malaprabha River Basin: Some Distinctive Features

The present author explored and studied 32 rock art sites, in Kaladgi basin, North Karnataka, among them 19 of which 67 localities are new discoveries in the Aihole-Badami-Kutakanakeri Series. This paper reviews of rock art of the series, a potential area of the Malaprabha river basin. The rock art includes both petroglyphs and pictograms in the form of cupules, geometrical lines, rhombus, human figures, historical paintings and many other motifs.

Modelling of high‐resolution aeromagnetic data to decipher structural deformation in parts of Kaladgi basin, Peninsular India

ABSTRACTWe show the effectiveness of forward and inversion modelling of high‐resolution magnetic data in deciphering the geological framework in a polydeformed Proterozoic Kaladgi basin. The Meso to Neo Proterozoic Kaladgi basin exposes platformal sediments in the northern margin of Dharwar Craton, Peninsular India. The study of high‐resolution magnetic data over Deshnur locality suggests two prominent trends NW–SE and NE–SW, followed by two minor trends of E–W and N–S. Analysis of the magnetic anomalies aided in understanding the succession of deformation events and their impact over sedimentation. The NW–SE trending Nalur shear zone marks the western contact between the Chitradurga Schist belt and Peninsular gneisses that are traced beneath the Badami sediments. The forward model suggests that the NE–SW trending block faulting resulted in generating a series of Horst and Graben structures. Three‐dimensional compact inversion of circular features bearing remanent magnetisation indicates elliptical‐shaped pipe‐like bodies. The three‐dimensional inversion of magnetic data implied thicker sediments within these Graben structures. The basement configuration depicted as elevation of magnetic basement corroborates these three‐dimensional inversion results. The derived results are validated by drill holes, and the intercepts substantiate the inferred structural setup over the study area. Available drill hole and magnetic data interpretation are combined with field information to reconstruct the tectonostratigraphy and the architecture of the Kaladgi basin around Deshnur locality.

Mapping subtrappean sediments and delineating structure with the aid of heliborne time domain electromagnetics: Case study from Kaladgi Basin, Karnataka

Mapping of subtrappean sediments is a complex geological problem attempted by many interpreters applying different geophysical techniques. Variations in thickness and resistivity of traps and underlying sediments, respectively, results in considerable uncertainty in the interpretation of geophysical data. It is proposed that the transient electromagnetic technique is an effective geophysical tool for delineation of the sub-trappean sediments, due to marked resistivity contrast between the Deccan trap, and underlying sediments and/or basement. The northern margin of the Kaladgi basin is covered under trap.A heliborne time domain electromagnetic survey was conducted to demarcate the basin extent and map the sub-trappean sediments.Conductivity depth transformations were used to map the interface between conductive trap and resistive ‘basement’. Two resistivity contrast boundaries are picked: the first corresponds to the bottom of the shallow conductive unit interpreted as the base of the Deccan Volcanics and the second - picked at the base of a deeper subsurface conductive zone – is interpreted as the weathered paleo-surface of the crystalline basement.This second boundary can only be seen in areas where the volcanics are thin or absent, suggesting that the volcanics are masking the EM signal preventing deeper penetration. An interesting feature, which shows prominently in the EM data but less clearly imaged in the magnetic data, is observed in the vicinity of Mudhol. The surface geology interpreted from satellite imagery show Deccan trap cover around Mudhol. Modelling of TDEM data suggest the presence of synclinal basin structure. The depth of penetration of the heliborne TDEM data is estimated to be approximately 350m for the study area. This suggests that heliborne TDEM could penetrate significant thicknesses of conductive Deccan trap cover to delineate structure below in the Bagalkot Group.

Basement–cover structural relationships in the Kaladgi Basin, southwestern India: Indications towards a Mesoproterozoic gravity gliding of the cover along a detached unconformity

Structural relations between the Archaean basement and overlying Mesoproterozoic sedimentary cover were examined in the Kaladgi Basin of south western India. The basement, that forms a part of the western Dharwar craton, is an assemblage of the Archaean Peninsular Gneissic Complex (PGC), late Archaean Hungund Schist Belt (HSB) and granites (Closepet granite). The HSB, composed of Banded Iron Formations, quartzites, metapelites and mafic metavolcanics have undergone multistage deformation (D1, D2, and D3 respectively) with the development of refolded plane-non-cylindrical folds, transposed compositional banding and schistosity, crenulation lineations − all of which developed during the D1–D2 stage. These were mildly cross-folded along NE–SW during the D3 stage with an overall orientation of the structural grain along the NW–SE (310°) direction. The PGC consisting of granitoid gneisses are deformed in phase with the HSB. The Closepet granite that is intrusive within the PGC and the HSB is relatively younger (c. 2.5Ga) and is massive and undeformed, in general.Based on type, geometry, distribution, association of structural elements, variation and relative chronology of development, the deformation structures of the Mesoproterozoic sedimentary cover rocks of the basin can be grouped to define an extensional domain in the northern sectors and a contractional domain in the south–central sectors of the basin. The extensional domain is characterized by development of a gently dipping (10°−15° due south) homocline that is affected at places by normal faults, tensile and hybrid joints, and contain torn – apart segments of the cover. In the south–central sectors of the basin, an association of WNW–ESE trending, both northerly and southerly verging, asymmetric-to-overturned, plane non-cylindrical, gently plunging folds with axial planar cleavages, E–W trending thrusts, and N–S trending strike-slip faults, together define the contractional domain. Distribution, variation and interrelationship of structural elements in the cover rocks, reveal that, the extensional and contractional domains, are spatially linked, laterally pass on to each other continuously and are related to a single deformation event of the cover.The contrasting structural anatomy of the basement vis-a-vis Mesoproterozoic sedimentary cover indicate that (1) the Mesoproterozoic cover of the Kaladgi Basin, during its deformation, became detached from the basement and the basement thereby remained unaffected during deformation of the cover and (2) the deformation of the Mesoproterozoic sedimentary cover originated by a southerly-directed gravity gliding of the cover over the basement along the basement–cover contact (unconformity) that served as a surface for detachment.The Mesoproterozoic gravity gliding event in the Kaladgi Basin is inferred to result from a tectonic uplift of the basement in the northern sectors, due to possible crustal flexure of the South Indian Block during terminal phases of amalgamation of North Indian Block and East Antarctica with the South Indian Block during the Grenvillian.

Analysis of Folding in the Proterozoic Sedimentary Sequence of Bagalkot Group Exposed around Yadwad, N Karnataka, India: a Study Based on Remote Sensing Techniques and Field Investigations

The deformed sedimentary sequence exposed in the core of Precambrian Kaladgi Basin, North Karnataka India, has given rise to prominent regional basinal structures with intervening anticlines. Deformation ceases away from the core part. The basinal structures are recognised on satellite images, aerial photographs and toposheets because of resistant segmented ridges of quartzite. A closure view of Bhuvan images around Yadwad village, North Karnataka, the core portion of Kaladgi Basin also revealed presence of folded geometry in the older carbonates of Bagalkot Group seen along the margins of the regional folds. Though folding in the sequence exposed in the region around Yadwad and further west is described by many authors, no detailed analysis of structures is available in published literature. An attempt is made here to map, analyse and integrate the structures in carbonates of Yadwad region on different scales observed in the field to find out their possible origin. It is suggested that the structures are syntectonic in origin formed in the presence of circulating fluids in high pressure and low temperature during the post depositional phase the Bagalkot sequence in which gravity played an important role in the formation of regional structures. The sequence also has recorded low grade of metamorphism as seen from the thin section observations.

Chapter 1 Precambrian basins of India: stratigraphic and tectonic context

The Indian shield represents a vast repository of the Precambrian geological record. The Precambrian sedimentary basins were developed on four major Archaean nuclei (Dharwar, Bastar, Singhbhum and Aravalli–Bundelkhand; Fig. 1.1) and are comparable to those of Australia, South Africa, Canada and Brazil in scale and importance for global studies of Precambrian crustal evolution. Some of the Indian basinal successions, as elsewhere, contain valuable economic resources. Notwithstanding their global relevance, many aspects of the Indian Precambrian basins and even entire basins are not well known to international readers. Although specialist papers, a book (Naqvi & Rogers 1987) and special publications (e.g. Mazumder & Saha 2012) have been written by several authors on specific aspects of the Precambrian geology of India, a comprehensive account of the time–space distribution of the Precambrian supracrustal successions is lacking; in particular, the interrelation between tectonics and sedimentation, and the similarities and dissimilarities of their evolutionary histories with other comparable successions in other parts of the world are yet to be addressed in any detail. The purpose of the present memoir is to fill in this knowledge gap. In addition, the memoir will assess the potential mineral resources of Indian Proterozoic basins and integrate piecemeal information to provide a comprehensive picture of Indian cratonic evolution during the Precambrian. Fig. 1.1. Sketch map showing four Archaean nuclei in India. Note Proterozoic sedimentary basins (dark grey patches) and the large Deccan basaltic province. SGT, Southern Granulite Terrain; NFB, Nallamalai fold belt; CITZ, Central Indian Tectonic Zone; PG, Pranhita Godavari Valley; Ab, Abujhmar Basin; Am, Ampani Basin; Bh, Bhima Basin; Ch, Chattisgarh Basin; Idv, Indravati Basin; Kal, Kaladgi Basin; Suk, Sukma Basin; Ban, Bangalore; Cd, Cuddapah; Hyd, Hyderabad; K, Kurnool; Kh, Khariar; Nel, Nellore; Ong, Ongole; Vij, Vijaywada (after Saha & Mazumder 2012). The content of the memoir has been divided …

Locating New Uranium Occurrence by Integrated Weighted Analysis in Kaladgi Basin, Karnataka

Interpretation of airborne geophysical data especially gamma ray spectrometric data is important for mineral exploration, specifically radioactive elements and to identify uranium targets. Exploration was carried out in MesoNeoproterozoic Kaladgi basin for five decades to target different types of uranium mineralisation. The first sizable sub-surface uranium mineralisation was intercepted at Deshnur within Badami arenites close to unconformity contact along the southern margin of the basin (Shobhita et al., 2011). Heliborne geophysical surveys were carried out in western part of the basin from Kadgaon to Ramdurg to acquire Time Domain Electromagnetic, Magnetic and Radiometric data. The radiometric data was collected using Exploranium GR820 airborne (256-channel recording) spectrometer system mounted in a helicopter with four 4.2L downward looking crystals and one 4.2L upward looking crystal for a total effective volume of 16.8L downwards and 4.2L upwards. The raw radiometric data was processed for corrections (background, radon, stripping, height attenuation etc) and counts were converted to ground concentration of %K, eU ppm, and eTh ppm, and their grid maps were prepared (Sridhar et al, 2012) . Kaladgi basin is an irregular E-W trending area in the northern part of Dharwar craton. In the study area, Kaladgi basin sediments are exposed as unconformably overlying the basement crystallines in the south and are covered by Deccan traps in the north. The crystalline basement of the Kaladgi Supergroup is represented by NNW trending Meso to Neoarchaean peninsular gneiss, greenstone belts and Closepet granite. The sedimentary sequence in the Kaladgi Supergroup has been divided along an angular unconformity surface into two groups: the lower Bagalkot Group, and the overlying Badami Group. The sediments of Bagalkot Group comprises of arenaceous, argillaceous and carbonate sequences which are folded into a series of anticlines and synclines. The sediments of Badami Group are undeformed and rest unconformably over the Archaean basement rocks as well as the Bagalkot Group. The Badami Group comprises of horizontal to gently dipping beds of arenite, shale and limestones (Jayaprakash et al., 1987). This study aims at identifying uranium potential zones by integrated analysis of thematic layer interpreted and derived from airborne radiometric and magnetic data, satellite data along with available ground geochemical data in western part of Kaladgi basin. Integrated weighted analysis of spatial datasets which included airborne radiometric data (eU, eTh & % K conc.), litho-structural map, hydrogeochemical U conc., and geomorphological data pertaining to study area, was attempted. The weightage analysis was done in GIS environment where different spatial dataset were brought on to a single platform and were analyzed by integration (Fig.1). The processed radiometric database was taken up for quantitative analysis to identify radiometric uranium anomalies. The database was clipped by using exposed and inferred lithological contacts of Badami Group to separate out data over sediments of Badami Group only. The analysis was carried out in two methods - 1 st the whole block and 2 nd Badami Group exclusive. Statistical analysis was applied to the airborne spectrometric data for separation of uranium anomalies from background. The statistics of the databases for uranium, thorium, ratio of uranium to thorium and uranium squared by thorium were calculated. The anomalies were extracted by applying cutoff threshold values for uranium, uranium by thorium and uranium squared by thorium channels in both methods. These anomalies were plotted spatially and they were classified as cluster anomalies and point anomalies depending upon their nature. Weightages were assigned based on nature of anomalies and cluster anomalies were given more weightage as they are more significant compared to point anomalies. The anomalies extracted from the

Stromatolites of the Kaladgi Basin, Karnataka, India: Systematics, biostratigraphy and age implications

Systematics of the stromatolites of the Proterozoic Kaladgi Basin is attempted. The main purpose is to document the diversity and distribution of the various stromatolite forms occurring in the Bagalkot Group of the Kaladgi Supergroup. An assemblage of six taxa is recognized from the Bagalkot Group. The forms Asperia digitata (=Yelma digitata), Ephyaltes edingunnensis, Eucapsiphora leakensis, Kussoidella karalundiensis, Pilbaria deverella and Yandilla meekatharrensis are described. These forms are not recorded from any other Proterozoic Sequence of India of the Palaeoproterozoic age. Similar forms are recorded from Africa, Australia, Canada and China. Asperia digitata, a digitate stromatolite, is known from the Proterozoic Sequence of the Palaeoproterozoic age in other parts of the world. Poorly constrained age of the Bagalkot Group of the Kaladgi Supergroup can be ascertained on the basis of the reported assemblage as Late Palaeoproterozoic to Early Mesoproterozoic (Orosirian-Statherian to Calymmian Period).

Geological Interpretation of Heliborne Geophysical Data from the Kaladgi Basin; Southern India

Geological interpretation from the Kaladgi Basin is based on integration of heliborne time domain electromagnetic (HELITEM), magnetic and gamma-ray spectrometry data with available geological mapping, ground exploration data, various published papers and spectral remote sensing data such as Landsat 7ETM+ and ASTER GDEM imagery. Electromagnetic (EM) data, magnetic, radiometric, Landsat TM and Aster datasets were used for delineation of surface and subsurface extent of geological units and structural elements and for better understanding of the overall structural pattern of the Kaladgi Basin, including distribution of its local depocentres, the resistive basement surface and the magnetic basement topography. The interpretation of the available data details the localisation of intrusive bodies, basaltic lava flows, mafic dykes, basement faults and major intrabasinal fault systems. Three dimensional grids (voxel models) of EM data were used for visualization in three dimensions.

A reinterpretation of two chertbreccias from the Proterozoic basins of India

Several horizons of a unique lithotype called “chertbreccia” are interbedded within the Proterozoic platform sediments of the Peninsular India. These cherty rocks with brecciated texture appearing as blocky masses were earlier diversely interpreted as being products of disparate processes such as fault-zone breccias, collapse breccias, and so on. Two of these horizons, one from the Kaladgi Basin (Dharwar Craton) and the other from the Dhar Forest Inlier of the Vindhyanchal Basin (Bundelkhand — Aravalli Craton) are compared in context of their geological setting, field relations and petrological constitution. A model of the mode of development of these peculiar rocks is reconstructed, taking into account their characters and limitations of previous interpretations. They are interpreted as transported debris deposits of syntectonogenic material released during the episodic activity of the growth faults of the Kaladgi and Vindhyanchal Basins that was diagenetically silicified.

Seismites in the Lokapur Subgroup of the Proterozoic Kaladgi Basin, South India: A testimony to syn-sedimentary tectonism

Syn-sedimentary deformation structures (SSDs) can indicate disturbance caused by autogenic or allogenic processes affecting the depositional system. Such structures are prolific in the Proterozoic shallow marine sediments of Kaladgi Basin, especially in the basal part of the succession (Lokapur Subgroup), in both clastics and carbonates. Widespread distribution, lateral traceability of the deformed horizons across several hundreds of meters, their occurrence between undeformed beds and proximity to NW–SE to E–W trending faults and shears are used to attribute a seismic origin to some of these SSDs . Release of accumulated stresses in the basin floor undergoing extension caused the episodic seismic activity producing the seismites. These “seismites” record the syn-sedimentary tectonism that controlled facies distribution patterns in the Mesoproterozoic Bagalkot Group in conjunction with sea-level fluctuations. On one hand, this is a contribution towards recognition of seismic events during the Mesoproterozoic, a period from which few seismites have been recorded. On the other hand, recognizing that the crustal processes that operated in brittle regimes during the creation of this extensional supracrustal basin around 1800 Ma were comparable to those operating in present day extensional systems opens a window of understanding how the Proterozoic platform basins hosting thick shallow marine sequences evolved.

Near surface manifestation of hydrocarbons in Proterozoic Bhima and Kaladgi Basins: Implications to hydrocarbon resource potential

Reconnaissance surface geochemical survey for adsorbed soil gas analysis conducted in Proterozoic Bhima and Kaladgi Basins, have revealed occurrence of anomalous concentrations of light gaseous hydrocarbons i.e. C1 to C4 (CH4, C2H6, C3H8, i-C4H10 and n-C4H10) in the near surface soils. The concentrations of C1 and ΣC2+(C2H6+C3H8+ i-C4H10+ n-C4H10) in Bhima and Kaladgi Basins are in the range of 1–2594 ppb and 1 to 57 ppb and 1–1142 ppb and 1–490 ppb, respectively. The carbon isotopic data of adsorbed soil gas methane in few selected samples are in the range of −29.9 to −39‰ (PDB). The evaluation of adsorbed soil gas data indicates that all the gas components are cogenetic and hydrocarbon ratios of C1/(C2+C3) < 10 and C3/C1*1000 between 60–500 and 20–60 suggest that the adsorbed gases are derived from oil and gas-condensate zones. The carbon isotopic values of methane further support thermogenic origin of these migrated gases. The concentration distribution of C1 and ΣC2+ in the study areas illustrate C1 and ΣC2+ anomalies near Katamadevarhalli, Andola and Talikota in Bhima Basin and near Kaladgi, Lokapur and north of Mudhol in Kaladgi Basin. The hydrocarbon anomalies near the surface coincide with the favourable subsurface structural features and correlate with existing geochemical and geophysical data in these basins suggesting seepage related anomalies.

The nature of the Archean upper crust as revealed by the geochemistry of the Proterozoic shales of the Kaladgi basin, Karnataka, southern India

Major, trace and rare earth element geochemical studies of the shales belonging to the ∼1.8 Ga Proterozoic Kaladgi Supergroup of southern India shows that they are derived from strongly chemically weathered Archean upper crust. This has resulted in depletion of Na 2O, CaO, Sr and U in these shales. The shales of lower stratigraphic intervals are enriched in MgO, Fe 2O 3, Cr, Ni, Co and Sc relative to the upper shales. The upper shales, by contrast, show enrichment in elements such as Ba, Th and Zr. These characteristics and the barium–cobalt ratios show that the early sediments were derived from a more mafic provenance and the contribution of granitoids increased towards the later stages of Kaladgi sedimentation. Rare earth element (REE) modelling shows that the average Kaladgi shale represents a contribution from a crust with a mafic to felsic rock ratio of 60:40. The post-depositional introduction of potassium and LREE in these shales has been inferred based on the overall geochemical characteristics.

The Neoproterozoic Cratonic Successions of Peninsular India

The Peninsular India hosts extensive record of Mesoproterozoic, and Neoproterozoic successions in several mobile belts, and cratonic basins. The successions provide excellent opportunities for chronostratigraphic classification, in tune with the chronometric classification adopted by IUGS for inter-regional correlation on a global scale. Major tectono-thermal events at 1000–950 Ma in the mobile belts, correlatable with the Grenville orogeny may be considered as the datum for Meso-Neoproterozoic classification in India. Principles of chronostratigraphic classification, however, can not be applied yet to the cratonic successions of India because of inadequate radiometric data, paucity of biostratigraphic studies, and lack of regionally correlatable stratigraphic or palaeoclimatic datum. The kimberlite magmatism which affected the Peninsular India on a continental scale at about 1100 Ma, holds the key to the identification of Neoproterozoic successions of the cratonic basins. Thus, the stratigraphically confined diamond-bearing conglomerates and/or the tuffs associated with kimberlites, may be considered as the datum to define the base of the Neoproterozoic, fixed at about 1000 Ma. Accordingly, the Rewa, and Bhander Groups in the Vindhyan basin, the Kurnool Group in the Cuddapah basin, the Jagdalpur Formation in the Indravati basin, and the Sullavai Group in the Pranhita-Godavari basin are taken to represent the Neoproterozoic successions in the Peninsular India. The Chattisgarh Group in the central India, the lower part of the Marwar Supergroup in western Rajasthan, the Badami Group in the Kaladgi basin, and the Bhima Group are the other “possible Neoproterozoics” in the Peninsula. The closing phase of the Mesoproterozoic in all these basins are characterised by stable shelf lithologic associations attesting to high crustal stability. The Neoproterozoic basins, by contrast, mark a new phase of rifting, and extension, and the basin fills exhibit signatures of initial instability which evolved with time into a more stable platformal condition. A major episode of sea level rise has been recorded in most of the basins. The riftogenic origin, and evolution of the basins are comparable with the history of Neoproterozoic basins of Australia though there is no unequivocal record of glaciation in the Indian formations.

Occurrence of a Manganese-Bearing Horizon in the Kaladgi Basin

Abstract A manganiferous horizon was recorded near Niralkeri, in an intricately folded quartzite-chert breccia-mudstone sequence of the Simikeri Subgroup in the Kaladgi Basin of Karnataka. The nodules collected from this horizon show the presence of todorokite, vemadite and lithophorite in association with quartz and hematite; with MnO-58%.

Testimony of Intraformational Limestone Breccias on Lokapur-Simikeri Disconformity, Kaladgi Basin

Abstract Detailed measurements of a more than 55 m wide tract of the Chikshellikeri Limestone, immediately underlying the Muchkundi Quartzite were undertaken in the Kaladgi Basin. This sequence is constituted of 3218 measured laminations from more than 1550 mudstone - packstone couplet. They are interrupted by 57 horizons of Intraformational Limestone Breccias. The distribution pattern of these horizons within the sequence is evaluated within the framework of the depositional environments which yielded the limestone sequence and they are recognised as products of events of penecontemporaneous basin-floor instability. It is shown that disconformity separating the Bagalkot Group into two Subgroups (earlier attributed to two separate transgresive events) was formed as a result of reorganisation of the basin configuration in response to synsedimentary tectonics and not as a result of a second transgression of the contemporary sea.

Man-land relationships during Palaeolithic times in the Kaladgi Basin, Karnataka

Man-land relationships during Palaeolithic times in the Kaladgi Basin, Karnataka

Man-land relationships during palaeolithic times in the kaladgi basin, karnataka. Raghunath S. Pappu and Sushama G. Deo, 1994, Deccan College Post-Graduate and Research Institute, Pune, India, 92 pp., $10 plus sea mail shipping (paperbound).

Man-land relationships during palaeolithic times in the kaladgi basin, karnataka. Raghunath S. Pappu and Sushama G. Deo, 1994, Deccan College Post-Graduate and Research Institute, Pune, India, 92 pp., $10 plus sea mail shipping (paperbound).

Macrofacies Architecture of the First Transgressive Suite Along the Southern Margin of the Kaladgi Basin

Abstract The lowest sequence of the Lokapur Subgroup from the Bagalkot Group manifests the earliest transgression in the Meso-Neoproterozoic Kaladgi Basin. It is characterised by four sedimentary lithofacies namely, (i) sandstone facies (dominantly quartzose-arenites with minor interbedded conglomerates and gravel beds), (ii) argillite facies (including siltstones and shales), (iii) carbonate facies (primarily dolomites which are often cherty and stromatolitic) and, (iv) chertbreccia facies (poorly bedded and silicified). These four macrofacies have been studied in the gently folded and faulted exposures along the southern margin of the Kaladgi Basin. An unfolded fence of their distribution and mutual dispositions is reconstructed so as to enable the visualization of their syndepositional architecture. Modifications of the existing classification of the examined sequence of the Lokapur Subgroup are suggested on the basis of this restoration and in context of process responsive lithostratigraphy. The Kaladgi Basin is interpreted to have been initiated in an extensional tectonic regime. All the four recognised macrofacies were deposited more or less simultaneously during the earliest transgression in this basin and their architecture was governed by synsedimentary events of sagging of the uneven basin floor along an array of East-West trending growth faults with northern downthrows.

Geology of the area around Badami, Bijapur District, Karnataka state—A study based on interpretation of remotely sensed data

Geological studies in the area around Badami, Bijapur District, Karnataka, were carried out with the help of Landsat imagery and aerial photographs. The study are forms a part Kaladgi Basin which is located on the northernmost fringes of the exposed Dharwar Craton. Archaen Peninsular Gneiss and intrusive Granodiorite/Granites (≈Clospet Granite) form the basement for the Middle to Late Proterozoic Kaladgi Super Group sediments which are, in turn, overlain in the north by the Upper Cretaceous to Lower Eocene Deccan flood basalt lavas. Geological mapping of the study area and inferences about the structural setup were primarily based on interpretation of the remotely sensed data. The combined interpretative study of Landsat imagery and aerial photographs was instrumental in mapping of the lithostratigraphic units exposed in the study area along with the structures associated with them.