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Detailed field and petrological studies in Vanambayi-Lingala-Lopatnutala section and old Kadiri Ghat-Pulivendela section in SW part of the Proterozoic Cuddapah basin of Eastern Dharwar craton brought to light the occurrence of hitherto unreported two significant phases of pyroclastic volcanic activity associated with the Vempalle Formation …

The remaining kimberlites (e.g., TK-2, TK-3 and the TK-1 microcrystic variant), are more similar to other 1100 Ma, Group I-type kimberlites of the Eastern Dharwar Craton, as well as the typical ...

The late Archaean Shimoga schist belt in the Western Dharwar Craton, with its huge dimensions and varied lithological associations of different age groups, is an ideal terrane to study Archean crustal evolution. The rock types in this belt are divided into Bababudhan Group and Chitradurga Group. The Bababudhan Group is dominated by …

Here, we review geological, geophysical and geochronological data (mainly zircon U-Pb age–Hf isotope compositions) from the Dharwar craton representing over a billion year-long geologic history ...

Granite-hosted Cu-Au Mineralization in the Machanur Deposit, Eastern Dharwar Craton. Abhishek Kumar Shukla 1, S. Dsilva Danira 1 & M. N. Praveen 1 …

Dharwar craton (DC), by far the largest geological domain in South Indian Shield, occupying about 0.5 million sq. km area, is well-studied terrain both for regional geoscientific aspects and as part of mineral exploration over several important blocks such as the greenstone belts, ultramafic complexes, granite-gneissic terrain and the …

The exposed granite gneissic complex to the west of Cuddapah basin in Eastern Dharwar Craton (EDC) is studied to understand the magnetic character of various plutons in this region with more ...

Whole-rock Sm-Nd isochron ages are reported for two stratiform meta-anorthosite complexes emplaced into the Archean supracrustal-gneiss association in the amphibolite facies terrain around Holenarsipur, in the Dharwar craton, South India. While these metaperidotite-pyroxenite-gabbro-anorthosite complexes are petrologically and …

In spite of detailed geological investigations of the Dharwar craton since the 1890s, its principal lithological units, structure and chronology remain contentious. Important new work on lithostratigraphy, basin development, structure, geochemistry and geochronology has led to wide-ranging speculation on the Late Archaean plate tectonic setting. Much of the …

Our velocity model shows 150-200 km thick lithosphere in most of the Archean Dharwar craton where Vsv is >4.7 km/s in the depth of 50-100 km and progressively decreases to 4.6 km/s at 120-150 km ...

The CSIR-NGRI introduced the magnetotelluric (MT) method into its scientific programmes during late 1970s for crustal electrical imaging. The mapping of a major subtrappean sedimentary basin in the northwestern Saurashtra is the first major accomplishment of CSIR-NGRI in the field of MT studies which provided a solution to a …

The eastern margin of the Chitradurga Schist Belt is widely believed as the dividing line of Dharwar Craton (DC) into Western Dharwar Craton (WDC) and Eastern Dharwar Craton (EDC). This study aims at re-defining the division of DC based on pronounced gravity high encompassing Chitradurga Schist Belt of WDC and Closepet …

The Dharwar Craton in the southern part of the Indian shield comprises two distinct blocks viz. the Meso-Neoarchean western and the predominantly Neoarchean eastern blocks, which are popularly referred to as Western Dharwar Craton (WDC) and Eastern Dharwar Craton (EDC). ... (z), K i and A i are temperature, thermal Cuddapah Basin, which is in ...

PDF | The Neoarchaean Era is characterized by large preserved record of continental crust formation. Yet the actual mechanism (s) of Neoarchaean crustal... | …

Yet the actual mechanism (s) of Neoarchaean crustal growth remains controversial. In the northwestern part of the eastern Dharwar craton (EDC) granitoid …

Geology and geochemistry of archaean felsic metavolcanic rocks of the Eastern Part of the Kolar greenstone belt, Dharwar craton, India: Implications for their …

In the northwestern part of the eastern Dharwar craton (EDC) granitoid magmatism started at 2.68 Ga with gneissic granodiorites showing intermediate …

Magnetotelluric-derived two-dimensional lithospheric resistivity structure of the western Dharwar craton (WDC) and adjoining Coorg block indicates isolated low-resistivity zones in the crust and three striking upper mantle conductive features within the highly resistive Archean lithosphere. The crustal conductors in the WDC show good …

Dharwar craton (WDC) a nd Eastern Dharwar craton (EDC), on th e basis of diffe rences in age, lithologic al v ariatio ns, structural fea- tures, the abund ance of greenstones, differen ces in volcano-

It may be simplified in the following two (opposite) limits. (i) Fraunhofer diffraction takes place when z / a > > a / λ – the relation which may be rewritten either as a < < (zλ)1 / 2, or as ka2 < < z. In this limit, the ratio kx, 2 / z is negligibly small for all values of x′ under the integral, and we can approximate it as.

The Neoarchaean Dharwar Supergroup of rocks in the Chitradurga area unconformably overlie the Mesoarchaean Peninsular Gneissic Complex in the west and are tectonically juxtaposed with Javagondanahalli Schist Belt in the east. The rocks of the supergroup have been divided into older Bababudan and younger Chitradurga Groups. …

ELSEVIER Precambrian Research 80 (1996) 205-216 Pre n'r (nn h Sm-Nd ages of Archaean metavolcanics of the Dharwar craton, South India Anil Kumar*, Y.J. Bhaskar Rao, T.V. Sivaraman, K. Gopalan National Geophysical Research Institute, Uppal Road, Hyderabad, 500007, India Received 12 June 1995; accepted 26 February 1996 …

Yet the actual mechanism(s) of Neoarchaean crustal growth remains controversial. In the northwestern part of the eastern Dharwar craton (EDC) granitoid magmatism started at 2.68 Ga with gneissic granodiorites showing intermediate character between sanukitoid and tonalite–trondhjemite–granodiorite (TTG).

Definition. The Dharwar craton is a part of southern India, underlain by Archean rocks, and extending roughly between the cities of Goa, Hyderabad, Chennai, …

The presence of recycled crust in the lithospheric mantle of the Dharwar craton has been investigated using trace element geochemistry of olivine grains from an …

The area adjoining the western part of Archaean Nellore schist belt and the eastern margin of the Proterozoic Cuddapah basin in south Peninsular India is marked by emplacement of a number of granite plutons of Proterozoic age, intermittently extending over a stretch of 350 km from Vinukonda in the north to Sri Kalahasti in the south. …

Geochemical and zircon U–Pb age data on granites of the Chitrial area, situated at the NE part of the Eastern Dharwar Craton, are presented to elucidate their petrogenesis, time(s) of emplacement, and role in crust formation. Based on field and geochemical characters, these granites are classified as alkali feldspar/monzo-granite.

The Indian shield is an amalgamation of smaller cratons formed by geodynamic process from Mesoarchean to Neoproterozoic (Taylor et al. 1984).The southern part of the shield is largely occupied by Dharwar craton (Fig. 1).On the surface, craton is divided into the Western Dharwar Craton (WDC) and Eastern Dharwar Craton (EDC), …

The Archean eastern Dharwar craton is transacted by at least four major Proterozoic mafic dyke swarms. We present geochemical data for the ~2.21–2.22 Ga N-S to NNW-SSE trending Kunigal mafic ...