Cratons whose ancient rocks are widely exposed at the surface, often with relatively subdued relief, are known as shields. Close to the southern boundary of eastern dharwar craton, kolar greenstone belt extends for about 80 km length in n. A 2082 ma radiating dyke swarm in the eastern dharwar craton. A number of kimberlites and lamproites were emplaced during the proterozoic in the eastern dharwar craton and cuddapah basin of the southern indian shield. Abstractmineralogy and bulkrock geochemistry including sr and nd isotopes of two ultramafic pyroxenite intrusions at gurramkonda, situated adjacent to the southwestern margin of the paleomesoproterozoic cuddapah basin within the eastern dharwar craton, southern india, are presented. They have diverse volcanic plume and arc associations. The dharwar craton comprises western wdc and eastern edc subdivisions possibly separated by the closepet granite, predicated on lithological contrasts and inferred metamorphic and magmatic evolution. The dharwar craton dc exposes a large section of archean continental crust fig. The craton is divisible into a dominantly paleomesoarchean western dharwar craton wdc and a largely neoarchean eastern dharwar craton edc based on age and metamorphic criteria rollinson et al. C manikyamba, r kerrich, tarun c khanna, and, d v subba rao. Arcrelated pyroxenites derived from a longlived neoarchean. Eastern margin of western dharwar craton is rather more uncertain, although, according to naqvi and rogers 1967 closepet granite can be considered as a boundary between these two blocks.
Pb ages for zircon and titanite from the ramagiri area, southern india. A sanukitoidlike granitoid is exposed along the eastern margin of the belt which is enriched in lile as well as ferromagnesian elements. A postulated genesis of the wdc comprises early, c. The dharwar craton is divided into western wdc and eastern edc parts separated possibly by the closepet granite batholith, based on lithological differences and inferred metamorphic and magmatic genetic events. The wdc and edc are separated by the chitradurga shear zone that is situated at the eastern margin of the chitradurga.
In summary, the eastern dharwar craton preserves records of multistage crustal growth and reworking events. Neoarchean greenstone metamorphism in the eastern dharwar. Deep crustal electrical signatures of eastern dharwar craton, india article pdf available in gondwana research 74. The pyroxenites have a characteristic cumulate texture, with a predominance of. Pdf petrology, mineral chemistry and geochemistry of the. Lithosphereasthenosphere interaction and carbonatite. The craton is divided into two tectonic blocks after swaminath et al. Pdf greenstone belts of the eastern dharwar craton, india are reinterpreted as composite tectonostratigraphic terranes of accreted plumederived and. Giritharan and rajamani, 19987 and ramagiri meenal mishra and rajamani, 19998. Metamorphic evolution of the karimnagar granulite terrane.
Subductioncollision processes and crustal growth in. They were assembled in a subductionaccretion orogen. Neoarchaean magmatism through arc and lithosphere melting. Evidence from eastern dharwar craton wiley online library. Geology of the western dharwar craton iosr journal. Neoproterozoic extension in the greater dharwar craton. However, the nature of crustal growth including the mechanism and tectonic setting of the neoarchaean are controversial issues. Formation and the growth of different rock suites of dc appear to have. Department of earth sciences, university of roorkee, roorkee 247667, india. The kimberlites that intruded the lower section of the nallamalai group. Multistage crustal growth and neoarchean geodynamics in. Constraints from monazite uthpb total ages and pt pseudosection calculations. If the ancient rocks are largely overlain by a cover of younger rocks then the hidden craton may be. Petrological characteristics of the peddavura schist belt.
The remaining boundary to the north is buried under younger sediments and the cretaceous deccan traps figure 2. Age and basin evolution of the cuddapah supergroup 9 a period of potassic magmatism produced kimberlite dykes which intruded the dharwar craton and the nallamalai group of the cuddapah basin chalapathi rao et al. Recent advancements in dharwar geology and tectonics. These are predominantly microcline and quartz with. Geochemistry of adakites and rhyolites from the neoarchaean gadwal greenstone belt, eastern dharwar craton, india. Dharwar craton is divided into western block and eastern block swaminath et al. They occur as two clusters, in the anantapur and mahbubnagar districts of. Read your article online and download the pdf from your email or your account. Preliminary fluid inclusion study from chigargunta gold.
Neoarchean greenstone metamorphism in the eastern dharwar craton, india. They were assembled in a subductionaccretion orogen as migrating arcs captured thick plumeplateaus. Globally, 2700 ma zircon age peaks have been attributed to high rates of continental growth as a result of craton collisions condie et al. Age and basin evolution of the cuddapah supergroup, india. Seismic imaging of crust beneath the dharwar craton, india. Characterization of granitoids adjoining southern part of. Dec 11, 2017 conclusion dharwar craton is a classical greenstonegranite terrain, divided into western and eastern dharwar craton. One of them is the chigargunta deposit in the south kolar greenstone belt. Multistage crustal growth and neoarchean geodynamics in the.
However, such zircon age peaks have not been documented in the dharwar craton. Petrological characteristics of the peddavura schist belt and. The geology and basin evolutionary history of the dharwar craton is discussed. New data on the mineralogy of chromite from the nuggihalli. Dharwar craton is bounded by the eastern ghats mobile belt in the east, east. Dharwar craton introduction and its extension classification difference between wdc and edc western dharwar craton eastern dharwar craton lithology dharwar supracrustal rocks sargur group bababudan group chitradurga group greenstone belts younger granites closepet. Petrogenesis of proterozoic lamproites and kimberlites. The karimnagar granulite terrane is an integral part of the eastern dharwar craton edc, india, having been the subject of much interest because of the only reported granulite facies rocks in the edc. Introduction the dharwar craton, which forms a part of the precambrian shield of india, records more than a billion years of the early history of the earth, involving several episodes of crustal growth. Pdf seismic anisotropy beneath the eastern dharwar craton. Evidence for accretionary origin of the eastern dharwar craton during the late archean. Read a crustal section of eastern dharwar cratongodavari rifteastern ghats mobile belt, india, gondwana research on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Ree geochemistry of auriferous zones from eastern dharwar craton 145 figure 1.
The division between the western and eastern dharwar cratons. The granite batholiths of eastern dharwar craton, which are showing intrusive relationship with ttgs, exposed in the eastern part of telangana state at university of hyderabad, gachibowli 9. Regional geology the dharwar protocontinent is subdivided into three distinct cratonic blocks. Extended abstract 1 9th international kimberlite conference extended abstract no. Evolution of the cuddapah supergroup, india julie mackintosh a1161956 october 2010. Subduction related tectonic evolution of the neoarchean eastern. The term dharwar supergroup is now used as synonymous with metamorphosed precambrian sediments and including all the schistose series below the eparchaean unconformity. Dec 20, 2019 the granite batholiths of eastern dharwar craton, which are showing intrusive relationship with ttgs, exposed in the eastern part of telangana state at university of hyderabad, gachibowli 9. Contemporaneous eruption of nbenriched basalts kadakites. Seismic anisotropy beneath the eastern dharwar craton.
Geochemistry of adakites and rhyolites from the neoarchaean. Continental lithosphere growth by accretion of diverse plume and arc terranes article pdf available in geoscience frontiers 33. A 2082 ma radiating dyke swarm in the eastern dharwar. Dharwar craton introduction and its extension classification difference between wdc and edc western dharwar craton eastern dharwar craton lithology dharwar supracrustal rocks sargur group bababudan group chitradurga group greenstone belts younger granites closepet granite regional structure metamorphism life economic. Narayanpet kimberlite field, eastern dharwar craton, southern india. Eastern dharwar craton such as sandur hanuma prasad et al.
African orogen in the west, southern granulite terrain pandyan mobile belt in. Ree geochemistry of ore zones in the archean auriferous. Numerous lamproite dykes are hosted by the eastern dharwar craton, southern india, particularly towards the northwestern margin of the cuddapah basin. Conclusion dharwar craton is a classical greenstonegranite terrain, divided into western and eastern dharwar craton. This paper explores such a relationship by detailing mineralogical and geochemical aspects of korakkodu lamprophyre dykes located within the well. Petrogenesis of proterozoic lamproites and kimberlites from. The eastern ghat orogeny affected the eastern dharwar craton, resulting in a narrow, highly deformed granulitefacies belt extending from madras in the south to near calcutta in the. The dharwar craton is divided in to the western and eastern dharwar craton wdc and edc by the ns trending chitradurga shear zone.
Pb ages for zircon and titanite from the ramagiri area. These dominate the eastern part of the dharwar craton and form the latest magmatic event in the craton jayananda et al. The narayanpet region is characterized by crustal deformation and forms a type area for the eastern subcraton 4. A craton is an ancient part of the earths continental crust which has been more or less stable since precambrian times. Subductioncollision processes and crustal growth in eastern.
Pdf mafic xenoliths in proterozoic kimberlites from. Neoarchean greenstone metamorphism in the eastern dharwar craton. They have diverse volcanic plume and arcassociations. Vi, indian institute of thtechnology bombay, 25th to 27 november, 2016, extended abstracts volume preliminary fluid inclusion study from. Highlights greenstone belts of the eastern dharwar craton, india, are composite tectonostratigraphic terranes. Pdf narayanpet kimberlite field, eastern dharwar craton.
Contemporaneous eruption of nbenriched basalts kadakites naadakites from the 2. The area exposes the ns trending kadiri greenstone belt. It is separated by the chitradurga shear zone close to the closepet granite. The distribution of au and associated trace elements in pyrite and arsenopyrite from late archean hutti and hirabuddini orogenic gold deposits, eastern dharwar craton, southern india was investigated by laser ablationinductively coupled plasmamass spectrometry. Petrology, mineral chemistry and geochemistry of the chromian muscovite bearing quartzite in the neoarchean veligallu schist belt, eastern dharwar craton, india abstract in. Crustal growth of the eastern dharwar craton geological society. The dharwar craton is considered to consist of two distinct geological subcratons, the older western dharwar craton and the eastern dharwar craton 2rajamani 1990, 3bruce foote, 1886.
Read a 2082 ma radiating dyke swarm in the eastern dharwar craton, southern india and its implications to cuddapah basin formation, precambrian research on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Age and basin evolution of the cuddapah supergroup, india julie mackintosh centre for tectonics, resources and exploration. The edc mainly consists of late archean granites interspersed with ns trending linear schist belts. The dharwar craton perhaps separated by the closepet batholith granite is dihow to cite this paper. Structural analysis of airborne radiometric data for. Dharwar craton is bound by deccan traps, granulite terrane and cuddapah basin. These have caused retrogression of the granulites and development of mylonites and augen gneisses. Evidence of archaean metamorphism from the yerrabali schist. The yerrabali schst belt ysb is located at the northeastern corner of the edc, near the karimnagar granulite belt. The wdc and edc are separated by a prominent shear zone along the eastern margin of the chitradurga. We present here a comprehensive mineralogical and geochemical including sr and nd isotopic study. However, a maor shear zone west of the closepet granite could also be.
It is divided into eastern dharwar craton and western dharwar craton owing to their differences in lithologies and ages. Greenstone belts of the eastern dharwar craton, india, are composite tectonostratigraphic terranes. Eclogite xenoliths from the kimberlites of the eastern. The granitegreenstone terrane in andhra pradesh is made up of vast stretches of granites and gneisses that enclose thin linear schist belts. Known kimberlite occurrences in the dharwar craton are confined to an area immediately west of the cuddapah basin. The porphyritic granitoids of adoni area, located 120 km west of cuddapah basin, are intrusive into the peninsular gneissic complex pgc of dharwar craton. The eastern and western parts of the dharwar craton are considered to have had distinct evolutionary histories. This paper deals with interpretation of the geochemical and. Traceelement geochemistry of pyrite and arsenopyrite. Edc consists of the older gneisses, greenstone belts of dharwar super group, closepet granite and charnokites. The wdc and edc are separated by the chitradurga shear zone,towards the western margin of closepet granite. Evidence of archaean metamorphism from the yerrabali. Dharwar craton archean dharwar craton covers a total area of 4. Dharwar craton, zircon, upb, hf model ages, crustal evolution 1.
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