Each of them is 34 times the size of the bundelkhand craton figure 2. The pyroxenites have a characteristic cumulate texture, with a predominance of pyroxene augite and. Detrital zircons in metasedimentary rocks from both yielded ages ranging from 3. However, a maor shear zone west of the closepet granite could also be. The archean dharwar craton is further divided into individual cratonic units based on the difference in the lithological composition and age of formation. This simple webbased tool lets you merge pdf files in batches. Eastern dharwar craton the dharwar craton has been divided lately into two cratons. Integration of aeromagntic data and landsat imagery for. Neoproterozoic extension in the greater dharwar craton. Crustal structure and tectonics of the northern part of the southern granulite terrane, india v.
Eriksson2 1school of biological, earth and environmental sciences, university of new south wales, sydney nsw 2052, australia 2department of geology, university of pretoria, pretoria 0002, south africa corresponding author email. If you are looking for a way to combine two or more pdfs into a single file, try pdfchef for free. Schist belt, eastern dharwar craton of anantapur district, ap, india using geospatial techniques. Implications for contrasting lithospheric mantle sources and geodynamic evolution of the eastern dharwar craton of southern india. They contain outliers of gulcheru sediments and are characterized by wellpreserved primary. If the ancient rocks are largely overlain by a cover of younger rocks then the hidden craton may be referred to as a platform. Where theleoitic and komatiitic meta basalts and felsic volcanic fromed. The geologic events responsible for jonnagiri started with accretion of the greenstone package at the subduction boundary between the eastern and western blocks of the dharwar craton, followed by their deformation, shearing, and metamorphism, with subsequent emplacement of the pagadarayi granodiorite and continued shearing, culminating with. Soda pdf merge tool allows you to combine two or more documents into a single pdf file for free. Magmatism, highgrade metamorphism and isotopic resetting of older minerals along the northern margin of the singhbhum craton, the bastar craton, the eastern dharwar craton, the central indian tectonic zone and the shillong plateau during the latest mesoproterozoic and earliest neoproterozoic all attest to continentwide processes acharyya et.
The dharwar craton lies roughly between chennai, goa, hyderabad, and mangalore in the karnataka and. Crustal structure and tectonics of the northern part of. Cratons whose ancient rocks are widely exposed at the surface, often with relatively subdued relief, are known as shields. Petrogenesis of lamprophyres synchronous to kimberlites from the wajrakarur kimberlite field.
Western dharwar craton western dharwar craton gorur gneiss33003400 ma the oldest gneiss in wdc is a tonalitetrondhjemitegneiss known as gorur gneiss. The western dharwar craton consists of paleoarchean 3. A free and open source software to merge, split, rotate and extract pages from pdf files. Proterozoic cuddapah basin, on the eastern margin of the dharwar craton is an intracratonic basin of the indian shield fig. Plate accretion and rifting in the eastern part of the dharwar craton and between the dharwar and bastar craton indicate multiple and complex events from 2600 to 500. Bimodal magmatism in the eastern dharwar craton, southern. Zircon upb age and luhf isotopic evolution of the east salem block, southeast india. Pdf petrology, mineral chemistry and geochemistry of the.
Petrology, mineral chemistry and geochemistry of the chromian muscovite bearing quartzite in the neoarchean veligallu schist belt, eastern dharwar craton, india abstract in the present study, we. However, due to juvenile granitic intrusions and strong reworking of the basement between. However, the mafic dykes of the western dharwar caton has been not studied well and in the current study, one of the major dyke swarm of the western dharwar craton. This site is like a library, use search box in the widget to get ebook that you want. Pbpb zircon ages of archaean metasediments and gneisses. Our pdf merger allows you to quickly combine multiple pdf files into one single pdf document, in just a few clicks. Banerjee e a national geophysical research institute csir, uppal road, hyderabad, andhra pradesh, india. Constraints on age, duration of volcanism and evolution. Pb, sr and nd isotope systematics of metavolcanic rocks of the hutti greenstone belt, eastern dharwar craton.
The grey gneiss complex covering the entire craton formerly known as peninsular gneiss. Geochronological and geochemical signatures of the. Greenstone metamorphism, hydrothermal alteration, and gold. The eastern boundary of the antananarivo domain is interpreted as the betsimisaraka su. Geochemical and zircon upb age data on granites of the chitrial area, situated at the ne part of the eastern dharwar craton, are presented to elucidate their petrogenesis, times of emplacement, and role in crust formation. Based on field and geochemical characters, these granites are classified as alkali feldsparmonzo. Dharwar craton is divided into two tectonic blocks in the year 1986 by rogers. Highlights greenstone belts of the eastern dharwar craton, india, are composite tectonostratigraphic terranes. The porphyritic granitoids of adoni area, located 120 km west of cuddapah basin, are intrusive into the peninsular gneissic complex pgc of dharwar craton. As part of the indian shield, it has been a relatively stable geologic terrain for several billion years. Western dharwar craton eastern dharwar craton these 2 cratons divided by the chitradurga shear zone. A paleoproterozoic giant radiating dyke swarm in the. The dharwar or karnataka craton in south india is a piece of the earths crust that dates back to the late archean.
Regional geology the dharwar protocontinent is subdivided into three distinct cratonic blocks. 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 sg was invaded by 26002500 ma granitoids1619. Continental lithosphere growth by accretion of diverse plume and arc terranes article pdf available in geoscience frontiers 33. Zircons from orthogneisses from the two parts also yielded similar ages. Contrasting lithospheric mantle across the suture between the eastern and western dharwar cratons, central india mapping the lithosphere data from 1080 peridotitic garnet xenocrysts have been used to map the vertical and lateral. Petrogenesis of lamprophyres synchronous to kimberlites. Easily combine multiple files into one pdf document. A craton is an ancient part of the earths continental crust which has been more or less stable since precambrian times. Merge pdf combine more pdf files into one free online. 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. The juxtaposition of these lithounits in most of the greenstone belts of western wdc and eastern edc sectors of the dharwar craton attests to plumearc accretion, generation of continental. Characterization of granitoids adjoining southern part of.
Click download or read online button to get the dharwar craton book now. 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. The basement for the dharwar sg is preserved in several places in wdc. Evolution of the singhbhum craton and supracrustal. Geochemistry of adakites and rhyolites from the neoarchaean gadwal greenstone belt, eastern dharwar craton, india. Reassembly of the dharwar and bastar cratons at ca.
Easepdfs online pdf merger can combine multiple pdf files into a single pdf in seconds. A comparison between the mafic dykes in the western and. The wdc and edc are separated by a prominent shear zone along the eastern margin of the chitradurga. The northern part of the nellorekhammam schist belt and the karimnagar granulite belt, which are juxtaposed at high angle to each other have unique upb zircon age records suggesting distinctive tectonothermal histories. A similar variety of models have been proposed for the transition between the dharwar craton and the eastern ghats cf. The dharwar craton perhaps separated by the closepet batholith granite is dihow to cite this paper. Contrasting lithospheric mantle across the suture between. 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. Pdf merge combinejoin pdf files online for free soda pdf. Geochemistry of granitoids of bilgi area, northern part of eastern dharwar craton, southern indiaexample of transitional ttgs derived from depleted source. Quickly merge multiple pdf files or part of them into a single one. The large areal extent, radiating dyke pattern and short duration imply a mantle plume origin for the dharwar giant dyke swarm.
Paleoproterozoic blocks that accreted to the dharwar craton raith et al. The granitegreenstone terrane in andhra pradesh is made up of vast stretches of granites and gneisses that enclose thin linear schist belts. 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. The craton is divided into two tectonic blocks after swaminath et al. Giritharan and rajamani, 19987 and ramagiri meenal mishra and rajamani, 19998. How to merge pdfs and combine pdf files adobe acrobat dc. The geology and basin evolutionary history of the dharwar craton is discussed. Pdf structural architecture and geological relationships.
Eastern dharwar craton are reported to be mainly of three different age groups. The craton consists of two parts the western dharwar craton wdc and the eastern dharwar craton edc. The dharwar craton is one of the major cratonic blocks in peninsular india and is composed of several ancient microcontinents where multiple continental growth and recycling occurred from 3. They were assembled in a subductionaccretion orogen as migrating arcs captured thick plumeplateaus. These migmatitic gneisses are believed to have originated by low degree of partial melting of basaltic rocks in the lower crust. These cratonic units include eastern dharwar craton edc and western dharwar craton. Seismic imaging of crust beneath the dharwar craton, india. They have diverse volcanic plume and arcassociations. The velocity image reveals thinner crust 3438 km in the late archean. Geology of the cuddapah basin and its lithostratigraphy. A postulated genesis of the wdc comprises early, c. Age and tectonic evolution of neoproterozoic ductile shear. The dharwar craton download ebook pdf, epub, tuebl, mobi. 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.
Pdf merger, combine pdf files into one file online. More than 60% of the state of andhra pradesh makes up the eastern part of the dharwar craton. Fresh outcrops of gorur gneiss are exposed in the stone quarries. Archean cratons provide windows to the crustal evolution history in the early earth.
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