Eastern ghat mobile belt egmb is a highgrade nesw metamorphic belt to the south of the singhbhum block. The proterozoic eastern ghats mobile belt along the east coast of india shares a thrusted lower contact with the surrounding cratons. Sensitive high resolution ion microprobe shrimp upb dating of zircon from basement granite gneisses and nepheline syenites of the sinapalli nappe, occurring along the northwestern margin of the eastern ghats mobile belt, indicate high grade. The tectonic evolution of these provinces is summarized. Proterozoic orogenic belts and rifting of indian cratons. There has been a longstanding and scientifically contentious issue, concerning whether or not the eastern ghats mobile belt egmb extends.
The eastern ghats mobile belt egmb is a proterozoic granulite belt extending along the east coast of peninsular india. Tectonic evolution of the eastern ghats belt, india. Examination of landsat tm images, reconnaissance field traverses and the published geological maps from the eastern ghats mobile belt egmb, india, reveal a network of major ductile shear zones both within and at the margins. A unified model of neoarcheanproterozoic convergence and.
Spectroscopic and x ray diffraction studies on fluid. Apart from reconnaissance survey by individual geologists c. What is the difference between western ghat and eastern ghat duration. Stratigraphy and tectonics of eastern ghat mobile belt part 24 by prof. The eastern ghats of orissa form part of the eastern ghats mobile belt which extends from brahmani river in orissa to ongole in the state of andhra pradesh over a stretch of 900 km with a maximum. Therefore, this mobile belt played an important role in the construction of gondwanaland. Early archaean continental crust in the eastern ghats. Polymetallic mineralisation in sakoli fold belt 292 gold mineralisation in mahakoshal belt 296 zncupb sulphide mineralisation in betul belt 298 manganese mineralisations in the sausar group of rocks 300 phosphorite deposits in madhya pradesh 307 diamonds in central india 308 bauxite deposits in central india 3 chapter 3 eastern ghat. Aug 10, 20 from the oxford dictionary of earth sciences. Foldthrust belt geometry of the eastern ghats mobile belt. The eastern ghat mobile belt egmb, a tectonically active area extends along the eastern margin of peninsular india, is divided into three provinces, namely, eastern ghat province, the jeypore province, and the krishna province. Fill missing links of lithospheric deformation between lambert and mahanadi rifts.
The egmb exposes a deep crustal section through a composite orogenic belt that once formed part of the proterozoic mobile belt system within east antarctica and east india. The maliya range is located in the northern portion of the eastern ghats. Evidence of fossil anisotropy related to collision and rifting episodes of supercontinents. M,v, subba rao, national geophysical research institute, hyderabad 500 007 india two prominent rock suites constitute the lithology of the eastern. Alkaline intrusion in a granulite ensemble in the eastern ghats belt.
The eastern ghats mobile belt is an arcuate belt of the highgrade terrain located along the east coast of peninsular india. The eastern ghats mobile belt egmb extends in to the surrounding craton subrahmanyam and verma, a northeastsouthwest direction over a strike length 1986 and distinctive terrane boundary shear zones of 900 km along the east coast of india fig. A structural and zircon upb shrimp study of the foldthrust belt and. Shear zones are significant in understanding the physicochemical processes, such as mineralization, magmatism, metamorphism, and deformational patterns and bear remarkable influence on many aspects of earth system science.
The southern indian shield consists of 1 dharwar craton, 2 eastern ghat mobile belt, 3. A mobile belt is a synonym for orogenic belt, most often used for those earlier i. Deformational history of eastern ghat mobile belt around. Sri lankaindian eastern ghatseast antarctica and the. First shear wave splitting measurements from unexplored region of eastern ghats mobile belt and surrounding cratons. Tectonic evolution of the archaean highgrade terrain of. Jul 26, 2016 western ghatthe western ghat sahyadri hills is formed by the malabar plains and the chain of mountains running parallel to indias western coast,pass through the states of gujarat.
The sinapalli nappe is the lowermost nappe and rests over a tectonic contact on. The mobile belt is characterised by a nappe structure consisting of the lathore group and turekela group nappes, which display distinctive lithological assemblages and deformational. The mobile belt is characterised by a nappe structure consisting of the lathore group and turekela group nappes, which display distinctive lithological assemblages and deformational structures. The carbon isotope composition of graphite and carbon and oxygen isotope composition of associated calcite from different locations of the eastern ghats mobile belt egmb of orissa have been measured in order to understand the origin of graphite. Abstract the deformation pattern of the western margin of the eastern ghats mobile belt reveals the overthrusting relationship of the mobile belt with the craton. The present work describes one such complex near udayagiri from the northern margin of the egb, reported for the first time as udayagiri anorthosite complex uac. The thrust, known as the terrane boundary shear zone, is associated with two large lateral ramps resulting in a curved outline on the northwestern corner of the mobile belt. An understanding of their mutual relations is crucial for formulating crustal evolution models. The northwestern part of the eastern ghats mobile belt comprises a. The eastern ghat mobile belt representing proterozoic granulite terrain of peninsular india is juxtaposed with archaean cratons along a crustal ductile shear zone.
Stratigraphy and tectonics of eastern ghat mobile belt part 14 by prof. Tectonic connection of citz with egmb constituting middle protrozoic mobile belt mpmb was suggested by radhakrishna and naqvi 1986 which leelanandam et al. Reaction textures and metamorphic evolution of sapphirine. Here we report, the detailed spectr oscopic, x ray diffraction xrd and differential thermal analysis dta data on the fluiddeposited graphite from the eastern ghats mobile belt egb, andhra pradesh, i ndia. Chapter 6 collision of indian and eurasian plates and seismotectonics. The structure of the eastern ghats includes thrusts and strikeslip faults all along its range. Pdf deep crustal shear zones in the eastern ghats mobile. Tapas kumar biswal department of earth sciences, iit bombay. Eastern ghats mobile belt request pdf researchgate. The maliya range generally ranges between elevations of 9001200 m, although some of. H21 are related to the eastern ghat mobile belt egmb that extend towards the south h18 and the north h22. Petrotectonic imprints in the sapphirine granulites from. Eastern ghats mobile belt egmb, india, reveal a network of major ductile shear zones both within and at the margins.
Structural, geochronological and tectonic evolution of the central. Nanda and others published tectonic framework of eastern ghats mobile belt. The eastern ghats are made up of charnockites, granite gneiss, khondalites, metamorphic gneisses and quartzite rock formations. The craton is composed of the dharwar batholith dominantly granitic, greenstone belts, intrusive volcanics, and middle proterozoic to more recent sedimentary basins ramakrishnan and. Seismic evidence of crustal low velocity beneath eastern ghat. Mesoproterozoic eastern ghat mobile belt springerlink. Ravi kurnar 1, joachim saul dipankar sarkar 1, rainer kind.
Study of aeromagnetic data over part of eastern ghat mobile belt. Unlimited viewing of the articlechapter pdf and any associated supplements and figures. To the north it ends in eastern taiwan, the zone of active collision between the north luzon trough portion of the luzon volcanic arc and south china. The granulite facies eastern ghat mobile belt has been divided into four longitudinal zones which from east to west are. The egb, a precambrian high grade granulite belt, o ccurs. The nne trending, 100200 km wide, eastern ghat mobile belt experienced high grade metamorphism in the late proterozoic, when it finally accreted to the indian shield naqvi and rogers, 1996. Rock magnetism and palaeomagnetism of the oddanchatram. Indian shield 2 northwest indian shield, 3 central indian shield and 4 eastern indian shield. The sinapalli nappe is the lowermost nappe and rests over a tectonic contact on the archean granites and gneisses of the craton. Petrotectonic imprints in the sapphirine granulites from anantagiri, eastern ghats mobile belt, india pulak sengupta. Petrological evolution of the eastern ghats belt current. The evolution of eastern ghat mobile belt occurring in eastern india mainly in the states of odisha and andhra pradesh has been described by many authors 57. Timing and dynamics of the juxtaposition of the eastern.
Chemical constraints on the origin of the charnockites in the eastern ghat mobile belt, india. Reaction textures and metamorphic evolution of sapphirinespinelbearing and associated granulites from diguva sonaba, eastern ghats mobile belt, india volume 152 issue 2 divya prakash, deepak, praveen chandra singh, chandra kant singh, suparna tewari, makoto arima, hartwig e. The folds of the first generation, f1, are isoclinal, intrafolial and vary in style from reclined to upright. A structural and zircon upb shrimp study of the foldthrust belt and associated nepheline syenite plutons. Deformational structures, reported from the eastern ghat granulites, and the available geochronological data indicate that prograde metamorphism could have occurred at 3000100 and 2500100 ma during a compressive orogeny that was associated with high heat influx through mafic magmatism. Gravity and magnetic methods for geological studies. Contrasting pressuretemperaturedeformation history across a vestigial craton mobile belt boundary. Limestone, bauxite and iron ore are found in the eastern ghats hill ranges. Foldthrustbelt structure the proterozoic eastern ghats. Eastern ghats mobile belt egmb, a polycyclic, high grade metamorphic terrane occurs along the eastern margin of indian subcontinent. The eastern ghats mobile belt egmb derives its name from the mountain of eastern ghats in the east coast of india. Structure and tectonics of the indian peninsular shield. Petrology of the udayagiri anorthosite complex, eastern. Collision tectonics in the late precambrian eastern ghats.
Magnetotelluric evidence on the southward extension of the eastern. Deformational history of eastern ghat mobile belt around lathore, balangir district, orissa. In these cases, the gravity highs are observed over the younger proterozoic fold belts and lows over the adjoining older archean cratons that have been termed as paired gravity anomalies indicating proterozoic collision. The calcgneiss and garnetsillimanitegneiss of eastern ghat mobile belt around lathore bear the imprint of multiple phases of deformtion. Granulite belt denotes a contiguous terrain of gra nulite facies rocks at the northeastern coast of penin sular india. The southern indian shield consists of three major tectonic provinces viz. Architecture and evolution of the central eastern ghats. The eastern ghats belt egb, characterised by pervasive grenvillian granulite facies metamorphism, is the host to several 950 ma old massiftype anorthosite complexes. The aravalliedelhi and satpura mobile belts admb and smb and the eastern ghat mobile belt egmb in india form major proterozoic mobile belts with adjoining cratons and contemporary basins. The northwestern part of the eastern ghats mobile belt comprises a fold.
Pdf timing and dynamics of the juxtaposition of the. Deformation history of the nw salient of the eastern ghats mobile. Crustal architecture and evolution of the eastern ghats belt and. The folds of the first generation, f1, are isoclinal. Dharwar craton archean dharwar craton covers a total area of 4. Some structural observations in the eastern ghats mobile. Each of the above shields is characterized by one or more cratons and mobile belts usually with tectonized boundaries radhakrishna, 1990. Origin of graphite, and temperature of metamorphism in. Nov 27, 2015 extending from brahmani river in odisha to ongole in southeastern andhra pradesh, the terrane of highly deformed rocks that experienced ultrahightemperature granulite facies metamorphism and several invasions of generations of magmas of varied compositional types is recognized as the eastern ghat mobile belt. Citeseerx document details isaac councill, lee giles, pradeep teregowda. Nanda geological survey of india, unit8, nuapalli, bhubaneswar 751 012. Ahuja 2007, timing and dynamics of the juxtaposition of the eastern ghats mobile belt against the bhandara craton, india.
Magnetotelluric evidence on the southward extension of the. The philippine mobile belt has also been called the philippine microplate and the taiwanluzonmindoro belt. Timing and dynamics of the juxtaposition of the eastern ghats mobile belt against the bhandara craton, india. Contrasting pressuretemperaturedeformation history. In the reassembly of precambrian gondwanaland, many now dispersed precambrian mobile belts appear to be aligned, and this geometrical relationship may be significant. Eastern ghats mobile belt egmb, a polycyclic, high grade metamorphic terrane occurs along the eastern margin of indian subcontinent, bounded by the three archean cratons along suture zone which. Aeromagncfic anomaly, dharwar, bastar, eastern ghats. Bounded by panafrican pandyan mobile belt pmb towards the south, cretaceous deccan traps towards the north, proterozoic purana kaladgi and bhima basins, neoproterozoic eastern ghats mobile belt towards egmb toward east, arabian sea towards the west and archean.
This shear zone, referred to as lakhna shear zone in contact with bastar craton on the western margin of the belt, displays a granitic composition and. The middlelate proterozoic eastern ghats mobile belt egmb exhibits a conspicuous paired gravity anomaly structure with a relative gravity high over the egmb and low over the adjoining archaean cratons. Coronavirus task force updates from the white house as the u. Timing and dynamics of the juxtaposition of the eastern ghats. Pdf tectonic framework of eastern ghats mobile belt. A midproterozoic magnetization age of the oddanchatram anorthosite supports the view that this body was emplacedremobilized during the eastern ghat orogeny ma and this body can be seen as a western extension of the string of massiftype anorthosites in the eastern ghat mobile belt. Interpretation of tectonics of gondwanaland and rodinia, in reference to the deformation and tectonic setting of the eastern ghats mobile belt, delhiaravalli mobile belt and southern granulite terrane. Foldthrust belt geometry of the eastern ghats mobile belt, a. Pdf tectonic evolution of the eastern ghats belt, india. This has developed a pervasive axial planar gneissosity. However, recent findings suggest that synkinematic development of granulites took place in a compressional tectonic regime and that granulite facies metamorphism resulted from crustal thickening. Proceedings of workshop on eastern ghats mobile belt.
Ball, the geological survey of india provided a geological map of the egmb on 1. On the other hand, the mobile belt is a younger, highgrade granulite facies metamorphic belt surrounding the craton and has suffered from later deform ational episodes. A structural and zircon upb shrimp study of the fold. One example is the alignment of the sri lanka eastern ghats mobile belt of india, east antarctica, and the albany fraser province of southwest australia slegeaaf belt. There is no evidence in this zone for the collisional suture visualized by drury et al. Pdf the thrustcontact between the eastern ghats belt and. Stratigraphy and tectonics of eastern ghat mobile belt.
Ahujatiming and dynamics of the juxtaposition of the eastern ghats mobile belt against the bhandara craton, india. The most convincing features of the admb and the smb have been the crustal layers dipping from both sides in. The eastern ghats granulite belt of india has traditionally been described as a proterozoic mobile belt, with probable archaean protoliths. Sep 06, 2017 ii nwse faults that imparted echelon fabric to south western margin, and iii the nesw transverse faults, oriented parallel to the grain of the eastern ghat mobile belt transecting the godavari valley basin into different subblocks. Bhattacharya geological studies unit, indian statistical institute, calcutta 700035, india received 9 october 1995. Characteristics of cordierite iolite of bandarguha. Along its northwestern margin, the mesoneoproterozoic granulites of the eastern ghats belt are juxtaposed against the palaeoproterozoic archaean lithologies of the bastar craton along a crustal ductile scale shear zone. This mobile belt is considered to lie between the archean indian craton and the eastantarctic craton in gondwanaland. Mantle deformation patterns and signatures of rift. The deformation pattern of the western margin of the eastern ghats mobile belt reveals the overthrusting relationship of the mobile belt with the craton. Eastern ghats mobile belt egmb is a well documented precambrian entity of the indoantarctica assembly of gondwanaland extending for. Extending from brahmani river in odisha to ongole in southeastern andhra pradesh, the terrane of highly deformed rocks that experienced ultrahightemperature granulite facies metamorphism and several invasions of generations of magmas of varied compositional types is recognized as the eastern ghat mobile belt.
Proceedings of workshop on eastern ghats mobile belt istarna gha. Madhurawada dome in the eastern ghats mobile belt is formed by a tectonic arrangement with the khondalite suite and quartz archean rocks along the eastern ghats north of visakhapatnam. The papi hills papi kondalu are distributed among the khammam, east godavari and west godavari districts of andhra pradesh and lie in the eastern ghats. Jul 01, 2001 read the eastern ghats mobile belt, india. Jul 01, 2000 read foldthrust belt geometry of the eastern ghats mobile belt, a structural study from its western margin, orissa, india, journal of african earth sciences on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Citeseerx tectonics of the eastern ghats mobile belt.
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