Crustal structure and tectonics of the northern part of the southern granulite terrane, india v. Pdf geology of the achankovil shear zone, southern india v s. The recently observed gas bubbles streaming water jets in the ponds along the. A number of parallel lineaments demarcate this 1520 km wide shear zone. An excellent correlation of structural trends exists on all scales of observation. Achankovil shear zone, a major crustal discontinuity in south india, which extends for about 120 km in a nwse direction, separates the khondalite belt from the terrain of massive charnockites in the north. The study area is situated in southern western ghats, part of the kollam district, about 40 km east of the punalur and 30 km west of the shenkottai, tamil nadu. The acsz separates the madurai block from the trivandrum block to the south. Ductile shear zones generally record a noncoaxial deformation and may range from the grain scale to the scale of a few hundreds of kilometres in length and a few kilometres in width. Review of flanking structures in meso and microscales.
Extension of achankovil shear zone, southern granulite. Achankovil shearzone,a manifestation of the forthcoming major seismotectonic activities of indian plate. Dunite, glimmerite and spinellite in achankovil shear zone, south india. Geology of the achankovil shear zone, southern india deepdyve. Volume issue ovember iss o 5 environment epiphytic. Indiathe palghatcauvery shear zone and achankovil shear zone have been. Microstructurally controlled monazite chronology of ultrahigh. Pdf shear lineaments analysis of ambasamudramtenkasi. Some workers consider these two boundaries as two independent shear zones viz. The wnwese trending achankovil shear zone asz in southern india is a major crustal discontinuity of proterozoic age which separates kerala khondalite belt kkb in. Simplified model of the connection between faults, which normally form in the upper crust, and classic ductile shear zones. Role of microfabrics and magnetic fabrics in the tectonic. Achankovil shear zone is a major tectonic crustal segment of south india. Mar 27, 2019 the achankovil shear zone aksz is a nwse trending ductile shear zone passing through the southern granulite terrain sgt has remained enigmatic among scientific community for the perspective of shear zone status and extension.
Pdf charnockitisation of achankovil shear zone researchgate. Dextral panafrican shear along the southwestern edge of the. Asz is a weak zone of proterozoic age with pan african traces2. Paleoposition of india and madagascar at 500 ma in the gondwanaland assembly modified after rekha et al. Implications for highly potassic co 2 rich melt influx along an intracontinental shear zone, gondwana research on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Oct 26, 2017 the achankovil shear zone aksz in the southern granulite terrain separates the trivandrum block from the madurai block. The achankovil shear zone aksz is a nwse trending ductile shear zone passing through the southern granulite terrain sgt has remained enigmatic among scientific community for the perspective of shear zone status and extension. The suruli shear zone and regional scale folding pattern. Deep electrical signatures across the achankovil shear. Structure and tectonics of the achankovil shear zone, southern india article in gondwana research 101. The entire region of study falls in the southern granulitic terrain s gt. Preliminary study on tectonic strain pattern of granites. The wnwese trending achankovil shear zone asz in southern india is a major crustal discontinuity of proterozoic age which separates kerala khondalite belt kkb in the south from the charnockite massif in the north.
Gravity signatures, derived crustal structure and tectonics of achankovil shear zone, southern india. Achankovil is a river in kerala, india, created towards the southern tip of the peninsula by the confluence of the rishimala, pasukidamettu, and ramakkalteri rivers. Achankovil shear zone of tirunelveli regions revisited to examine the charnockitisation processes of this region. It is also one among the famed pancha sastha temples in kerala, the other four being kulathupuzha, aryankavu, sabarimala and kanthamala temples. Shear lineaments analysis of ambasamudramtenkasi transect of achankovil tambraparani shear zone, south india. The zone forms the western part of the regional proterozoic highstrain zone recognised by drury and holt 1980 that encompasses the moyar and bhavani shear zones. The bavali shear zone is a major proterozoic structure in the southern granulite terrain sgt of peninsular india. Various geomorphic indices and longitudinal profiles of the river systems in the aksz, viz. Pdf achankovil shear zone of tirunelveli regions revisited to examine the charnockitisation processes of this region. The northern boundary of the shear zone is considered to be coinciding with the straight section of the achankovil river while the southern boundary is confined to a long narrow valley passing through the tenmalai village. Field occurrence of highgrade metamorphic rocks in punnalathupadi a, b, vallikodu kottayam c to g, and muthupezhungal h to 0 within the achankovil shear zone. Slip partitioning across the western margin of the eastern california shear zone basin and range province pdf.
Shear lineaments analysis of ambasamudramtenkasi transect of achankovil tambraparani shear zone, south india manimaran g. Shear lineaments analysis of ambasamudramtenkasi transect. Rocks in the tenmala shear zone include charnockite, garnetbiotite gneiss, garnetsillimanite gneiss, cordierite gneiss, and granite. An integrated approach to resolve the kinematics of the controversial achankovil shear zone aksz has been attempted involving remote sensing data. Read deep electrical signatures across the achankovil shear zone, southern granulite terrain inferred from magnetotellurics, gondwana research on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at. A second look at the trajectories of the rivers and drainage mentioned above and the structural features on the outcrops indicate that the uplift is neotectonically induced rather than shear induced. Oct 22, 2015 the achankovil shear system is one of the major crustal scale structures in peninsular india. Drainage development in achankovil shear zone, south india. The transition is gradual and known as the brittle.
In a nutshell, the suruli shear zone could be a splay, rotational thrust or reverse fault. Oct 01, 2001 read geology of the achankovil shear zone, southern india, gondwana research on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. In previous studies, the two major crustal scale zones in southern. Please redirect your searches to the new ads modern form or the classic form. Glimmerite has also been referred to as biotitite, though the use of this term to describe phlogopiterich rocks has been criticized.
Introduction strain is a change in the relative configuration of the particle in an element of body. As the pivot is located near achankovil shear zone which trends wnwese dip towards ssw, the suruli shear zone could be splaying branching out from achankovil shear zone. Generalized geologic map of southern kerala showing the distribution of various lithologies and the achankovil shear zone modi. Origin of graphite in glimmerite and spinellite in achankovil shear zone, southern india. Implications of shearing on drainage network development in. Structure and tectonics of the achankovil shear zone, southern india structure and tectonics of the achankovil shear zone, southern india rajesh, k. This nwse trending shear zone stretches across the western ghats for a strike length of 120 km. Structure and tectonics of the achankovil shear zone, southern india. The achankovil shear belt of the southern indian peninsular shield is prominent on landsat images. The wnwese trending achankovil shear zone asz in southern india is a major crustal discontinuity of proterozoic age which separates kerala khondalite belt kkb in the south from the.
Age and tectonic evolution of neoproterozoic ductile shear. Recent repeated occurrences of gas bubbles streaming water jets. The achankovil shear zone asz is a wnwese trending ductile shear zone that extends about km across the southern parts of kerala. Kinematic indicators include stretched and asymmetric garnet, feldspar and quartz porphyroclasts. There are various interpretations proposed regarding kinematics and tectonic evolution of asz35, as to whether it is a shear zone3, a zone of high strain6 or a simple geomorphic expression7.
Multi panafrican shearing along nwse to wnwese achankoil tambraparni shear ats zone and its contiguous and parallel tenmalaigatana shear tgs of south india and their associated shear features are reported. Mar 25, 2020 potential sites of this suture lie in the palghatcauvery shear zone, along the northern margin of the madurai block 8 and within the southern madurai blockachancovil zone 1 with the remnants of. A granulite facies kalsiliteleucitehibonite association from punalur, southern india. To the west, the area is bound by the west coast fault wcf which late mesozoic rifting, deccan trap.
The bavali shear zone is a major deformational zone with a contrast in lithology, structure and metamorphism across it nair et al. A shear zone is a tabular zone in which strain is notably higher than in the surrounding rock. Colorado mineral belt 327 words exact match in snippet view article find links to article needed the belt is a northeaststriking zone defined by. During site exploration, the author found rocks of volcanic origin distributed. Achankovil shear zone in southern india rajesh, 2010. Structural and metamorphic evolution of the melur migmatites. Suruli shear zone could be a rotational thrust or reverse fault with the pivot located close to kadaiyanallur. Asz is defined as achankovil shear zone somewhat frequently.
Citeseerx morphoecotypes of endemic flowering plants. It coincides with the boundary between charnockites of the madurai block to the north and khondalites of the trivandrum block to the south, and with a major change in the aeromagnetic pattern that can be traced across southern india. Recent repeated occurrences of gas bubbles streaming water. Implications for gondwana assembly, tectonophysics on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at. Pdf drainage development in achankovil shear zone, south. Journal of mineralogical and petrological sciences.
Ac achankovil shear zone, am ampanihy shear zone, bc bhavanicauvery shear zone, be bereketa shear zone, ej ejeda shear zone, kkpt karur kambampainavutrichur shear zone, ma moyarattur shear zone, pc palghatcauvery shear zone. Dunite, glimmerite and spinellite in achankovil shear zone. The cauvery shear zone system, comprising the moyarbhavani and palghatcauvery shear zones. Introduction the achankovil shear zone is a well deciphered lineament of 825 km width on landsat imageries and aerial photos mosaic trending wnwese to nwse direction and it. Pdf multiphase shear features of panafrican shearing. Two periods of charnockitic magma intrusion during d2 and d3 deformations are. A n ew gem mineral thomas hainschwang, franck notari, laurent massi, thomas armbruster. An integrated approach to resolve the kinematics of the controversial achankovil shear zone aksz has been attempted involving remote sensing data, shaded. Semantic scholar extracted view of the achankovil shear zone, southern india.
Read geology of the achankovil shear zone, southern india, gondwana research on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Shear lineaments analysis of ambasamudramtenkasi transect of. It joins with the pamba river at veeyapuram, in the alappuzha district of kerala. Crustal structure and tectonics of the northern part of the. Status of karurkambampainavu trichur shear zone, southern. Threedimensional lithospheric electrical structure of. Read dunite, glimmerite and spinellite in achankovil shear zone, south india. Progressive mylonitisation and shear fabrics, corresponding to a progression in strain as displayed by grain size reduction, flattening, elongation and.
An integrated approach to resolve the kinematics of the controversial achankovil shear zone aksz has been attempted involving remote sensing data, shaded relief topomaps, ground details of lithology and mesoscopic structures. Achankovil sastha temple is a hindu temple and one of the 108 sasthalayas, located in pathanapuram tehsil of kollam district in the indian state of kerala. Nature of the crust below the southern granulite terrain sgt. Read geometry and kinematics of the late proterozoic angavo shear zone, central madagascar. These shear zones are now known as 1 the moyarattur shear zone, 2 the bhavani shear zone, 3 the palghat cauvery shear zone pcsz, and 4 the achankovil shear zone. This zone has a lateral extension of 120 km and its width varies within 1020 km and passes through the states of kerala and tamil nadu in a wnw ese direction.
View academics in achankovil shear zone on academia. Cauvery shear zone pcsz in the north, and the wnw ese trending achankovilthenmalai shear zone atsz in the south. Granites, fry method, tectonic strain, south india, achankovil shear zone. Macroscopic samples of hibonite are generally opaque and at best translucent, though very small transparent pale yellow to brown crystals were reported from the tanzanian occurrence. The strain gradients from mylonite to undeformed rock are criteria to distinguish largescale shear zones from regional deformation. Implications for highly potassic co2rich melt influx along an intracontinental shear zone rajesh, v. Structural and remote sensing studies of achankovil suture. Available formats pdf please select a format to send.
Geology of the achankovil shear zone, southern india. Implications for highly potassic co 2rich melt influx along an intracontinental shear zone. Cordierite gneiss from the achankovil shear zone fig. Aug 01, 2006 structure and tectonics of the achankovil shear zone, southern india structure and tectonics of the achankovil shear zone, southern india rajesh, k. Request pdf structure and tectonics of the achankovil shear zone, southern india an integrated approach to resolve the kinematics of the controversial. Pdf geology of the achankovil shear zone, southern india. Structure and tectonics of the achankovil shear zone. The bhavani shear zone is one of the major transcrustal shear zones and trends enewsw separating late archaean to early proterozoic nilgiri granulite in the north and the cauvery shear zone in the south. Glimmerite may contain minor rutile and ilmenite, and variants of glimmerite bearing graphite, spinel, ankerite, pyrite, apatite, and the. Many studies were carried out to understand the origin and delineation of this structure. An integrated approach to resolve the kinematics of the controversial achankovil shear zone aksz has been attempted involving remote sensing data, shaded relief topomaps, ground details of. The achankovil shear zone aksz in the southern granulite terrain separates the trivandrum block from the madurai block. Nature of the crust below the southern granulite terrain. Glimmerite is an igneous rock consisting almost entirely of dark mica biotite or phlogopite.
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