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Intracontinental Thrusts and Inclined Transpression Along Eastern Margin of the East Dharwar Craton, India


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1 Geological Studies Unit, Indian Statistical Institute, Kolkata - 700 108, India
     

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Recent works suggest Proterozoic plate convergence along the southeastern margin of India which led to amalgamation of the high grade Eastern Ghats belt (EGB) and adjoining fold-and-thrust belts to the East Dhrawar craton. Two major thrusts namely the Vellikonda thrust at the western margin of the Nellore Schist belt (NSB) and the Maidukuru thrust at the western margin of the Nallamalai fold belt (NFB) accommodate significant upper crustal shortening, which is indicated by juxtaposition of geological terranes with distinct tectonostratigraphy, varying deformation intensity, structural styles and metamorphic grade. Kinematic analysis of structures and fabric of the fault zone rocks in these intracontinental thrust zones and the hanging wall and footwall rocks suggest spatially heterogeneous partitioning of strain into various combinations of E-W shortening, top-to-west shear on stratum parallel subhorizontal detachments or on easterly dipping thrusts, and a strike slip component. Although relatively less prominent than the other two components of the strain triangle, non-orthogonal slickenfibres associated with flexural slip folds and mylonitic foliationstretching lineation orientation geometry within the arcuate NSB and NFB indicate left lateral strike slip subparallel to the overall N-S trend. On the whole an inclined transpression is inferred to have controlled the spatially heterogeneous development of thrust related fabric in the terrane between the Eastern Ghats belt south of the Godavari graben and the East Dharwar craton.

Keywords

Inclined Transpression, Intracontinental Thrusts, Nallamalai Fold Belt, Nellore Schist Belt, Strain Triangle, Strain Partitioning.
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  • BOUCHEZ, J.L. (1977) Plastic deformation of quartzites at low temperatures in an area of natural strain gradient (Angers, France). Tectonophysics, v.39, pp.25-80.

  • CHAKRABORTI, S. and SAHA, D. (2009) Tectonic stresses and thinskinned tectonics in a Proterozoic fold-and-thrust belt read from calcite mylonites in the Cuddapah basin, south India. Indian Jour. Geol., v.78, pp.37-54.

  • DOBMEIER, C.J. and RAITH, M.M. (2003) Crustal architecture and evolution of the Eastern Ghats Belt and adjacent regions of India. In: M. Yoshida, B.F. Windley, and S. Dasgupta (Eds.), Proterozoic East Gondwana: Supercontinent Assembly and Breakup. Geol. Soc. London, Spec. Publ. no.206, pp.145-168.

  • DOBMEIER, C., LUTKE, S., HAMMERSCHMIDT, H. and MEZGER, K. (2006) Emplacement and deformation of the Vinukonda granite - implications for the geological evolution of peninsular India and for Rodinia reconstructions. Precambrian Res., v.146, pp.165-178.

  • FERNANDEZ-RODRIGUEZ, C., GONZALEZ-CASADO, J.M. and TEJERO, R. (1994) The external asymmetry of quartz c-axis fabric: a linear approximation to its statistical description. Jour. Struct. Geol., v.16, pp.263-276.

  • FOSSEN, H. and TIKOFF, B. (1993) The deformation matrix for simultaneous simple shearing, pure shearing, and volume change, and its application to transpression/transtension tectonics. Jour. Struct. Geol., v. l5, pp.413-422.

  • GHOSH, S.K. (2001) Types of transpressional and transtensional deformation. In: H.A. Koyi and N.S. Mancktelow (Eds.), Tectonic Modeling: A Volume in Honor of Hans Ramberg, Geol. Soc. America Mem., 193, pp. 1-20.

  • HUDLESTON, P.J., SCHULTZ-ELA, D. and SOUTHWICK, D.L. (1988) Transpression in Archean Greenstone belt, Minnesota. Canadian Jour. Earth Sci., v.25, pp.1060-1068.

  • JONES, R.R. and HOLDSWORTH, R.E. (1998) Oblique simple shear in transpression zones. In: R.E. Holdsworth, R.A. Strachan and J.F. Dewey (Eds.), Continental Transpressional and Transtensional Tectonics. Geol. Soc. London, Spec. Publ. no.135, pp.35-40.

  • JONES, R.R., HOLDSWORTH, R.E, CLEGG, P., MCCAFFREY, K. and TAVARNELLI, E. (2004) Inclined transpression. Jour. Structural Geol., v.26, pp.1531-1548.

  • JOY, S. and SAHA, D. (1998) Influence of micaceous impurity on dynamically recrystallized quartz c-axis fabric in L-S tectonites from the Singhbhum shear zone and its footwall, Eastern India. Jour. Struc. Geol., v.20, pp.1509-1520.

  • JOY, S. and SAHA, D. (2000) Dynamically recrystallised quartz caxis fabrics in greenschist facies quartzites, Singhbhum Shear Zone and its footwall, Eastern India - influence of high fluid activity. Jour. Struct. Geol., v.22, pp.777-793.

  • KAILA, K.L. and TIWARI, H.C. (1985) Structural trends in the Cuddapah basin from deep seismic soundings (DSS) and their tectonic implication. Tectonophysics, v.115, pp.69-86.

  • LAW, R.D. (1990) Cystallographic fabrics: a selective review of their applications to research in structural geology. In: R.J. Knipe and E.H. Rutter (Eds.), Deformation Mechanisms, Rheology and Tectonics. Geol. Soc. London, Spec. Publ. no.54, pp. 335-352.

  • LISTER, G.S. and DORNSIEPEN, U.F. (1982) Fabric transitions in the Saxony granulite terrain. Jour. Struct. Geol., v.4, pp.81-92.

  • MATIN,A. and GUHA, J. (1996) Structural geometry of the rocks of the southern part of the Nallamalai Fold Belt, Cuddapah Basin, Andhra Pradesh. Jour. Geol. Soc. India, v.47, pp.535-545.

  • MEANS, W.D. (1994) Rotational quantities in homogeneous flow and development of small-scale structures. Jour. Struct. Geol., v.16, pp.437-445.

  • MEIJERINK, A.M.J., RAO, D.P. and RUPKE, J. (1984) Stratigraphic and structural development of the Precambrian Cuddapah Basin, SE India. Precambrian Res., v.26, pp.57-104.

  • MUKHERJEE, M.K. (2001) Structural pattern and kinematic framework of deformation in the southern Nallamalai foldfault belt, Cuddapah district, Andhra Pradesh, Southern India. Jour. Asian Earth Sci., v.19, pp.1-15.

  • NARAYANSWAMI, S. (1966) Tectonics of the Cuddapah basin. Jour. Geol. Soc. India, v.7, pp.33-50.

  • PASSCHIER, C.W. and TROUW, R.A.J. (2005) Microtectonics. (2nd ed.), Springer-Verlag, Berlin, 322p.

  • RAMAM, P.K. and MURTY,V. N. (1997) Geology of Andhra Pradesh. Geol. Soc. India, Bangalore, 245p.

  • RAMBERG, H., (1975) Particle paths, displacement and progressive strain applicable to rocks. Tectonophysics, v.28, pp.1-37.

  • ROGERS, J.J.W. and SANTOSH, M. (2004) Continents and Supercontionents. Oxford University Press, New York, 289p.

  • SAHA, D. (1994) Fold-Fault structures of the Nallamalai range, Diguvametta-Nandi Ka Nama Pass, Prakasam district, Andhra Pradesh, South India, Indian Jour. Geol., v.66, pp.203-213.

  • SAHA, D. (2002) Multi-Stage Deformation in the Nallamalai Fold Belt, Cuddapah Basin, South India - Implications for Mesoproterozoic Tectonism Along Southeastern Margin of India, Gondwana Res., v.5, pp.701-719.

  • SAHA, D. (2004) Structural asymmetry and Plate tectonic set-up for a Proterozoic Fold and Thrust Belt: Nallamalai Fold Belt and Adjoining Terrane, South India. Geol. Surv. India Spec. Publ., v.84, pp.101-119.

  • SAHA, D. and CHAKRABORTY, S. (2003) Deformation Pattern in the Kurnool and Nallarnalai Groups in the Northeastern Part (Palnad Area) of the Cuddapah Basin, South India and its Implication on Rodinia/Gondwana Tectonics, Gondwana Res., v.6, pp.573-583.

  • SAHA, D. and CHAKRABORTI, S. (2007) Advective heat transfer and fabric development in a shallow crustal intrusive granite - the case of Proterozoic Vellaturu granite, south India. Jour. Earth System Sci., v.116, no.5, pp.433-450.

  • SAHA, D., GHOSH, G., CHAKRABORTY, A.K. and CHAKRABORTI, S. (2009) Comparable Neoproterozoic sedimentary sequences in Palnad and Kurnool subbasins and their paleogeographic and tectonic implications. Indian Jour. Geol., v.78, pp.175-192.

  • SANDERSON, D.J. and MARCHINI, R.D. (1984) Transpression. Jour. Struct. Geol., v.6, pp.449-458.

  • SARKARINEJAD, K. (2007) Quantitative finite strain and kinematic flow analyses along the Zagros transpression zone, Iran. Tectonophysics, v.442, pp.49-65.

  • SARKARINEJAD, K. and AZIZI, A. (2008) Slip partitioning and inclined dextral transpression along the Zagros Thrust System, Iran. Jour. Struc. Geol., v.30, pp.116-136.

  • SENGUPTA, S. and GHOSH, S. (2004). Analysis of transpressional deformation from geometrical evolution of mesoscopic structures from Phulad shear zone. Jour. Struct. Geol., v.26, pp.1961-1976.

  • SIMPSON, C. and DE PAOR, D.G. (1997) Practical analysis of general shear zones using the porphyroclast hyperbolic distribution method: an example from the Scandinavian Caledonides. In: S. Sengupta, (Ed.), Evolution of Geological Structures in Micro-to Macro-scales, Chapman and Hall, pp.169-184.

  • TIKOFF, B. and FOSSEN, H., (1993) Simultaneous pure and simple shear: the unified deformation matrix. Tectonophysics, v.217, pp.267-283.

  • VENKATAKRISHNAN, R. and DOTIWALA, F.E. (1987) The Cuddapah salient: a tectonic model for the Cuddapah basin, India, based on Landsat image interpretation, Tectonophysics, v.136, pp.237-253.

  • VIJAYA KUMAR and LEELANANDAM, C. (2008) Evolution of the Eastern Ghats belt, India: a plate tectonic perspective. Jour. Geol. Soc. India, v.72, pp.720-749.

  • WILSON, C.J.L. (1975) Preferred orientation in quartz ribbon mylonites. Geol. Soc. Amer. Bull., v.86, pp.968-974.


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  • Intracontinental Thrusts and Inclined Transpression Along Eastern Margin of the East Dharwar Craton, India

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Authors

Dilip Saha
Geological Studies Unit, Indian Statistical Institute, Kolkata - 700 108, India
S. Chakraborti
Geological Studies Unit, Indian Statistical Institute, Kolkata - 700 108, India
V. Tripathy
Geological Studies Unit, Indian Statistical Institute, Kolkata - 700 108, India

Abstract


Recent works suggest Proterozoic plate convergence along the southeastern margin of India which led to amalgamation of the high grade Eastern Ghats belt (EGB) and adjoining fold-and-thrust belts to the East Dhrawar craton. Two major thrusts namely the Vellikonda thrust at the western margin of the Nellore Schist belt (NSB) and the Maidukuru thrust at the western margin of the Nallamalai fold belt (NFB) accommodate significant upper crustal shortening, which is indicated by juxtaposition of geological terranes with distinct tectonostratigraphy, varying deformation intensity, structural styles and metamorphic grade. Kinematic analysis of structures and fabric of the fault zone rocks in these intracontinental thrust zones and the hanging wall and footwall rocks suggest spatially heterogeneous partitioning of strain into various combinations of E-W shortening, top-to-west shear on stratum parallel subhorizontal detachments or on easterly dipping thrusts, and a strike slip component. Although relatively less prominent than the other two components of the strain triangle, non-orthogonal slickenfibres associated with flexural slip folds and mylonitic foliationstretching lineation orientation geometry within the arcuate NSB and NFB indicate left lateral strike slip subparallel to the overall N-S trend. On the whole an inclined transpression is inferred to have controlled the spatially heterogeneous development of thrust related fabric in the terrane between the Eastern Ghats belt south of the Godavari graben and the East Dharwar craton.

Keywords


Inclined Transpression, Intracontinental Thrusts, Nallamalai Fold Belt, Nellore Schist Belt, Strain Triangle, Strain Partitioning.

References