Stratigraphic and structural development of the Precambrian Cuddapah basin, S.E. India

Meijerink, A.M.J.; Rao, D. P.; Rupke, J.

doi:10.1016/0301-9268(84)90017-2

Cited by 92 publications

(45 citation statements)

References 4 publications

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“…Earlier work supports a multi-stage contractional deformation of the NFB and the adjoining NSB (Meijerink et al 1984;Saha 2002;cf. Nagaraja Rao et al 1987).…”

Section: Regional Geologymentioning

confidence: 92%

“…The EGGB was tectonically juxtaposed against the NSB with a component of thrust movement along the contact. The NSB in turn was thrust over the NFB along an easterly dipping thrust (Narayanswami 1966;Meijerink et al 1984;Nagaraja Rao et al 1987;Venkatakrishnan and Dotiwala 1987;Saha 2002Saha , 2004.…”

Section: Regional Geologymentioning

confidence: 97%

“…Of the granitic bodies along the northeastern margin, the Vinukonda granite or Shivapuram granite are hosted by a suite of quartz-feldspar mylonitic gneiss, biotite gneiss with pockets of quartz-mica schist and pegmatite belonging to the NSB. A sequence of metasediments, namely quartzites and phyllites intercalated with thin impure marble bands, belonging to the Nallamalai Group, has been intruded by the Vellaturu granite along the eastern margin of the Nallamalai fold belt (Meijerink et al 1984;Nagaraja Rao et al 1987;Saha 2002).…”

Section: Regional Geologymentioning

confidence: 98%

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Advective heat transfer and fabric development in a shallow crustal intrusive granite — the case of Proterozoic Vellaturu granite, south India

Saha

Chakraborti

2007

J Earth Syst Sci

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Syntectonic plutons emplaced in shallow crust often contain intermediate-to low-temperature deformation microstructures but lack a high-temperature, subsolidus deformation fabric, although the relict magmatic fabric is preserved. The Proterozoic Vellaturu granite emplaced at the eastern margin of the northern Nallamalai fold belt, south India during the late phase of regional deformation has a common occurrence of intermediate-to low-temperature deformation fabric, superimposed over magmatic fabric with an internally complex pattern. But high-T subsolidus deformation microstructure and fabric are absent in this pluton. The main crystal plastic deformation and fluid enhanced reaction softening was concentrated along the margin of the granite body. Resulting granite mylonites show Y-maximum c-axis fabric in completely recrystallized quartz ribbons, dynamic recrystallization of perthites, and myrmekite indicative of fabric development under intermediate temperature (∼ 500-400 • C). The weakly-deformed interior shows myrmekite, feldspar microfracturing and limited bulging recrystallization of quartz. The abundance of prism subgrain boundaries is indicative of continuing deformation through low-temperature (∼ 300 • C). The relative rates of cooling influenced by advective heat transfer and deformation of the pluton seem to control the overall subsolidus fabric development. The rapid advective heat transfer from the interior in the early stages of subsolidus cooling was followed by slow cooling through intermediate temperature window as a well-developed phyllosilicate rich mylonitic skin around the granite body slowed down conductive heat loss. Low-T crystal plastic deformation of quartz was effected at a late stage of cooling and deformation of the shallow crustal granite body emplaced within the greenschist facies Nallamalai rocks.

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“…Earlier work supports a multi-stage contractional deformation of the NFB and the adjoining NSB (Meijerink et al 1984;Saha 2002;cf. Nagaraja Rao et al 1987).…”

Section: Regional Geologymentioning

confidence: 92%

Section: Regional Geologymentioning

confidence: 97%

Section: Regional Geologymentioning

confidence: 98%

See 1 more Smart Citation

Advective heat transfer and fabric development in a shallow crustal intrusive granite — the case of Proterozoic Vellaturu granite, south India

Saha

Chakraborti

2007

J Earth Syst Sci

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“…Deformation induced microstructure and fabric in the syntectonic Vellaturu granite also support deformation at deeper crustal levels in the northeastern NFB, where the amphibolite facies NSB rocks are thrust over the NFB (Saha and Chakraborti 2007). This is in contrast to the low temperature (250-300º C) deformation induced fabric in the Neoproterozoic Kurnool Group either in the footwall of the Palnad nappe in the northeast or close to the Rudravaram line (Meijerink et al 1984) in the west, which is discussed below. The low temperature deformation has overprinted earlier tectonic foliation in the Nallamalai rocks and produced calcite mylonites only in the vicinity of the major thrusts but not quartz mylonites, as in the footwall of the Palnad nappe or the Maidukuru thrust (Fig.…”

Section: Quartz C-axis Fabric and Its Asymmetrymentioning

confidence: 87%

“…The western margin of the NFB is referred to as the Rudravaram line (Meijerink et al 1984). A review of geology of the Rudravarm line along the western margin of the NFB, suggests westward tectonic transport of the Nallamalai rocks and presence of a major thrust (Maidukuru thrust) between the Paleo-Mesoproterozoic Nallamalai rocks and the Neoproterozoic Kurnool rocks ).…”

Section: Introductionmentioning

confidence: 98%

Intracontinental thrusts and inclined transpression along eastern margin of the East Dharwar craton, India

2010

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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.

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Reworking of a basement–cover interface during Terrane Boundary shearing

Bhadra¹,

Gupta²

2015

Ductile Shear Zones

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Stratigraphic and structural development of the Precambrian Cuddapah basin, S.E. India

Cited by 92 publications

References 4 publications

Advective heat transfer and fabric development in a shallow crustal intrusive granite — the case of Proterozoic Vellaturu granite, south India

Advective heat transfer and fabric development in a shallow crustal intrusive granite — the case of Proterozoic Vellaturu granite, south India

Intracontinental thrusts and inclined transpression along eastern margin of the East Dharwar craton, India

Reworking of a basement–cover interface during Terrane Boundary shearing

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