Kamal Kant Sharma
Government Post Graduate College
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Journal of Earth System Science | 2004
Kamal Kant Sharma
Malani is the largest event of anorogenic felsic magmatism (covering ∼50, 000 km2) in India. This magmatic activity took place at ∼750 Ma post-dating the Erinpura granite (850 Ma) and ended prior to Marwar Supergroup (680 Ma) sedimentation. Malani eruptions occurred mostly on land, but locally sub-aqueous conditions are shown by the presence of conglomerate, grits and pillow lava. The Malani rocks do not show any type of regional deformation effects. The Malanis are characterised by bimodal volcanism with a dominant felsic component, followed by granitic plutonism and a terminal dyke phase. An angular unconformity between Malani lavas and basement is observed, with the presence of conglomerate at Sindreth, Diri, and Kankani. This indicates that the crust was quite stable and peneplained prior to the Malani activity. Similarly, the absence of any thrust zone, tectonic mélange and tectonised contact of the Malanis with the basement goes against a plate subduction setting for their genesis. After the closure of orogenic cycles in the Aravalli craton of the northwestern shield, this anorogenic intraplate magmatic activity took place in a cratonic rift setting under an extensional tectonic regime.
Journal of Earth System Science | 2017
Stefan Schöbel; Kamal Kant Sharma; Thorsten Hörbrand; Theresa Böhm; Ines Donhauser; Helga de Wall
The Neoproterozoic Sindreth Basin, NW India, and its surrounding area represent a half graben structure situated between the undeformed Malani Igneous Suite (MIS) in the west and a corridor of coeval Cryogenian ductile deformation, anatexis and granite intrusion in the east. The main lithologies observed in the basin are conglomerate, fanglomerate, debris flow and lake deposits derived from a nearby continental provenance, intercalated with concurrent mafic and felsic lava flows. Based on geological traverses across the strike of the basin, we propose a three-fold classification comprising Lower Clastic Unit and an Upper Clastic Unit and a Bimodal (basalt–rhyolite) Volcanic Unit separating the two. Tilting due to basin inversion and faulting has been observed; however, the rocks are unmetamorphosed and show undisturbed primary sedimentary features. The stratigraphic record of the basin is characteristic for deposition and magmatism in a fault-related continental setting. Implications of the findings have been discussed in the context of Neoproterozoic crustal dynamics in NW India. This study provides conclusive evidence for a continental setting for Sindreth Basin evolution and contests the recent models of active subduction setting (either back-arc basin or accretionary sediments over a subduction zone).
Journal of Earth System Science | 2015
Lars Scharfenberg; Helga de Wall; Stefan Schöbel; Alexander Minor; Marcel Maurer; Manoj K. Pandit; Kamal Kant Sharma
Natural gamma ray measurements using a portable device were performed at 157 sites in the area around Sirohi town and Sindreth village in Rajasthan (NW India). This region comprises sedimentary rocks, metasediments, granites and gneisses that bear characteristic GR dose values and U/Th ratios corresponding with their specific geological history. A-type Malani granites and rhyolitic derivates, also referred as high heat production granites, show distinct differences as compared to the S-type Erinpura and Balda granites, most prominent in a high Th content of the former (up to 90 ppm). Sedimentary rocks in the Sirohi and Sindreth area are variable in their signatures reflecting their variable source rocks. In the area between the Balda and Paladi villages, northeast of Sirohi, measurements in vicinity of a N–S running shear zone, have shown U enrichment up to 8 ppm. This shear zone has been synkinematically mineralized with quartz and shows evidence of fluid infiltration into the host rocks in the vicinity of the shear zone. Erinpura granites have been altered due to fluid activity and show a light depletion of K (3.96%) and Th (20.11 ppm) as compared to the unaltered rocks (K, 4.06; Th 24.46 ppm). Enrichment of U (with a mean value of 13 ppm) has also been recorded in the lower clastic unit of the Sindreth Basin, especially within gritty conglomerates wherein migration and precipitation along fault planes is proposed.
Precambrian Research | 2012
Ritesh Purohit; Dominic Papineau; Alfred Kröner; Kamal Kant Sharma; A.B. Roy
Journal of Asian Earth Sciences | 2012
Archisman Sen; Kanchan Pande; Ernst Hegner; Kamal Kant Sharma; A.M. Dayal; Hetu C. Sheth; Harish Mistry
Precambrian Research | 2014
Helga de Wall; Manoj K. Pandit; Kamal Kant Sharma; Stefan Schöbel; Jana Just
Journal of Earth System Science | 2011
Manoj K. Pandit; H. de Wall; H Daxberger; Jana Just; Michel Bestmann; Kamal Kant Sharma
Journal of The Geological Society of India | 2010
Helga de Wall; Stefan Schöbel; Manoj K. Pandit; Kamal Kant Sharma; Jana Just
International Journal of Earth Sciences | 2017
Kanchan Pande; Ciro Cucciniello; Hetu C. Sheth; Anjali Vijayan; Kamal Kant Sharma; Ritesh Purohit; K. C. Jagadeesan; Sapna Shinde
Journal of Earth System Science | 2013
Archisman Sen; Kanchan Pande; Hetu C. Sheth; Kamal Kant Sharma; Shraboni Sarkar; A. M. Dayal; Harish Mistry