naa a22 4500 510756662 CHVBK 20180411083125.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1007/s12594-013-0176-6 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0176-6 Crustal evolution and tectonics of the Archean Bundelkhand craton, Central India [Elektronische Daten] [S. Gokarn, C. Rao, C. Selvaraj, G. Gupta, B. Singh] Magnetotelluric studies over the Bundelkhand craton indicates a high resistivity sub-structure, typically observed in the Archean-Proterozoic regions. The geoelectric section shows a single high resistivity layer in the northern part of the craton, extending from surface to a depth of about 60 km and a three layered resistivity structure overlying a conductive bottom in its southern part. The geological studies reported earlier have delineated an EW trending zone of ultramafic rocks, called the Bundelkhand tectonic zone (BTZ), which marks the divide between the two electrical resistivity patterns. The geoelectric structure is broadly indicative of a northward dipping tectonic fabric in this region which conforms to the Himalayan subduction, to the immediate north of this craton. However this observation cannot explain the findings from geochemical, isotope analysis and geological studies, suggesting possible vertical block movements in the region, which are also indicated in the Bouguer gravity studies. The geoelectric structure beneath the Vindhyan group to the south shows low resistivities even up to 60 km, suggesting that the Bundelkhand craton which is characterized by high resistivity rocks, does not extend to the south beneath the Vindhyans, as was believed by the earlier researchers. A low resistivity body with an extremely high conductance of about 100,000 Siemens is delineated at the mid crustal depths beneath the exposed Bijawars south of Bundelkhand craton. The causative factors behind this low resistivity are not immediately apparent, but some possibilities are discussed here. Geological Society of India, 2013 Crustal evolution nationallicence Tectonics nationallicence Bundelkhand craton nationallicence Central India nationallicence Gokarn S. Indian Institute of Geomagnetism, Kalamboli Highway, 410 218, New Panvel, India aut Rao C. Indian Institute of Geomagnetism, Kalamboli Highway, 410 218, New Panvel, India aut Selvaraj C. Indian Institute of Geomagnetism, Kalamboli Highway, 410 218, New Panvel, India aut Gupta G. Indian Institute of Geomagnetism, Kalamboli Highway, 410 218, New Panvel, India aut Singh B. Indian Institute of Geomagnetism, Kalamboli Highway, 410 218, New Panvel, India aut Journal of the Geological Society of India Springer India 82/5(2013-11-01), 455-460 0016-7622 82:5<455 2013 82 12594 https://doi.org/10.1007/s12594-013-0176-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0176-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gokarn S. Indian Institute of Geomagnetism, Kalamboli Highway, 410 218, New Panvel, India aut NATIONALLICENCE 700 1- Rao C. Indian Institute of Geomagnetism, Kalamboli Highway, 410 218, New Panvel, India aut NATIONALLICENCE 700 1- Selvaraj C. Indian Institute of Geomagnetism, Kalamboli Highway, 410 218, New Panvel, India aut NATIONALLICENCE 700 1- Gupta G. Indian Institute of Geomagnetism, Kalamboli Highway, 410 218, New Panvel, India aut NATIONALLICENCE 700 1- Singh B. Indian Institute of Geomagnetism, Kalamboli Highway, 410 218, New Panvel, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer India 82/5(2013-11-01), 455-460 0016-7622 82:5<455 2013 82 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer