naa a22 4500 510756751 CHVBK 20180411083125.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1007/s12594-013-0178-4 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0178-4 Proterozoic crustal scale shearing in the Bundelkhand massif with special reference to quartz reefs [Elektronische Daten] [A. Bhattacharya, S. Singh] Quartz reefs that constitute the most spectacular feature of the Bundelkhand massif of Central India are as yet riddled with controversy. We consider the NE-SW trending quartz reefs and the NE-SW trending brittle-ductile shear system developed outside the quartz reefs to constitute a single tectonic fabric of the massif. The study of structural features of the quartz reefs and the associated NE-SW trending shear zones coupled with the mineralogical and structural features suggests that the quartz reefs represent strike-slip dominated vertical to subvertical shear zones with dominantly sinistral sense of shear. The loci of the quartz reefs constitute the large scale fractures developed as a consequence of extensional processes in this part of Central India. These fractures were the sites for later emplacement of siliceous magmatic melt, commonly known as quartz reef that was also responsible for the mineralization of some base metals as well as pyrophyllite and diaspore. The lithotectonic system of these quartz reefs thus developed was later on subjected to strike-slip movements. A generalized model of large scale extensional tectonics during the Proterozoic times has thus been suggested for the development of the NE-SW tectonic fabric of the Bundelkhand massif. Geological Society of India, 2013 Quartz reefs nationallicence Tectonics nationallicence Crustal openings nationallicence Strike-slip shearing nationallicence Bundelkhand massif nationallicence Central India nationallicence Bhattacharya A. Centre of Advanced Study in Geology, University of Lucknow, 226 007, Lucknow, India aut Singh S. Department of Geology, Bundelkhand University, 284 128, Jhansi, India aut Journal of the Geological Society of India Springer India 82/5(2013-11-01), 474-484 0016-7622 82:5<474 2013 82 12594 https://doi.org/10.1007/s12594-013-0178-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0178-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bhattacharya A. Centre of Advanced Study in Geology, University of Lucknow, 226 007, Lucknow, India aut NATIONALLICENCE 700 1- Singh S. Department of Geology, Bundelkhand University, 284 128, Jhansi, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer India 82/5(2013-11-01), 474-484 0016-7622 82:5<474 2013 82 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer