naa a22 4500 510755062 CHVBK 20180411083119.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s12594-013-0100-0 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0100-0 Petrology and geochemistry of metapelites and basic granulites from Sonapahar region of Shillong Meghalaya gneissic complex, North East India [Elektronische Daten] [S. Dwivedi, K. Theunuo] The geochemistry of the metapelites and basic granulite of Sonapahar has been studied in order to assess the nature of the protolith and their likely tectonic environment. Metapelites contains SiO2 (av. 62.16wt %), K2O+Na2O (av. 4.57 wt%), Al2O3 (av. 16.69 wt%), MgO (av. 5.31 wt%), Mg# av. 0.60 and low TiO2 (av. 0.68 wt%) with low Y (av. 23.48 ppm) and Yb (av. 1.6 ppm) which point to their derivation from andesite source. Metapelites show prominent negative europium anomaly (EuN/Eu* = 0.38-0.54) and fractionated LREE to HREE pattern (LaN/LuN) 17.23 to 56.69. Basic granulites demonstrate low content of SiO2 (av50.95 wt%), Al2O3 (av13.67 wt%), K2O (av 0.58 wt%) and enriched in Fe2O3 t (av 11.42 wt%), MgO (av 7.29 wt%), CaO (av 10.60 wt %), Na2O (av 2.26 wt%), Mg# av. 0.56 and range from calc-alkaline to tholeiitic in nature. The geochemistry of the metapelites and basic granulites advocate that metapelites are derived from arc related andesitic source due to subduction whereas protoliths of basic granulites was originated in rift related volcanism through diapiric movement of hot rising mantle derived basaltic magmas. Geological Society of India, 2013 Metapelites nationallicence REE nationallicence Andesite nationallicence Fractional crystallization nationallicence Protolith nationallicence Shillong Meghalaya gneissic complex nationallicence Dwivedi S. Department of Civil Engineering, Indian Institute of Technology (Banaras Hindu University), 221 005, Varanasi, India aut Theunuo K. Department of Civil Engineering, Indian Institute of Technology (Banaras Hindu University), 221 005, Varanasi, India aut Journal of the Geological Society of India Springer-Verlag 81/6(2013-06-01), 755-766 0016-7622 81:6<755 2013 81 12594 https://doi.org/10.1007/s12594-013-0100-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0100-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dwivedi S. Department of Civil Engineering, Indian Institute of Technology (Banaras Hindu University), 221 005, Varanasi, India aut NATIONALLICENCE 700 1- Theunuo K. Department of Civil Engineering, Indian Institute of Technology (Banaras Hindu University), 221 005, Varanasi, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer-Verlag 81/6(2013-06-01), 755-766 0016-7622 81:6<755 2013 81 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer