Geochemical and Nd isotope constraints on petrogenesis of granitoids from NW part of the eastern Dharwar craton: Possible implications for late Archaean crustal accretion

The Neoarchean transition between medium- and high-K granitoids: Clues from the Southern São Francisco Craton (Brazil)

“…Biotite and two-mica granites are considered to represent purely crustal-derived granites formed by partial melting of an older TTG crust (e.g. Almeida et al, 2013, Dey et al, 2012 and/or from melting of metagreywackes and metapelites (e.g. Breaks and Moore, 1992).…”

Chapter 19 Geological history of the Kaladgi–Badami and Bhima basins, south India: sedimentation in a Proterozoic intracratonic setup

“…19.1a), which supplied detritus to the Kaladgi -Badami Basin. The Peninsular Gneiss is characterized as tonalites -trondhjemites -granodiorites (TTG; Dey et al 2009aDey et al , 2012. The Hungund -Kushtagi schist belt is dominated by metabasalts with subordinate felsic volcanic (adakites), meta-ultramafic and metasedimentary rocks (Naqvi et al 2006).…”

“…The Gadag and Shimoga belts are dominated by metagreywackes, metapelites, BIF and metabasalts belonging to the Chitradurga Group of the Dharwar Supergroup. The c. 2.5 Ga Closepet Granite consists of K-and large ion lithophile element (LILE)-enriched granodiorites (sanukitoids) and granites (Dey et al 2003(Dey et al , 2012. The NW -SE-trending structural trend of the basement rocks is oblique to the east -west trend of the Kaladgi -Badami Basin.…”

“…No timedependent variation of source was noted. Also, K-and LREE-rich granites are abundant in the basement (Dey et al 2003(Dey et al , 2012. Therefore, widespread post-depositional influx of these elements in the Kaladgi -Badami Basin can be refuted, although local redistribution of potassium might have occurred (Dey et al 2008a, b).…”

Petrography, geochemistry and geochronology of the potassic granitoids of the Rio Itacambiruçu Supersuite: implications for the Meso- to Neoarchean evolution of the Itacambira-Monte Azul block

“…As highlighted by Laurent et al (2014), several studies have suggested that the genesis of biotite granite is related to the partial melting of rocks with TTG signatures (e.g., Martin et al 1997, Champion & Sheraton 1997, Whalen et al 2004, Frost et al 2006, Manya et al 2007, Dey et al 2012, Mikkola et al 2012, Almeida et al 2013, Manya 2016. Such interpretations have been corroborated by experimental modeling studies in which high-potassium granitoids were generated from the partial melting of tonalites (with or without the presence of fluids) (Skjerlie & Johnston 1992, Skjerlie et al 1993, Castro 2004, Patiño Douce 2005, Watkins et al 2007.…”