Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5881
AuthorsCesare, B.* 
Ferrero, S.* 
Salvioli-Mariani, E.* 
Pedron, D.* 
Cavallo, A.* 
Title“Nanogranite” and glassy inclusions: The anatectic melt in migmatites and granulites
Issue Date5-Oct-2009
Series/Report no.7/37 (2009)
DOI10.1130/G25759A.1
URIhttp://hdl.handle.net/2122/5881
KeywordsNanogranite and glassy inclusions, anatectic melt
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocks 
AbstractUsing as a case study a granulite from the Kerala Khondalite Belt, India, we show that a former anatectic melt can be preserved as tiny (<25 μm) droplets within refractory minerals,in this case garnet. The melt is either fully crystallized as a Qtz-Ab-Kfs-Bt cryptocrystalline aggregate (“nanogranite”), or completely glassy in inclusions <15 μm. Both nanogranite and glassy inclusions have a peraluminous, ultrapotassic granitic composition that, in this case, does not correspond to a “minimum melt” and points to high melting temperatures, in agreement with the ultrahigh-temperature origin of the rock. This discovery indicates that peritectic minerals, growing during incongruent melting reactions, act as hosts for inclusions of anatectic melt, and that in the general case of slow cooling of the crust these inclusions will occur as nanogranite. Exceptionally, in the smallest inclusions, glass may be present due to inhibition of crystallization. Our results extend the frontiers of petrological and geochemical research in crustal melting, as the composition of natural anatectic melts can be directly analyzed rather than assumed.
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