Melt Generation in the Continental Crust: Answered and Unanswered Questions

A. E. Patiño Douce
1994 Mineralogical magazine  
A comparison of results of experimental studies of the melting behavior of crustal rocks to numerical models of the thermal structure of the continental ernst ( Fig. 1) suggests that Al-rich metamorphic rocks ('metapelites') can undergo extensive melting (20 to 60 %) during episodes of crustal thickening, even in the absence of intrusion of hot basaltic liquids. Under the same conditions, other metamorphic lithologies, such as orthogneisses and metabasalts, would generate melt fractions well
more » ... t fractions well below 20 % or even remain below their solidi. Similarities between common types of silicic igneous rocks and melts generated experimentally from crustal lithologies are limited (Fig. 2) . The strongly peraluminous, potassic and Ca-poor melts generated from biotite-rich protoliths are Dehydration-melting at 10 kbu go PHI 60 ET ~ ~
doi:10.1180/minmag.1994.58a.2.98 fatcat:v4rei3zktbewxgnevab6ho7shy