Fluid-Absent Melting Behavior of a Two-Mica Metapelite: Experimental Constraints on the Origin of Black Hills Granite

Generation and emplacement of shear-related highly mobile crustal melts: the synkinematic leucogranites from the Variscan Tormes Dome, Western Spain

“…Using major element least-square modeling (e.g., Chayes 1968;Bryan et al 1969;Albarède and Provost 1977;Nabelek and Bartlett 1998;Ortega Cuesta 1998;Villaseca et al 1999) and the mineralogical composition of the residue as inferred from the geochemistry, different combinations of protoliths and residuum were modeled. The composition of the residual minerals was constrained using migmatitic pelites and orthogneisses of the Tormes Dome (Gil Ibarguchi and Martinez 1982;Escuder Viruete 1999;Escuder Viruete et al 2000), experimental work involving augen gneisses (Holtz and Johannes 1991;Castro et al 2000), and metapelites/metagreywackes (Vielzeuf and Holloway 1988;Le Breton and Thompson 1988;Patiño Douce et al 1993;Patiño Douce and Beard 1996;Montel and Vielzeuf 1997;Patiño Douce and Harris 1998;Pickering and Johnston 1998). Whether entrained metapelitic xenoliths have a significant influence on the modeling of partial melting was estimated by subtracting variable amounts of metasedimentary material from the whole-rock composition of the leucogranite.…”

“…In the first case, leucogranites are formed in the middle crust from fertile metapelites (e.g., Le Breton and Thompson 1988;Vielzeuf and Holloway 1988;Patiño Douce and Johnston 1991;Pickering and Johnston 1998), metagreywackes (e.g., Patiño Douce and Beard 1996; Montel and Vielzeuf 1997), or biotite-muscovite gneisses (Holtz and Johannes 1991;Castro et al 2000). Most anatectic leucogranites are related to extensional structures that cause decompression melting driven by the breakdown of mica.…”

Experimental anatexis, fluorine geochemistry and lead-isotope constraints on granite petrogenesis in the Seridó Belt, Borborema Province, northeastern Brazil

“…1993; Pickering and Johnston, 1998), but they preserve low-F domains (Table 7). Plagioclase grains were retained within all of the fluid-absent experiments despite their instability (e.g., Johannes and Koepke, 2001).…”

“…Over the past 30 years, field, theoretical and experimental efforts have firmly linked the generation of felsic rocks to crustal anatexis (e.g., Fyfe, 1973;Thompson, 1982;Clemens and Vielzeuf, 1987;Walker et al, 1989;Harris and Inger, 1992;Nabelek et al, 1992;Shearer et al, 1992;Krogstad et al, 1993;Patiño Douce, 1995;Thompson and Connolly, 1995;Clemens and Droop, 1998;Pickering and Johnston, 1998;Sawyer, 1998;Harris et al, 2000;London, 2005;Castro, 2013). While the fluid-absent melting of micas and amphibole is considered by many petrologists to be the main process for generating H 2 O-undersaturated felsic liquids (e.g., Clemens and Vielzeuf, 1987;Le Breton and Thompson, 1988;Vielzeuf and Holloway, 1988;Johnston, 1993, 1996;Patiño Douce, 1995;Patiño Douce and Beard, 1995;Montel and Vielzeuf, 1997;Stevens et al, 1997;Castro et al, 2000;Nair and Chacko, 2002), numerous geochemical and phase stability assessments suggest that melting may also involve H 2 O-fluxed reactions (Wickham, 1987;McLellan, 1988;Yardley and Barber, 1991;Mogk, 1992;Jung et al, 2000;Barnes et al, 2002;Slagstadt et al, 2005;Acosta-Vigil et al, 2006;Ward et al, 2008;Genier et al, 2008;Berger et al, 2008;…”

Geochemistry of the Mamil Choique granitoids at Rio Chico, Río Negro, Argentina: Late Paleozoic crustal melting in the North Patagonian Massif

“…(Data for mafic sources Rushmer, 1991;Rapp et al, 1991;Rapp, 1995;Springer and Seck, 1997;Skjerlie and Patiñ o Douce, 2002; quartz-feldspar biotite-bearing rocks Le Breton and Thompson, 1988;Vielzeuf and Holloway, 1988;Holtz and Johannes, 1991;Patiñ o Douce and Johnston, 1991;Johnston, 1992, 1996;Gardien et al, 1995;Beard, 1995, 1996;Patiñ o Douce, 1996;Singh and Johannes, 1996;Montel and Vielzeuf, 1997;Pickering and Johnston, 1998;Gardien et al, 2000). Symbols as in Fig.…”