Authors:Anita Jávor, Zuárd Ditrói-Puskás, and Gábor Dobosi
The newly discovered
crustal xenoliths from Miocene andesites in the Mátra Mts (Northeast Hungary)
were classified into three petrographic types. Type 1 is a garnetiferous,
plagioclase-rich cumulate rock, presumed to originate from the felsic portion
of the nearby Szarvaskõ-Darnó mafic igneous complex. The almandine-rich
garnet has been inferred to be of granulite facies origin. Garnet -
orthopyroxene geothermobarometry on the orthopyroxene - plagioclase corona
structure around it indicates a later high temperature (800-950 °C) low
pressure (3-4 kbar) retrogression event. Type 2 is also plagioclase-rich
cumulate rock with contact metamorphic assemblage containing spinel, corundum
and andalusite, which crystallized in the course of dehydration reactions of
biotite and/or smectite in hornblende hornfels to sanidinite facies conditions.
Type 3 is microsyenite, which contains abundant anorthoclase and minor amount
of Na- and K-rich kaersutitic-barkevikitic amphibole.
Authors:Ágnes Skultéti, Tivadar M. Tóth, István János Kovács, Edit Király, and Judit Sándorné Kovács
dehydrated. In regions where quartz was not as intensively deformed (away from the shear zone), the water content (OH − , H 2 O) of the grains has been preserved.
Results of fracturing tests performed on quartz ( Doukhan 1995 ; Kornev and
Authors:Máté Zsigmond Leskó, Richárd Zoltán Papp, Boglárka Anna Topa, Ferenc Kristály, Tamás Vigh, and Norbert Zajzon
be identified because the drilling was stopped after reaching the footwall and only a few meters of Pliensbachian limestone/marl were collected. The chemical composition of the material was measured with SEM-EDS on dehydrated materials (after 550 °C
Authors:Zsófia Pálos, István János Kovács, Dávid Karátson, Tamás Biró, Judit Sándorné Kovács, Éva Bertalan, Anikó Besnyi, György Falus, Tamás Fancsik, Martina Tribus, László Előd Aradi, Csaba Szabó, and Viktor Wesztergom
; Lloyd et al. 2016 ).
NAMs, however, can lose their representative pre-eruptive water contents through diffusional dehydration caused by hot emplacement and slow cooling of lava and tephra ( Lloyd et al. 2016 ; Biró et al. 2016 , 2017
breakdown of mica. Along the prograde path, kyanite porphyroblasts are produced by muscovite dehydration melting reaction, and at even higher temperatures, biotite dehydration melting consumes these kyanite blasts. Following the metamorphic peak, new