Hello to everyone:
I'm Manuel and new in the list. I'm a PhD student working on regional
metamorphism and variscan deformation in the Iberian Massif. Part of my
investigation deals with prograde metamorphism of an amphibolitic unit.
Amphiboles from the highest zone (with Cpx) are Mg-Hornblende. As we move
towards lower grade zones, amphibole composition widens towards both
actinolite and pargasite, which seems quite extrange. Amphibole crystals
from this zone appear with a patchy zonation (Act-Hbl-Prg) which suggest
they're in equilibrium. Is it possible to get this type of texture and
Pargasite composition with decrease in metamorphic grade? I've been looking
in the literature and haven't found a case like this. Does anyone know about
similar cases around the world? I will appreciate some help on this matter.
Thank you all in advance
--
Manuel Díaz Azpiroz
Dpto. Geología, Universidad de Huelva
Campus de La Rábida. Crtra. Palos de la Frontera s/n
21087 Huelva
Tf: 959-351000/351012
Fax: 959-530175
E-mail: [log in to unmask]
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