Dear All,
I am a PhD student working on high-grade metamorphic rocks from the variscan
chain of Sardinia, Italy. Amphibole migmatites from Sardinia consist of
homogeneous mesosome and two types of leucosomes: tonalitic and
granodioritic-granitic leucosomes.
Mesosomes are tonalitic, medium-grained, foliated rocks, made up of quartz,
plagioclase, biotite, ± amphibole, ± garnet.
The tonalitic leucosomes are granoblastic, poorly foliated,
amphibole-bearing patchy leucosomes. They are made up of quartz,
plagioclase, biotite, ± amphibole and ± garnet.
The granodioritic-granitic leucosomes consist of quartz, plagioclase,
K-feldspar, biotite, ± garnet. No amphibole is present in these leucosomes
and quartz, plagioclase, and K-feldspar are the most abundant minerals. No
crosscutting relations have been observed between the two leucosome types.
Can somebody suggest a possible genesis for the different types of
leucosomes or some recent papers about similar topics ?
Thanks in advance
Gabriele Cruciani
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