Pictorial 5: Concentration and Migration of Melt (Leucosome) Occurred in Migmatites
نویسندگان
چکیده
منابع مشابه
Topology of syntectonic melt-flow networks in the deep crust: Inferences from three- dimensional images of leucosome geometry in migmatites
One of the fundamental geophysical observations made of the Earth is the stratified nature of the continental crust, in which the lower crust comprises denser, more mafic material and the upper crust comprises less dense, more felsic material. This chemically differentiated layered structure is developed and maintained by partial melting at depth and the ascent of magma to shallower crustal lev...
متن کاملInvestigation of melt distribution reactions, thermobarometry and minerals chemistry of amphibols and plagioclase leucosome, melanosome and mesosome in Takab Hornblend bearing migmatites, northwestern Iran
The process of migmatitization in the Ghareh Naz has resulted in the formation of various rate of partial melting and eventually the formation of a large spectrum of metatexite and diatexite migmatites. Mineral chemistry studies by EPMA method shows that amphibole composition is magnesio-hastingsite and has a metamorphic origin and feldspar composition is andesine to oligoclase. Effective react...
متن کاملCompaction-driven melt segregation in migmatites
A common and puzzling feature of migmatite terranes is the presence of synkinematic leucosomes oriented perpendicular to the maximum principal compressive stress axis, s1, particularly leucosomes oriented parallel to the axial plane of folds. These are parallel to planes of compaction, but experiments predict that leucosomes should form in dilational bands oriented instead at small angles to s1...
متن کاملNature of the Archean midcrust in the core of the Vredefort Dome, Central Kaapvaal Craton, South Africa
Extreme uplift associated with the formation of the 2.02 Ga Vredefort dome has exposed a substantial cross section through the crystalline early Archean basement complex rocks of the Kaapvaal craton. The rocks comprise polydeformed high-grade tonalite–trondhjemite–granodiorite (TTG) gneisses, migmatites and late-tectonic intrusive granitoids that straddle the upper amphibolite-to granulite–faci...
متن کاملبررسی سنگ‌نگاری پاراگنیس‌های شمال شرق گلپایگان: میگماتیتی شدن و شواهد دگرگونی پسرونده
The studied area, as Ykeh-Chah unit, is a part of Golpayegan magmatic and metamorphic complex in Sanandaj-Sirjan structural zone. The unit consists of mylonitized and high- grade metamorphic rocks, including biotite-gneiss, biotite-garnet-gneiss, amphibolite and orthogneiss. The biotite gneiss and the biotite garnet gneiss have partly been migmatitized. They show various structures such as stro...
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ژورنال
عنوان ژورنال: Journal of Geography (Chigaku Zasshi)
سال: 1997
ISSN: 0022-135X,1884-0884
DOI: 10.5026/jgeography.106.5_plate13