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Migmatite is a composite rock found in medium and high-grade metamorphic environments, commonly within Precambrian cratonic blocks. It consists of two or more constituents often layered repetitively: one layer is an older metamorphic rock that was reconstituted subsequently by partial melting ("paleosome"), while the alternate layer has a ...
Migmatite is a gneiss consisting of two or more distinct rock types, one of which has the appearance of an ordinary gneiss (the mesosome), and another of which has the appearance of an intrusive rock such pegmatite, aplite, or granite (the leucosome). The rock may also contain a melanosome of mafic rock complementary to the leucosome. [11]
Migmatite featuring felsic minerals, at Morton Gneiss Complex. Granitization is an old, and largely discounted, hypothesis that granite is formed in place through extreme metasomatism. The idea behind granitization was that fluids would supposedly bring in elements such as potassium, and remove others, such as calcium, to transform a ...
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The Piedmont geologic region is composed of igneous and metamorphic rocks that include schist, amphibolite, gneiss, migmatite, and granite, among others. [5] This region is more hilly than mountainous and is marked by lower elevations than the physiographic Blue Ridge.
The oldest Peninsular Gneiss found in areas in the Hosur – Gorur – Holenarsipur – Hunsur belt 3.3–3.2 Ga. The second generation Peninsular Gneiss found in the Bengaluru– Chickmagalur –Holenarsipur region 3.0–2.9 Ga a) Grandiorite facies in the Bengaluru Gneisses established by the Single Zircon Kober evaporation 207 Pb/ 206 Pb data.
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