anatexis


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anatexis

[‚an·ə′tek·səs]
(geology)
A high-temperature process of metamorphosis by which plutonic rock in the lowest levels of the crust is melted and regenerated as a magma.
References in periodicals archive ?
(2001), asignan el nombre de Ortogranito de La Plata a las rocas metamorficas anteriormente nombradas Macizo de La Plata y define un area de exposicion de 50 [Km.sup.2] hacia el occidente del municipio de La Plata, constituida por granitoides cuarzo feldespaticos formados por ultra metamorfismo (anatexis), localmente con granulitas y migmatitas.
(2006): Controls on low-pressure anatexis. Journal of Metamorphic Geology 24, 107-118.
(3) The IAB magmatism led to the lower crustal anatexis of the OIA basement, consequently generating granitoids of arc affinities (ca.
According to the definition given by Brown (1973), diatexis is considered to be the process of high-grade anatexis in which fusion may be complete.
Procesos de anatexis pudieron haber acompanado el desarrollo de isogradas de alto grado (zona de la sillimanita), mientras que la fusion parcial de estas rocas metamorficas pudo ocurrir a temperaturas de aproximadamente 650[grados]C, en presencia de agua (trayectoria en color verde, FIGURA 15).
High mobility of melt during crustal anatexis becomes evident from the internal structure of leucosomes (Mengel et al.
Those formed by anatexis of older crust should have depleted mantle model ages that are significantly older than their crystallization age and those that reflect contamination or assimilation should plot on calculated mixing curves and should have a range in TDM ages between the end member components (DePaolo 1981a, b; Arndt and Goldstein 1987).
The igneous rocks are interpreted to be the product of crustal anatexis (Pankhurst and Rapela, 1995) which took place during widespread extensional events preceding the dismembering of the Pangea supercontinent and, thus, the opening of the Atlantic Ocean.
A model for emplacement of the batholith assumes crustal anatexis above mantle-derived, underplated mafic magma, followed by passive emplacement of composite magma along tensional fractures related to movements on the Dog Bay Line, a dextral terrane boundary.
Some of the pegmatites are probably the result of anatexis of the basement rocks, formed by metamorphic secretion, diffusion and replacement (Haughton, 1969).
(1994) proposed that the Nagar Parkar granite rocks are the product of crustal anatexis in an intraplate (continental) anorogenic environment.