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 ?
Rodriguez (1995a) clasifico las rocas del Ortogranito de La Plata (Macizo de La Plata) como monzogranitos de anatexis, gneises migmatiticos de cuarzo-plagioclasa-hornblenda con microclina y biotita, granulitas cuarzo-feldespaticas con ortopiroxeno, clinopiroxeno y hornblenda; predominando los monzogranitos y los gneises migmatiticos.
2010): Leucogranito Pumayaco: anatexis cortical durante el ciclo orogenico Famatiniano en el extremo norte de la Sierra de Molinos, provincia de Salta.
2001, Formation of diatexite migmatite and granite magma during anatexis of semi-pelitic metase-dimentary rocks: an example from St.
1994) also suggested that the Nagar Parkar granite rocks are the product of crustal anatexis in an intraplate (continental) anorogenic environment.
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).
High mobility of melt during crustal anatexis becomes evident from the internal structure of leucosomes (Mengel et al.
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).
Arcs under extension have a steep geothermal gradient and underplating of the crust by mafic magma may transfer sufficient heat to induce anatexis.
Zhang, 2011, Contribution of crustal anatexis to the tectonic evolution of Indian crust beneath southern Tibet, Geological Society of America Bulletin, 123 (1-2), 218-239.