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.

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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.

Caracterizacion petrografica, geoquimica y geocronologia de rocas granitoides permicas al occidente de La Plata y Pacarni--Huila, Valle Superior del Magdalena--Colombia

2010): Leucogranito Pumayaco: anatexis cortical durante el ciclo orogenico Famatiniano en el extremo norte de la Sierra de Molinos, provincia de Salta.

The Sierra de Cachi (Salta, NW Argentina): geological evidence about a Famatinian retro-arc at mid crustal levels

2001, Formation of diatexite migmatite and granite magma during anatexis of semi-pelitic metase-dimentary rocks: an example from St.

Geochemical constraints of origin and evolution of migmatites in the central part of the Moldanubian Zone (Temelin area), Bohemian Massif

1994) also suggested that the Nagar Parkar granite rocks are the product of crustal anatexis in an intraplate (continental) anorogenic environment.

An appraisal of uranium source potential of granites, associated felsic rocks, kaolin and calcretes of Nagar Parkar area, Tharparkar Pakistan

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).

Igneous rock associations 8. Arc magmatism II: geochemical and isotopic characteristics

High mobility of melt during crustal anatexis becomes evident from the internal structure of leucosomes (Mengel et al.

An analogue model of melt segregation and accumulation processes in the Earth's crust/Maakoore osalise ulessulamise protsesside modelleerimine analoogmaterjalide abil

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.

Condiciones P-T de metamorfismo de riolitas del Jurasico Superior en el cinturon de pliegues y mantos de Magallanes, Andes Patagonicos, Chile

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.

Emplacement of the Fogo Island Batholith, Newfoundland

Some of the pegmatites are probably the result of anatexis of the basement rocks, formed by metamorphic secretion, diffusion and replacement (Haughton, 1969).

Jeremejevite from Namibia

It was clearly a widespread phenomenon related to crustal thinning with anatexis.

El permico inferior de Valdeviar (Sevilla), SW de Espana: geologia historica de la cuenca e implicaciones climaticas y paleogeograficas

Arcs under extension have a steep geothermal gradient and underplating of the crust by mafic magma may transfer sufficient heat to induce anatexis.

Igneous Rock Associations 7. Arc magmatism I: relationship between subduction and magma genesis

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.

Laser-Ablation Split-Stream Petrochronology of Kangmar and Mabja North Himalayan Gneiss Domes