Results 61 to 70 of about 114 (105)
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Zircon Zr isotope fractionation during crustal anatexis
Science China Earth SciencesJames Van Orman
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Contrasting behaviour of boron during crustal anatexis
Lithos, 2001The study of volatile elements in crustal anatectic terranes may provide information about the role of fluid flow and fluid pathways during high temperature metamorphism. We have studied the distribution of Li and B in two migmatitic areas: the . Pena Negra Anatectic Complex central Spain and the migmatites and leucogranites associated with the Ronda ...
A Acosta-Vigil +3 more
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Crustal anatexis during the influx of mantle volatiles
Lithos, 1993Abstract Many data show that large masses of silicic magma can be formed by crustal anatexis under the influence of volatiles, possibly enriched in primary water derived from a mantle source. In the present paper, a model of crustal anatexis, accompanied by a limited influx of volatiles is suggested.
B.A. Litvinovsky, Yu.Yu. Podladchikov
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The Cooma Granodiorite, Australia: An example of in situ crustal anatexis?
Geology, 1978Data suggesting that the Cooma Granodiorite, New South Wales, Australia, originated by essentially in situ anatexis of adjacent metasedimentary rocks are in apparent conflict with the low-pressure metamorphic environment, unless unrealistically high and localized geothermal gradients (about 55 °C/km) are invoked.
R. H. Flood, R. H. Vernon
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Dating crustal anatexis in UHT granulites with Lu-Hf
2020<p>Ultra-high temperature (UHT) metamorphism is a thermal regime that can be attained by the lower continental crust in exceptional contexts and that is usually accompanied by fluid-absent dehydration melting. Such conditions are observed in the Gruf Complex, a 12 x 10 km migmatitic body located in the Central Alps, which is ...
Omar Gianola +4 more
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Crustal anatexis: An experimental review
Tectonophysics, 1977Review of experimental studies in synthetic systems An—Ab—Or—Qz—H_2O and K_2O—Al_2O_3—SiO_2—H_2O illustrates the dominance of feldspar—quartz assemblages in crustal anatectic processes, and the role of hydrous minerals such as muscovite. H_2O-undersaturated liquids can exist with quartz—feldspar assemblages through hundreds of degrees with little ...
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The garnet effect on hafnium isotope compositions of granitoids during crustal anatexis
Geology, 2023AbstractRadiogenic Hf isotope disequilibrium during crustal anatexis complicates petrogenetic studies that link sources to sinks in granitoid systems and hinders the applications of Hf isotopes to evaluating long-term crustal growth and evolution. Garnet can be a dominant host of radiogenic Hf in crustal rocks, and its behavior in granitoid sources may
Long Chen +8 more
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The behavior of apatite during crustal anatexis: Equilibrium and kinetic considerations
Geochimica et Cosmochimica Acta, 1984The solubility and dissolution kinetics of apatite in felsic melts at 850°–1500°C have been examined experimentally by allowing apatite crystals to partially dissolve into apatite-undersaturated melts containing 0–10 wt% water. Analysis of P and Ca gradients in the crystal/melt interfacial region enables determination of both the diffusivities and the ...
T.Mark Harrison, E.Bruce Watson
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The production of granitic magmas through crustal anatexis at convergent plate boundaries
Lithos, 2021Abstract Granite petrogenesis is associated with the formation and evolution of continental crust along convergent plate boundaries. While magmatic processes such as partial melting and fractional crystallization result in the compositional diversity of granites, the nature of magma sources is related to tectonic settings of granite generation ...
Yong-Fei Zheng, Peng Gao
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The Timing of Yellowknife Gold Mineralization: A Temporal Relationship with Crustal Anatexis?
Economic Geology, 2011In order to thoroughly evaluate the genesis of orogenic gold mineralization in the context of plate tectonics, absolute age data are required to link mineralization with lithological evolution. We show that pyrite, associated with orogenic gold mineralization from the Con deposit in the ca. 2700 Ma Yellowknife greenstone belt, has an Re-Os isochron age
L. Ootes +5 more
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