Results 181 to 190 of about 2,459 (233)
Revisiting redox-driven pathways of tin cycle from source to economic deposit. [PDF]
Sci RepMichaud JA, Schmidt C, Naumova MA.
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Water availability controls crustal melting temperatures
Lithos, 2021Abstract Although the capacity for water to lower the solidus during crustal melting is well recognised, a modern consensus is that most granitic magmas are generated under fluid-absent melting conditions at temperatures ≥850 °C, and that water has little influence on crustal melting temperatures.
William Collins, J B Murphy
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Crustal melting by ponding of mafic magmas: A numerical model
Journal of Volcanology and Geothermal Research, 1998Abstract We examine the possibility that an abating period of mantle-related volcanic activity at continental margins triggers the production of crustal-derived melts. A vertical zone, permeated by rising mafic melts, is established below the volcanic arc if long-lasting mantle-derived magmatism occurs.
Laube, N., Springer, J.
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Crustal Melting and the Flow of Mountains [PDF]
Elements, 2011 As the continental crust thickens during mountain building, it can become hot enough to start melting, leading to a profound reduction in its strength. Melt-weakened crust can flow outward or upward in response to the pressure gradients associated with mountain building, and may be transported hundreds of kilometres laterally as mid-crustal channels ...
Jamieson, Rebecca +4 more
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High-temperature metamorphism and crustal melting: working with melt inclusions
Periodico di Mineralogia, 2015The application of melt inclusion (MI) studies to migmatitic and granulitic terranes is a recent, small-scale approach for a better understanding of melting in the continental crust. In order to show the role of anatectic MI in providing a wealth of microstructural and compositional information on high-temperature metamorphism and crustal anatexis, we ...
BARTOLI, OMAR +2 more
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Crustal rhyolite melts at mantle depths
2023Melts with rhyolite compositions originate from partial melting of crustal rocks or extensive differentiation of basaltic melts, at temperatures in the range of 800 °C. Accordingly, they are confined to the shallow continental crust. Nevertheless, experimental studies have demonstrated that dacite-rhyolite melts can be generated at higher ...
Dallai L. +7 more
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Lithos, 2014
Abstract Ascent of granitic melt initiates under suprasolidus conditions in the mid- to lower crust before continuing through subsolidus rocks to higher crustal levels. Whereas migration of melt in suprasolidus rocks can occur in pervasive net-like structures and involve relatively small melt volumes, ascent through the subsolidus crust requires more
Johann F.A. Diener +2 more
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Abstract Ascent of granitic melt initiates under suprasolidus conditions in the mid- to lower crust before continuing through subsolidus rocks to higher crustal levels. Whereas migration of melt in suprasolidus rocks can occur in pervasive net-like structures and involve relatively small melt volumes, ascent through the subsolidus crust requires more
Johann F.A. Diener +2 more
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Mechanisms of melt extraction during lower crustal partial melting
Journal of Metamorphic Geology, 2020AbstractProgressive vapour‐absent partial melting of a closed rock system increases melt pressure due to an expansion in the volume of the mineral plus melt assemblage. For a locally closed system, we quantify the melt pressure increase per increment of partial melting of a metapelite using phase equilibria modelling and combine it with Mohr–Coulomb ...
Michael A. Etheridge +3 more
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Geology, 2003
We propose that the internally zoned, Li-bearing Tin Mountain pegmatite in the Harney Peak granite-pegmatite system of the Black Hills, South Dakota, crystallized from fluid-rich, compositionally complex melts at ∼400–350 °C. The low crystallization temperatures resulted from the combined fluxing effects of Li, B, P, H 2 O, and carbonate anions.
Mona-Liza C. Sirbescu, Peter I. Nabelek
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We propose that the internally zoned, Li-bearing Tin Mountain pegmatite in the Harney Peak granite-pegmatite system of the Black Hills, South Dakota, crystallized from fluid-rich, compositionally complex melts at ∼400–350 °C. The low crystallization temperatures resulted from the combined fluxing effects of Li, B, P, H 2 O, and carbonate anions.
Mona-Liza C. Sirbescu, Peter I. Nabelek
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Partial melting of crustal rocks
Engineering Geology, 1989Abstract Shales and graywackes were first metamorphosed at 650°C and then partially melted at 700 and 750°C at 2, 4, 6, and 8 kilobars in the presence of 0.75m NaCl−0.45m KCl and 0.225m CaCl2−0.750m NaCl solutions. In experiments with shales,KK+Na ratio in the decreases with increasing pressure at 650 and 700°C; however, at 750°C this ratio is equal ...
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