Results 211 to 220 of about 7,051 (253)
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The isocon diagram; a simple solution to Gresens' equation for metasomatic alteration
Economic Geology, 1986Gresens' (1967) method of analysis of changes in volume and concentrations during metasomatism have been applied in many studies of hydrothermal alteration. This paper provides a simple method of solution of Gresens' equations, for both volume (or mass) change and concentration changes, one which requires no significant manipulation of analytical data ...
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Geochemistry International, 2012
The paper addresses the composition and genesis of endogenous borates from hypabyssal skarn deposits of Japan (Honshu Island) that were formed after dolomitic, rhodochrosite, and calcareous marbles in the contact aureoles of magmatic intrusions of diverse felsicity (from granites to diorite-monzonites).
S. M. Aleksandrov, M. A. Troneva
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The paper addresses the composition and genesis of endogenous borates from hypabyssal skarn deposits of Japan (Honshu Island) that were formed after dolomitic, rhodochrosite, and calcareous marbles in the contact aureoles of magmatic intrusions of diverse felsicity (from granites to diorite-monzonites).
S. M. Aleksandrov, M. A. Troneva
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Lithos, 2000
Abstract The Olary Domain, part of the Curnamona Province, a major Proterozoic terrane located within eastern South Australia and western New South Wales, Australia, is an excellent example of geological region that has been significantly altered by metasomatic mass-transfer processes associated with regional metamorphism. Examples of metasomatically
Adam J R Kent, C Mark Fanning
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Abstract The Olary Domain, part of the Curnamona Province, a major Proterozoic terrane located within eastern South Australia and western New South Wales, Australia, is an excellent example of geological region that has been significantly altered by metasomatic mass-transfer processes associated with regional metamorphism. Examples of metasomatically
Adam J R Kent, C Mark Fanning
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Chemical Geology, 2014
Abstract In the subduction-related Catalina Schist, reaction zones or ‘rinds’ developed at contacts of metamorphosed mafic blocks with chemically distinct melange matrix. These rinds exhibit complex chemical compositions that defy simple, single-process explanations.
Sarah C. Penniston-Dorland +4 more
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Abstract In the subduction-related Catalina Schist, reaction zones or ‘rinds’ developed at contacts of metamorphosed mafic blocks with chemically distinct melange matrix. These rinds exhibit complex chemical compositions that defy simple, single-process explanations.
Sarah C. Penniston-Dorland +4 more
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Contributions to Mineralogy and Petrology, 1994
Dolerite dykes that cut Tertiary baslats near the Skaergaard intrusion, East Greenland, are extensively altered to metasomatic assemblages indicating large scale mobilisation of calcium and alkalis. The alteration is characterised by replacement of the dolerite by prehnite together with lesser amounts of epidote, amphibole, salite, titanite, calcite ...
Rose, N.M., Bird, D.K.
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Dolerite dykes that cut Tertiary baslats near the Skaergaard intrusion, East Greenland, are extensively altered to metasomatic assemblages indicating large scale mobilisation of calcium and alkalis. The alteration is characterised by replacement of the dolerite by prehnite together with lesser amounts of epidote, amphibole, salite, titanite, calcite ...
Rose, N.M., Bird, D.K.
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International Geology Review, 1967
This study is concerned with formation of minerals containing Li, Be, Cb, Ta, W, Bi, and other elements. The distribution of 35 accessory minerals was examined in biotite granite massifs occupying an area of 10 km2 . These minerals formed during the late magmatic stage and mainly during the subsequent metasomatic processes, such as rnuscovitization ...
L.F. Syritso, L.N. Chernik
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This study is concerned with formation of minerals containing Li, Be, Cb, Ta, W, Bi, and other elements. The distribution of 35 accessory minerals was examined in biotite granite massifs occupying an area of 10 km2 . These minerals formed during the late magmatic stage and mainly during the subsequent metasomatic processes, such as rnuscovitization ...
L.F. Syritso, L.N. Chernik
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International Geology Review, 1961
Different forms of high-temperature alkaline autometasofnatism in granitoids of certain tin bearing Trnansifs in the upper course basin of the Kolyma River are considered.' The relative depths of massif, deVelopment have been established from the degree of erosional shearing, higher in massifs enclosed in anticlinal structures. In massifs develoried at
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Different forms of high-temperature alkaline autometasofnatism in granitoids of certain tin bearing Trnansifs in the upper course basin of the Kolyma River are considered.' The relative depths of massif, deVelopment have been established from the degree of erosional shearing, higher in massifs enclosed in anticlinal structures. In massifs develoried at
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Composition and volume changes accompanying soda metasomatic alterations, Västervik Area, SE Sweden
Geologische Rundschau, 1978Applying a set of equations derived byGresens (1967), composition-volume relationship are discussed for pairs of soda metasomatites and unaltered enclosing country rocks. A probable volume factor is inferred and the behaviour of elements interpreted. The metasomatic alteration was basically a process of leaching in which two stages can be recognized ...
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2012
Heat-liberating events, such as igneous intrusions emplaced into cool crustal rocks, will result not only in loss of heat to the surrounding environment, but also in the transport of volatile components, which are responsible for metasomatic processes.
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Heat-liberating events, such as igneous intrusions emplaced into cool crustal rocks, will result not only in loss of heat to the surrounding environment, but also in the transport of volatile components, which are responsible for metasomatic processes.
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Geological Magazine, 1929
In Teesdale and Weardale, at all exposures that have been examined, the Whin Sill is cut by a system of approximately vertical, sweeping, joint planes. These are distinct in general character from, and are on a larger scale than, the columnar jointing which is conspicuous in all vertical scars of Whin Sill. The pattern of the larger scale jointing on a
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In Teesdale and Weardale, at all exposures that have been examined, the Whin Sill is cut by a system of approximately vertical, sweeping, joint planes. These are distinct in general character from, and are on a larger scale than, the columnar jointing which is conspicuous in all vertical scars of Whin Sill. The pattern of the larger scale jointing on a
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