By Nick Petford, John D. Clemens, Jean-Louis Vigneresse (auth.), J. L. Bouchez, D. H. W. Hutton, W. E. Stephens (eds.)
viii debate of these previous days has been fantastically summarized by way of H. H. learn in his recognized "Granite Controversy" (1957). Read's formula of the debate happened on the time whilst geochemistry used to be as a brand new and robust device. the recent thoughts opened period within which rising an granites have been thought of customarily from this new perspective. Geochemical signatures have proven that mantle and crustal origins for granites have been either attainable, however the debate on how and why granites are emplaced didn't growth a lot. in the meantime, structural geology was once primarily geometrical and mechanistic. within the early 70's, the structural technique started to widen to incorporate sturdy kingdom physics and fluid dynamics. specified structural maps of granitic our bodies have been back released, typically in France, and analysed by way of magmatic and plastic circulate. The senior editor of this quantity and his scholars deserve a lot of the credits for this new improvement. through microstructural and petrofabric stories, they have been in a position to discriminate among pressure within the presence of residual soften or within the solid-state, and, via systematically measuring magnetic materials (AMS), they've been capable of map magmatic foliations and lineations in ever finer element, utilizing the interior markers inside granites coming from varied tectonic environments. the normal debate has been shifted anew. The burning query now appears how the mandatory, large-scale or neighborhood, crustal extension required for granite emplacement should be obtained.
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Additional resources for Granite: From Segregation of Melt to Emplacement Fabrics
8 1050 54° 6 'Mineral symbols: qtz, quartz; an, anorthite; pi, plagioclase; sa, sanidine; alkf, alkali feldspar; hbl, hornblende; amp, amphibole; bt, biotite. Sip8; an: CaAI 2Sit08 ), followed, in parentheses, by the water content in melt (in wt %; "sat" stands or water saturation). •References: 1, Jurewicz and Watson, 1984; 2, Jurewicz and Watson, 1985; 3, Laporte, 1994; 4, Holness, 1995 (many data from ref. , 1988; 7, Longhi and Jurewicz, 1995; 8, Laporte and Watson, 1995; 9, Lupulescu and Watson, 1994, 1995; QAn22c, QOrH2: this study.
2d. 5 to NN0+2, then, in order to reequilibrate, the crystaVmelt ratio of the magma must also shift, because this parameter depends on f02. If oxidation occurs with no gain or loss of Hp, magma viscosity after oxidation at the same temperature will be identical to that for the magma that crystallized under oxidized conditions. % at NN0+2. However, as shown on Fig. %) cancel each other. On the other hand, an entirely different result is obtained for a system where the total H20 content of the melt may vary.
This value was computed from the wetting angle in column no. 2, with the 38 D. LAPORTE et al. assumption that the solid-fluid system behaves ideally (the relationship between C/Jc and ()in an ideal system is shown in figure 2). Most measurements in Table 1 were obtained by diffusion experiments. g. Watson, 1991). The transition from isolated fluid pockets to a continuous network of fluid-filled channels at C/Jc should therefore correspond to a dramatic increase of bulk-rock diffusion coefficient, as observed by Watson and Lupulescu (1993) in a series of diffusion experiments in water-bearing clino-pyroxenites at 1500 MPa and 950 oc.
Granite: From Segregation of Melt to Emplacement Fabrics by Nick Petford, John D. Clemens, Jean-Louis Vigneresse (auth.), J. L. Bouchez, D. H. W. Hutton, W. E. Stephens (eds.)