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81.
Comparison of mass transfer patterns, geometry and microstructures developed within and around veins allows the interpretation of processes of fluid flow during deformation, metamorphism and mineralization. A classification of vein types based on the degree of interaction with wallrock (using petrological, geochemical or isotopic indicators) can be used to identify a range of processes, from closed system behaviour in which the vein mass is derived from local wallrock, through to open system behaviour in which the vein mass is derived externally. Microstructural characteristics, such as wallrock selvages, multiple growth events recorded by vein seams and vein crystal morphology, also help to constrain mass transfer patterns during vein formation. We present a range of processes for vein formation, including: (i) the formation of closed system fibrous veins by dissolution–precipitation creep, including varieties in which tensile failure is not required; (ii) pressure‐ or kinetically dependent closed system segregation veins in which transfer of soluble components from wallrock to vein leaves behind a residual selvage; (iii) similar vein–selvage patterning, but with mass imbalances between vein and wallrock requiring fluid advection through both interconnected fracture networks and in the surrounding permeable rock; and (iv) the proposed formation of veins by fluid ascent in mobile hydrofractures, in which isotopic or chemical disequilibrium within and around the vein suggests that the crack and fluid within it moved essentially as one. The postulate of rapid fluid and mass transfer via such mobile hydrofractures has implications for the release of volatiles from metamorphic terrains. Also, consideration of a broad range of possible vein‐forming mechanisms is highly desirable when dealing with mineral deposits found in deformed, metamorphosed rocks, because closed system veining may produce patterns that, if erroneously recognized as being open systems, could lead to false interpretations of the role of tectonic fracturing in ore genesis. 相似文献
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Stuart Oliver 《Social & Cultural Geography》2013,14(3):313-321
The consideration of psychoanalytic issues presents geography and geographers with a number of difficulties; this paper examines those difficulties from within a humanistic perspective. The most common geographical engagements with the psychological therapies have been with their psychodynamic and, to a lesser extent, humanist methodological forms. A humanist perspective on this engagement suggests that it has led to two associated problems. At a disciplinary level it has resulted in an approach that has tended to privilege intellectual knowledge at the expense of emotion, and at a personal level it has not encouraged an approach that is sensitive to difference. This essay proposes that a commitment to an engaged, 'congruent' listening might help temper these difficulties. 相似文献
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Kathryn Oliver Mills 《Romance Quarterly》2013,60(3):177-185
For a total of twenty years (1856–76), Gustave Flaubert corresponded with a woman whom he would never meet and who had first written to him to express her admiration for his novel, Madame Bovary. These forty-five letters are among the most fascinating and important that he was to write, reflecting on his life, on art and esthetics, and on his determined dedication to the practice of writing. The letters to Marie-Sophie Leroyer de Chantepie occupy a central role in Flaubert's Correspondence, between the long series of letters he wrote to two other women, Louise Colet and George Sand. They are all dominated by the idea of the centrality of art, literature, and the activity of writing, and of the subordinate status of all other experiences and interests. 相似文献
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Oliver Logan 《Modern Italy》2013,18(2):237-247
The modern popular cult of the Pope, which originated with the ‘disinherited’ papacy of Pius IX, reached its acme with Pius XII. Phases of intensification of this cult, which was linked to other ‘devotions’, those of the Sacred Heart of Jesus and of the Virgin Mary, served to mobilize the Catholic masses at critical junctures for the Catholic Church and in the face of what were perceived as political threats. Pius XII had to animate ‘movement’ in an age proclaimed to be one of a unique crisis of civilization. The projection of him as a charismatic figure was linked to that of Rome as a sacred centre and as the very fulcrum of world history. The Catholic activist ethos of ‘movement’ and also the presentation of the interchange between Pius XII and the Crowd had features in common with Fascist rhetorics, but ultimately the cult of the ‘victim‐Pope’ represented an inversion of the crasser forms of power‐imagery. 相似文献
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Geography, Spatial Data Analysis, and Geostatistics: An Overview 总被引:1,自引:0,他引:1
Geostatistics is a distinctive methodology within the field of spatial statistics. In the past, it has been linked to particular problems (e.g., spatial interpolation by kriging) and types of spatial data (attributes defined on continuous space). It has been used more by physical than human geographers because of the nature of their types of data. The approach taken by geostatisticians has several features that distinguish it from the methods typically used by human geographers for analyzing spatial variation associated with regional data, and we discuss these. Geostatisticians attach much importance to estimating and modeling the variogram to explore and analyze spatial variation because of the insight it provides. This article identifies the benefits of geostatistics, reviews its uses, and examines some of the recent developments that make it valuable for the analysis of data on areal supports across a wide range of problems. 相似文献