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Granite : From Segregation of Melt to Emplacement Fabrics - Jean-Luc Bouchez

Granite

From Segregation of Melt to Emplacement Fabrics

By: Jean-Luc Bouchez (Editor), D. Hutton (Editor), W. E. Stephens (Editor)

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Published: 31st March 1997
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viii debate of those earlier days has been beautifully summarized by H. H. Read in his famous "Granite Controversy" (1957). Read's formulation of the controversy occurred at the time when geochemistry was as a new and powerful tool. The new techniques opened era during which emerging an granites were considered mainly from this new viewpoint. Geochemical signatures have shown that mantle and crustal origins for granites were both possible, but the debate on how and why granites are emplaced did not progress much. Meanwhile, structural geology was essentially geometrical and mechanistic. In the early 70's, the structural approach began to widen to include solid state physics and fluid dynamics. Detailed structural maps of granitic bodies were again published, mainly in France, and analysed in terms of magmatic and plastic flow. The senior editor of this volume and his students deserve much of the credit for this new development. Via microstructural and petrofabric studies, they were able to discriminate between strain in the presence of residual melt or in the solid-state, and, by systematically measuring magnetic fabrics (AMS), they have been able to map magmatic foliations and lineations in ever finer detail, using the internal markers within granites coming from different tectonic environments. The traditional debate has been shifted anew. The burning question now seems to be how the necessary, large-scale or local, crustal extension required for granite emplacement can be obtained.

Preface
Introduction
Application of information theory to the formation of granitic rocksp. 3
Rheological properties of granitic magmas in their crystallization rangep. 11
Wetting angles, equilibrium melt geometry, and the permeability threshold of partially molten crustal protolithsp. 31
Magmatic fracturing and small-scale melt segregation during pluton emplacement: evidence from the Adamello massif (Italy)p. 55
Rheological aspects of magma transport inferred from rock structuresp. 75
Granite is never isotropic: an introduction to AMS studies of granitic rocksp. 95
Homogeneity of granite fabrics at the metre and dekametre scalesp. 113
Analogue 3D simple-shear experiments of magmatic biotite subfabricsp. 129
3D biotite shape fabric experiments under simple shear strainp. 145
Perpendicular linear fabrics in granite: markers of combined simple shear and pure shear flows?p. 159
Rigid particles in simple shear flow: is their preferred orientation periodic or steady-state?p. 177
Syntectonic granites and the principle of effective stress: a general solution to the space problem?p. 189
Granite pluton geometry and emplacement mode inferred from combined fabric and gravity datap. 199
The Los Pedroches Batholith (Southern Spain): polyphase interplay between shear zones in transtension and setting of granitesp. 215
Development of magmatic to solid-state fabrics during syntectonic emplacement of the Mono Creek granite, Sierra Nevada Batholithp. 231
Drainage and emplacement of magmas along an inclined transcurrent shear zone: petrophysical evidence from a granite-charnockite pluton (Rahama, Nigeria)p. 253
Transcurrent shear zones and magma emplacement in Neoproterozoic belts of Brazilp. 275
Oblique diapirism of the Yakushima granite in the Ryukyu arc, Japanp. 295
Experimental pluton shapes and tracks above subduction zonesp. 319
Bibliographyp. 335
Subject Indexp. 357
Table of Contents provided by Blackwell. All Rights Reserved.

ISBN: 9780792344605
ISBN-10: 079234460X
Series: Petrology and Structural Geology, V. 8
Audience: Professional
Format: Hardcover
Language: English
Number Of Pages: 358
Published: 31st March 1997
Publisher: Springer
Country of Publication: NL
Dimensions (cm): 25.4 x 17.15  x 1.91
Weight (kg): 0.79