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Granite Genesis - In-Situ Melting and Crustal Evolution

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ISBN-10: 140205890X

ISBN-13: 9781402058905

Edition: 2007

Authors: Guo-Neng Chen, Rodney Grapes

List price: $199.99
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Description:

Granitic rocks are a major component of the continental crust and the many and complex problems of their origin that have confronted geologists for over 200 years still are presenting challenges today. Current ideas of granite formation involve lower crustal melting, segregation, ascent (as dykes or diapirs) and emplacement in the upper crust. In this book we suggest an alternative model for the origin of granite in terms of in-situ melting-intracrustal convection that physically determines the process from partial melting of mid-upper crustal rocks to formation of a convecting magma layer. We illustrate the model using geological, geochemical and geophysical studies from Australia, North and South America, Europe and China, and conclude that heat convection within a crustal partial melt layer is essential for the formation of granite magma and that without convection, partial melting of rocks produces migmatites rather than granites. Granite is layer-like within the crust, and shape and size of granite bodies reflect the geometric relationship between an irregular upper surface of the crystallised magma layer and depth of erosion. Repeated melting of the crust generates downward-younging granite sequences. Chemical and isotopic compositions of granites indicate differentiation within the magma rather than different deep sources. Of a number of proposed heat sources that can cause mid-upper crustal anatexis, large-scale crustal melting and formation of a granite magma layer is considered to be primarily related to plate convergence. A dynamic model with examples from the western Pacific continental margin in SE China and Tethys-Tibet is proposed to explain the relationshipbetween plate convergence, granite and compressive deformation of the continental crust. Mineralisation related to granite formation, fault-block basins, formation of continental red beds and volcanism with examples from SE China, are also discussed in terms of the new model. In a final section, we introduce a new rock cycling model of the continental crust and the concept of Geochemical Fields of Elements, illustrating the unity between the microcosm and macrocosm of the natural world. Audience: This book will be of interest to scientists, researchers and students in geology, geophysics, geochemistry and economic geology
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Book details

List price: $199.99
Copyright year: 2007
Publisher: Springer
Publication date: 6/26/2007
Binding: Hardcover
Pages: 278
Size: 6.00" wide x 9.00" long x 0.75" tall
Weight: 1.386
Language: English

Introduction
Crustal melting : experiments and conditions
In situ melting and intracrustal convection : granite magma layers
Geological evidence for in situ melting origin of granite layers
Differentiation of magma layer : geochemical considerations
Mineralisation related to in situ granite formation
Heat source for crustal magma layers : tectonic models
Geological effects of crystallisation of a crustal granite magma layer : SE China
Material and element cycling of the continental crust and summary
Map of SE China showing provinces
Results of experimental rock melting