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Granite Genesis: In-Situ Melting and Crustal Evolution, by Guo-Neng Chen, Rodney Grapes
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This book reviews current ideas explaining the formation of granite in terms of melting, segregation, ascent and emplacement. It introduces an alternative hypothesis that granites are endogenic in that they essentially form and remain at melting sites in the middle–upper crust under conditions of abnormally high heat flow. The book highlights results of Chinese research over the last 30 years in English for the first time.
- Sales Rank: #5129811 in Books
- Published on: 2007-08-17
- Original language: English
- Number of items: 1
- Dimensions: 9.24" h x .67" w x 6.49" l, 1.38 pounds
- Binding: Hardcover
- 278 pages
Review
From the reviews:
"Granite Genesis: In-Situ Melting and Crustal Evolution is a timely, well-structured, and enjoyable read. The authors provide a useful introduction to granite terminology and the ‘granite debate’ … The book benefits in continuity and style from having only two authors and is easy to read. … this book provides a valuable synthesis and is a great reference for all graduate students and professionals interested in granitic rocks, from their petrogenesis to emplacement mechanisms." (Victoria Pease, Geological Magazine, Vol. 146 (3), 2009)
From the Back Cover
Granitic rocks are a major component of the continental crust and the many and complex problems of their origin that have challenged geologists over some 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 meltingintracrustal 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 the geological, geochemical and geophysical studies from Australia, North and South America, Europe and China, and conclude that heat convection within a crustal partial melting layer is essential for 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 erosion surface. 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 relationship between 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 suggest 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.
Most helpful customer reviews
0 of 0 people found the following review helpful.
Underappreciated geological mechanism
By D. R. Martz
This is an excellent 'corrector' for the prevailing bias that granite is a more or less refined igneous melt. In actual field conditions granite is sometimes obviously an in-situ melt of felsic sediment, ancient beach sand, older eroded granite, and so on. Physically rising magma is not a pre-requisite and this book calls out evidence where heat flow was JUST sufficient to partially melt but not move the rock, which retains contacts with barely altered sedimentary rock. References to s-type or a-type don't give this concept justice as they typically imply more complete melting and movement. Considering the amount of felsic sediment on the continents, in-situ melting is probably more prevalent than generally assumed, and the lack of movement goes a long way to explain how there could be additional subtypes (and associated ores) based upon chemical and fluvial characteristics of basins.
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