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Granite Genesis: In-Situ Melting and Crustal Evolution

GUO-NENG CHEN and RODNEY GRAPES. Pp. 278. Dordrecht, Springer. 2007. ISBN: 978-1-4020-5890-5 (hard cover). Price US$129.00.

Geological Survey of New South Wales, NSW Department of Primary Industries, P.O. Box 344, Hunter Region Mail Centre NSW 2310, Australia

The first 20% of the full text of this article appears below.

Chen and Grapes propose that granites form in situ through the melting of mid-upper crustal rocks to produce a convecting magma layer. This is in contrast to the more widely accepted intrusion model where fusion occurs in the lower to midcrust (with or without the involvement of mantle material), followed by emplacement and crystallization (and local assimilation) in the mid- to upper crust. In the proposed in situ model, the mid-upper crust becomes a closed system requiring only heat input mainly supplied through plate convergence. The implication is that granites represent no net addition of material to the crust, but of reorganization of material within it; hence, they are intracrustal. Individual granites exposed at the current land surface represent the protuberances within the upper surface of this extensive granite layer.

The book is divided into nine chapters. These cover a statement of the problem and related definitions; the experimental, geochemical, geophysical, and geologic . . . [Full Text of this Article]