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Altered Volcanic Rocks; A Guide to Description and Interpretation.

C. GIFKINS, W. HERRMANN, AND R. LARGE. 2005. 275 Pp. CODES Special Publication. University of Tasmania. ISBN 1862952191. Price AUD$135.

Petrascience Consultants Inc., 700-700 West Pender St., Vancouver, B.C. V6C 1G8, Canada

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

This volume is a comprehensive guide to alteration, primarily in submarine volcanic successions and in relation to volcanic rock-hosted massive sulfide (VHMS) deposits. The book has two great strengths: its general descriptions of the variations in style and type of alteration observed in submarine volcanic environments and the many case studies with detailed data pages that provide supporting evidence. The latter also serve as an excellent example of a comprehensive methodology for recording diverse data sets that relate to alteration.

The book is divided into chapters, with the first chapter, "Alteration in Submarine Volcanic Successions," providing a background for the book. An overview of the variety of processes that lead to alteration is followed by a summary of the general geology of the major VHMS districts referred to in the book. The majority of examples are based on the authors’ extensive knowledge of the Cambrian Mount Read volcanic rock sequence in western Tasmania and the Cambrian-Ordovician Mount Windsor subprovince in Queensland.

The next three chapters provide a framework for describing and understanding alteration. . . . [Full Text of this Article]