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This book is a practical guide for field geologists. Consequently it deals mainly with the physical attributes of granites as encountered in the field. However, granites have always been a focus for controversy, the nature of which has changed as the science has evolved, but which has been essentially concerned with the nature and origin of granites of every kind. This work is published at a time when modern experimental work seems to be close to resolving these fundamental questions. Nevertheless its prime purpose is to portray the astonishing variety of granite phenomena as seen by the field geologist.
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Lecture Notes Earth Sciences Editors: S. Bhattacharji, Brooklyn G. M. Friedman, Brooklyn and Troy H. J. Neugebauer, Bonn A. Seilacher, Tuebingen and Yale Springer Berlin Heidelberg New York Barcelona Hong Kong London Milan Paris Singapore Tokyo John Cobbing The Geology and Mapping of Granite Batholiths With 40 Figures Springer Author Dr. John Cobbing 25, Main Road NGI 2 2BE Radcliffe on Trent Great Britain "For all Lecture Notes in Earth Sciences published till now please see final pages of the book" ISSN 0930-0317 ISBN 3-540-67684-8 Springer-Verlag Berlin Heidelberg New York Cataloging-in-Publication data applied for Die Deutsche Bibliothek - CIP-Einheitsaufnahme Cobbing, John: The geology and mapping of granite batholiths 1 John Cobbing. Berlin; Heidelberg; New York; Barcelona; Hongkong; London; Milan; Paris; Singapur; Tokio: Springer 2000 (Lecture notes in earth sciences; 96) ISBN 3-540-67684-8 This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer-Verlag. Violations are liable for prosecution under the German Copyright Law. Springer-Verlag Berlin Heidelberg New York a member of BertelsmannSpringer Science+Business Media GmbH O Springer-Verlag Berlin Heidelberg 2000 Printed in Germany The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. Typesetting: Camera ready by author SPIN: 1071 1221 Printed on acid-free paper 3213130-543210 Preface This book is mainly about the field geology of granites at all scales from that of a single outcrop to plutons and batholiths. All field geologists work initially at the scale of the outcrop, consequently most of the phenomena treated herein are those which are visible at outcrop scale. However, granites typically occur as plutons and batholiths, some of which are so large as to apparently defy any effort at systematic treatment. Having had the opportunity of mapping two very large and very different batholiths, namely the Coastal Batholith of Peru and the tin granites of Southeast Asia, I have found that it is possible to map large batholiths within a relatively short time, so that the geology of the batholith as a whole can be appreciated. Moreover batholiths are one of the most common modes of granite occurrence, so it makes sense to study them at their natural scale. During my working life I have worked with many geologists from underdeveloped countries and this book is mainly to help them in unravelling the geology of their native batholiths. I have been lucky with my friends and colleagues of many national