In recent years, there has been increasing interest from geoscientists in potassic ig neous rocks. Academic geoscientists have been interested in their petrogenesis and their potential value in defining the tectonic setting of the terranes into which they were intruded, and exploration geoscientists have become increasingly interested in the association of these rocks with major epithermal gold and porphyry gold-copper deposits. Despite this current interest, there is no comprehensive textbook that deals with these aspects of potassic igneous rocks. This book redresses this situation by elucidating the characteristic features of potassic (high-K) igneous rocks, erecting a hierarchical scheme that allows interpre tation of their tectonic setting using whole-rock geochemistry, and investigating their associations with a variety of gold and copper-gold deposits, worldwide. About two thirds of the book is based on a PhD thesis by Dr Daniel Muller which was produced at the Key Centre for Strategic Mineral Deposits within the Department of Geology and Geophysics at The University of Western Australia under the supervision of Professor David Groves, the late Dr Nick Rock, Professor Eugen Stumpf!, Dr Wayne Taylor, and Dr Brendon Griffin. The remainder of the book has been compiled from the literature using the collective experience of the two authors. The book is dedi cated to the memory of Dr Rock who initiated the research project but died before its completion.

The idea to produce this book originated during the "Tectonics and Sedimentation of Indonesia" seminar, the first regional meeting of the Indonesian Sedimentologists Forum (FOSI), the sedimentological commission of IAGI, in 1999. The meeting was conducted to commemorate the 50 years anniversary of the publication of van Bemmelen's book, entitled "Geology of Indonesia" (1949). This was the first book to deal indepth with Indonesian geology at that time. This work was written before the offshore exploration activities and is now out of print. Van Bem-melen's book is a classic of its type that covers onshore geology and some fields of geological en-quiry that have not been superceded by more modern work. In this volume, we have attempted to compile pre-existing publications. Additional recent insights understandings were added to give an up-to-date picture of the geology of Indonesia. It was found that much of geological data have been gathered since the first exploration activity some 150 years ago but was not utilized or even widely known by geologists recently. "An Outline of the Geology of Indonesia" is a compilation of mainly published materials using post van Bemmelen's concept and understanding. We have incorporated facts, ideas, philosophies, and prejudices of many authors; some are quoted and acknowledged; others have been absorbed and blended. These materials have been bound together to gave readers a regional view of Indonesia. Our main problems have been the selection of material and the need to strike a balance between each chapter. The book is far from perfect and ongoing efforts will be made to upgrade the contents of this book. Suggestions and input are most welcome to improve the next edition. The book is organized geographically into fourteen chapters, starting from the West and ended with Irian Jaya. Each chapter covers general geology, stratigraphy, and tectonic history. We have also endeavored to list as many references as possible in order to enable users to explore for themselves the original works.

Within the last decade, the high and continuing demand for gold has prompted a global gold rush on a scale never before seen, not even in the heady days of Ballarat, California and the Yukon. Gold is being sought on every continent and, with very few exceptions, in every country around the world. Such interest and fierce competition has demanded considerable innovation and improvement in exploration techniques paralleled by a rapid expansion of the geological database and consequent genetic modelling for the many different types of gold deposits now recognized. This proliferation of data has swamped the literature and left explorationist and academic alike unable to sift more than a small proportion of the accumulating information. This new book represents an attempt to address this major problem by providing succinct syntheses ofall major aspects ofgold metallogeny and exploration, ranging from the chemical distribution of gold in the Earth's crust, and the hydrothermal chemistry of gold, to Archaean and Phanerozoic lode deposits, epithermal environments, chemical sediments, and placer deposits, and culminates in chapters devoted to geochemical and geophysical exploration, and the economics of gold deposits. Each chapter is written by geoscientists who are acknowledged internationally in their respective fields, thus guaranteeing a broad yet up-to-date coverage. In addition, each chapter is accompanied by reference lists which provide readers with access to the most pertinent and useful publications.