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The physical principles of rock magnetism
489 maps. Not only geologists but also engineers will find this chapter to be interesting reading. Chapter 11 presents an introduction to implications and problems of abnormally pressured reservoirs. The author briefly summarizes possible origins of abnormal pressures and takes a look at some of the prediction and detection methods available to the petroleum industry today. Of particular interest is the weU-presented treatment of abnormal pressures in the U.S. Gulf Coast area, with the major emphasis being placed on the chemical composition of deep formation waters in both abnormally high and normal (hydrostatic) formation pressure environments. Compatibility of oilfield waters is of utmost importance in oil production operations to prevent damage in the well bore and formation, avoid scaling problems, etc. In this chapter the author has compiled valuable informations as to solubility of various components in saline solutions and associated experimental investigations. In addition, brine stabilization and analysis of waterflood makeup brines are discussed. Chapter 13 takes an interesting look at the recovery of iodine and bromine from oilfield brines and evaluates the technical and economic possibilities of the "brine-refinery" concept, i.e., recovery of valuable minerals from saline waters. Furthermore, their occurrence and location within the U.S. are discussed in some detail. Subsurface disposal of brines, the historical review and present-day technology, are presented in Chapter 14, including a look at some of the environmental economic, and political aspects. This is followed by Chapter 15 which discusses solubility of some silicates in saline waters, both from an experimental and theoretical standpoint. Appropriately, the author concludes his book with a short but rather comprehensive review of the environmental impact of oil and gas well drilling, production operations, and associated waste disposal practices, including a compilation of pertinent references. All in all the book is well written and gives a superb and well-referenced discussion of the highlights in the subject area. This book offers not only interesting reading, but it also provides a source of much needed data and reference material related to the "Geochemistry of Oilfield Waters". It is highly recommended to industrial, academic, and research personnel alike. WALTER H. FERTL (Ponca City, Okla.)
The Physical Principles of Rock Magnetism. F.D. Stacey and S.K. Banerjee. Elsevier, Amsterdam, 1974, 195 pp., Dfl. 60.00. The subject of paleomagnetism has made great strides in the past few years and has led in part to the revolution in thinking about the earth. Paleomagnetism is based on the physical principles of rock magnetism and this book is therefore a very timely review of the basic material. The first chapter is a
490 relatively straightforward review of the basic principles of magnetism and is followed by a number of chapters of direct interest to rock magnetism. The description o f magnetic minerals is a useful summary of the subject. The omission of any reference to the properties of iron and iron--nickel is surprising in view of the abundance of these phases in lunar and meteorite samples. The distribution o f iron in various grain sizes represents an important new aspect of rock magnetism b u t it is based on an extensive literature on the magnetic properties of iron. In this sense a short w~iteup on meteorites is useful b u t extremely limited in scope for a b o o k published in 1974. Another surprising omission is the lack of reporting of work on mineral identification b y phase changes during heating. A remarkable number of things can be done in rock magnetism by this approach. The remainder of the b o o k surveys the literature quite adequately. Students who are specializing in rock magnetism should find this a useful c o m p e n d i u m of concepts and a useful starting point for future studies. A n u m b e r of important conceptual models are presented and the reader should understand that many of these continue to be the subject of discussion and research. For example, the question of the transition from single domain to multidomain is still n o t a settled matter nor is the precise role of chemical remanence in geological processes well understood. D. STRANGWAY (Toronto, Ont.)
Geochemical Exploration 1974 (Proceedings of the Fifth International Geochemical Exploration Symposium held in Vancouver, April 1--4, 1974). I.L. Elliott and W.K. Fletcher (Editors). Elsevier, Amsterdam, 1975, 720 pp., Dfl. 150.00. This volume is a must for every exploration geochemist. It contains the full text o f all the papers presented at the Fifth International Geochemical Exploration Symposium held in Vancouver in April, 1974. It is safe to assume that anything new and interesting in the art o f geochemical exploration for solid minerals will be discussed at these biennial meetings and will be reported on in their proceedings. Thus a review of such a b o o k is effectively a review of recent progress in the field. The b o o k is beautifully produced. It is regrettable, however, that it is so heavy -- almost four pounds -- so that it is likely to be left behind on long air trips. It is also regrettable that it costs so much -- U.S. $62.50 -- b u t here members of the Association of Exploration Geochemists have only themselves to blame ff they do not take advantage of the prepublication price o f U.S. $25.00 which will remain valid untill 1 May 1976. The volume contains a total o f 46 technical papers: the k e y n o t e address b y J o h n S. Webb, 7 general papers, 7 papers on statistical applications, 10 on
The Physical Principles of Rock Magnetism. F.D. Stacey and S.K. Banerjee. Elsevier, Amsterdam, 1974, 195 pp., Dfl. 60.00. The subject of paleomagnetism has made great strides in the past few years and has led in part to the revolution in thinking about the earth. Paleomagnetism is based on the physical principles of rock magnetism and this book is therefore a very timely review of the basic material. The first chapter is a
490 relatively straightforward review of the basic principles of magnetism and is followed by a number of chapters of direct interest to rock magnetism. The description o f magnetic minerals is a useful summary of the subject. The omission of any reference to the properties of iron and iron--nickel is surprising in view of the abundance of these phases in lunar and meteorite samples. The distribution o f iron in various grain sizes represents an important new aspect of rock magnetism b u t it is based on an extensive literature on the magnetic properties of iron. In this sense a short w~iteup on meteorites is useful b u t extremely limited in scope for a b o o k published in 1974. Another surprising omission is the lack of reporting of work on mineral identification b y phase changes during heating. A remarkable number of things can be done in rock magnetism by this approach. The remainder of the b o o k surveys the literature quite adequately. Students who are specializing in rock magnetism should find this a useful c o m p e n d i u m of concepts and a useful starting point for future studies. A n u m b e r of important conceptual models are presented and the reader should understand that many of these continue to be the subject of discussion and research. For example, the question of the transition from single domain to multidomain is still n o t a settled matter nor is the precise role of chemical remanence in geological processes well understood. D. STRANGWAY (Toronto, Ont.)
Geochemical Exploration 1974 (Proceedings of the Fifth International Geochemical Exploration Symposium held in Vancouver, April 1--4, 1974). I.L. Elliott and W.K. Fletcher (Editors). Elsevier, Amsterdam, 1975, 720 pp., Dfl. 150.00. This volume is a must for every exploration geochemist. It contains the full text o f all the papers presented at the Fifth International Geochemical Exploration Symposium held in Vancouver in April, 1974. It is safe to assume that anything new and interesting in the art o f geochemical exploration for solid minerals will be discussed at these biennial meetings and will be reported on in their proceedings. Thus a review of such a b o o k is effectively a review of recent progress in the field. The b o o k is beautifully produced. It is regrettable, however, that it is so heavy -- almost four pounds -- so that it is likely to be left behind on long air trips. It is also regrettable that it costs so much -- U.S. $62.50 -- b u t here members of the Association of Exploration Geochemists have only themselves to blame ff they do not take advantage of the prepublication price o f U.S. $25.00 which will remain valid untill 1 May 1976. The volume contains a total o f 46 technical papers: the k e y n o t e address b y J o h n S. Webb, 7 general papers, 7 papers on statistical applications, 10 on