Mtl6-703?/85,%3.00
&o&mica n Cdiminr daa Vol.49,W. 1083~1085 Q mgmait Rar L.&t. 1985. Printed in U.S.A.
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BOOK REVIEWS
and how they control or are controlled by the eruption process. Finally, someone has assembled, in one place, atI of the recent eruption models of British vol~oi~~; until ~RtXZ..ASTiC RoC!KS is a ~rn~~ve and eZ+!3& used now these have been scattered shutout a large variety of refma and textbook that covers all aspects of pyroclastic sometimes obscure journals. rock, their genesis, detition, &ration, and erosion. This All types of pyrock&ic deposits are described with regard is the only book available on the subject and arrives at a to eruption phenom~~ structure of the deposits, postdetime when msearch in the field of explosive volcanism is positional e&c&, and physkal pmperties. At the end of moving rapidly forward. each chapter is a com~hensive and u&id tabular summary Pyroclastic rocks have, in the pa!% been ignored or of deposit charactetistics. These summaries alone are worth quickly passed over in most books on igneous petrology and the price of the book. Of particular interest to GCA readers volcanology. However, the products of explosive volcanism is the chapter on alteration of pyroclastic rocks. It covers, tell us a mt deal about eruption processesand petrogenesis among other things, the diagenesis of basaltic and rbyolitic of volcanic rocks on the terrestrial pkinets. what we can glasses in diffe=nt e~~ronrn~~ and illustrates the subselearn through the study of these rocks is covered in great quent changes in texture, minemiogy, and chemistry. detail in this book. It has been written with an enthusiasm If you are in volcanofogy, igneous petro&y, sedimentary and experIise that makes the text very readable. Tbe many petrology,or geocbemii, this book is an excellent reference. phot~phs and i&&rations are fbst class and always It is an example of inte~i~~in~ science at its best and requin a second look. bridges the artificial gap between igneous and sedimentary This book wifl also serve welI as a fimdamental text in petrology that has existed for so fang. volcanology, covering everything &om magma genesis to Grant Heiken deposition of volcanogenic sediments. There are chapters on physical properties and chemistty of erupting magmas Rocks, by R V. Fisher and H.-U. Scbmincke, 1984, Stinger-Ver& 472 pp.. $49.50 (Hardcover).
Andean
bairn: Chemical and k?atopic &iatraints, edited by R. S. Harmon and B. A. Barreiro, 1984, Shiva Publishing Limited, 250 p., f25.00 (hardcover), f12.50 (pape*k). THE ANMAN MOUNTAIN chain is pmbably the most often used exampk of a continental island are. In spite of this it ~~~~~fi~~rn~~~~mof~~ of this area This collection of sixteen lthisne&.Tbesepapersresuitedfroma special symposium on Andean ~ held at the 1983 spring AGU mee&ng. The cocoon fwtmi in most of these papem is current and re&cts reumt or on-going msearcb. The authors and editors ate congratulated for prod&ng a timely publication. ~e~k~~~in~~~~~e~~o~ contains nine w on the younger volcanic rocks of the Andes and one on basaltic rocks Ram Guatemala. The second section has six papers on the Mesozoic to Cenozoic, plutonic-vokanic compiexea of the Andes. The scope and contentofthepapersarevaritMe.Someofthepapersare
v~~~(S~~~~~ya~~~~.
~~~~~~25~~~~~~~a~~ ~~~a~~~it~~~~~t~~ the papers are basically reviews in their style of prmentation. Onegoalofthe multiintern studies torus compkx Platonic probkms
Many of the papers reflect this goal by combining some type of isotopic data with major and/or trace element geochemistry. There are however four papers that deal with isotopic data only (two on common Pb, one on 0, and one on Sr, Nd, Pb, and O), and at least five papem that are domi~ntly g~~rni~ witb only a mention of isotopic data. The intended audience for this book is scientists already familiar with the Andes, but there is enough general infotmation a&able in the book to put the more specific papers in a sneral geologic fhsmework.Only a general background in -istry is needed to digest most of the inf~tion in this book, and anyone with an interest in regional or petrologic variations in geochemical characteristics will find much of vaiue. The papers do a good job of illume that a variety of petrogenetic inbox is not o&y possibIe but ncccssBsy for calcalkaIine rocks at a continent-ocean boundary. A further advantage of this book is that it is a single source for most of the rtzent references on the geochemistry of the area. A pemonal disappointment is the lack of actual data in the papers. There me many figums astir much data, but data ta& in &most nonexistent. As a working geochemist it is frustrating to not be able to inspect some individual antdyses (even in review papers) and plot them with other data.
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