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Petrology of the ocean floor
305 quake risk, such as those by Lomnitz, Gupta or Ambraseys. Similarly, in the section on landslides no reference is made to the fundamental stability analyses of Terzaghi, Zaruba, MencI and others upon which any rational risk estimate must be based. Similar remarks could be made regarding the treatment in the
tions on their geological settings, structures, mineralogy, textures, phases and whole rocks geochemistry) but also by a good review on the petrogenetic interpretations suggested for their origin. The author has a good knowledge of the topics. Because he is an active petrologist of the CNEXO french oceano-
book of the other types of hazards, but let the mentioned ones suffice. The book contains a number of statistical
graphic teams, it is not surprising that he is
tables of dollar losses, sustained mostly in the United States, in various years due to the occurrence of disasters. This may be of some value to insurance companies, but the tables would probably require a further scrutiny regarding the exact circumstances of the occurrence of the losses before they could be used with confidence for actuarial purposes.
effectively dredged a n d / o r drilled on the ac-
A.E. Scheidegger, Vienna
PETROLOGY
mainly concerned with the petrological problems of the ocean rocks which have been tual sea-floor. Don't try to find the term " o p h i o l i t e " in the subject index: this word is lacking perhaps because Dr. R. Hekinian reasonably claims that " w e are far from having a clear picture of the deep-seated processes involved in the creation of new crust". The main result of this attitude is that the book appears static by omission of references to those numerous papers dealing not only with p e t r o l o g y v e r s u s g e o d y n a m i c s of the s e a - f l o o r but also with c o m p r e h e n s i v e processes and models such as the magmatic differentiation mechanisms advocated for the
R. Hekinian, 1981. Petrology of the Ocean Floor. Geological Survey of Papua New Guinea, Mere. 10, xvi + 265 pp., PNG Kina 22.00.
crustal accretion in oceanic-ridges, island arcs, seamounts, etc., or the thermotectonic structures at plate boundaries referring to present data on oceanic rock fabrics. Apart from these remarks, the book will
Since the last 20 years, numerous struc-
nevertheless appear as an excellent tool
tural, petrographical and geochemical data on the ocean floor rocks (eruptive and volcanic) have been published either in
which must figure in every geological library for advanced students as well as for petrologists and geochemists interested in the spe-
classical papers and journals or in more or less accessible reports. This proliferation has become so enormous and the sources are so scattered that it is now very difficult to select the most important and meaningfull informations in order to establish a coherent, even
cial problems of the ocean rocks. J.-P. Bard, Montpellier
PLANETARY GEOLOGY
provisional, petrological synthesis. In this respect, one must commend Dr. R. Hekinian for having joined within a single 393 pages volume, the strongly dispersed data on the ocean rocks and for having attempted to give insights into their diversities either to significant geological settings or major petrological processes such as magmatism, metamorphism, tectonics, hydrothermalism, deuteric alteration and weathering. That well-illustrated work is based on sound documentary evidence. It is undoubtedly attractive not only by the extensive source of numerous data concerning the endogenic ocean rocks (with accurate informa-
B.P. Glass, 1982. Introduction to Planetary Geology. C a m b r i d g e Planetary Science Series, 2, Cambridge University Press, x + 469 pp., £18.00.
Introduction to PLanetary Geology is a well-written, comprehensive and
relatively
up-to-date textbook that has been needed for some time. It is one of the few textbooks which gives a comprehensive overview of planetary geology including the Voyager re.suits at Jupiter and Saturn. The author considers his book to be appropriate for senior and graduate students, but I believe it is more
tions on their geological settings, structures, mineralogy, textures, phases and whole rocks geochemistry) but also by a good review on the petrogenetic interpretations suggested for their origin. The author has a good knowledge of the topics. Because he is an active petrologist of the CNEXO french oceano-
book of the other types of hazards, but let the mentioned ones suffice. The book contains a number of statistical
graphic teams, it is not surprising that he is
tables of dollar losses, sustained mostly in the United States, in various years due to the occurrence of disasters. This may be of some value to insurance companies, but the tables would probably require a further scrutiny regarding the exact circumstances of the occurrence of the losses before they could be used with confidence for actuarial purposes.
effectively dredged a n d / o r drilled on the ac-
A.E. Scheidegger, Vienna
PETROLOGY
mainly concerned with the petrological problems of the ocean rocks which have been tual sea-floor. Don't try to find the term " o p h i o l i t e " in the subject index: this word is lacking perhaps because Dr. R. Hekinian reasonably claims that " w e are far from having a clear picture of the deep-seated processes involved in the creation of new crust". The main result of this attitude is that the book appears static by omission of references to those numerous papers dealing not only with p e t r o l o g y v e r s u s g e o d y n a m i c s of the s e a - f l o o r but also with c o m p r e h e n s i v e processes and models such as the magmatic differentiation mechanisms advocated for the
R. Hekinian, 1981. Petrology of the Ocean Floor. Geological Survey of Papua New Guinea, Mere. 10, xvi + 265 pp., PNG Kina 22.00.
crustal accretion in oceanic-ridges, island arcs, seamounts, etc., or the thermotectonic structures at plate boundaries referring to present data on oceanic rock fabrics. Apart from these remarks, the book will
Since the last 20 years, numerous struc-
nevertheless appear as an excellent tool
tural, petrographical and geochemical data on the ocean floor rocks (eruptive and volcanic) have been published either in
which must figure in every geological library for advanced students as well as for petrologists and geochemists interested in the spe-
classical papers and journals or in more or less accessible reports. This proliferation has become so enormous and the sources are so scattered that it is now very difficult to select the most important and meaningfull informations in order to establish a coherent, even
cial problems of the ocean rocks. J.-P. Bard, Montpellier
PLANETARY GEOLOGY
provisional, petrological synthesis. In this respect, one must commend Dr. R. Hekinian for having joined within a single 393 pages volume, the strongly dispersed data on the ocean rocks and for having attempted to give insights into their diversities either to significant geological settings or major petrological processes such as magmatism, metamorphism, tectonics, hydrothermalism, deuteric alteration and weathering. That well-illustrated work is based on sound documentary evidence. It is undoubtedly attractive not only by the extensive source of numerous data concerning the endogenic ocean rocks (with accurate informa-
B.P. Glass, 1982. Introduction to Planetary Geology. C a m b r i d g e Planetary Science Series, 2, Cambridge University Press, x + 469 pp., £18.00.
Introduction to PLanetary Geology is a well-written, comprehensive and
relatively
up-to-date textbook that has been needed for some time. It is one of the few textbooks which gives a comprehensive overview of planetary geology including the Voyager re.suits at Jupiter and Saturn. The author considers his book to be appropriate for senior and graduate students, but I believe it is more