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The geological applications of these subjects, including those in the field of palaeostress analysis, are developed in Twiss, R. The terms that a geologist uses to describe hardback; ISBN Kinematic In an ideal world, the recommended textbook for a given course would folding models receive attention in Chapter 12 but I cannot help but be one written by the course teacher.
However, given the real situation think that the discussion here and in the two chapters which follow is where the vast majority of courses have to make do with texts written hindered by the fact that strain theory has not been dealt with at this by third parties, this new textbook by Robert Twiss and Eldridge stage in the book.
For example, flexural-slip folding is explained in Moores is probably the next best thing. Described in the Preface as an terms of flexed card decks but the resulting strain patterns are not introductory text, this hefty page work could be used to support discussed. In this chapter the geometrical features of superposed folds several structural geology courses spanning the range from undergrad- are well illustrated but the 2-page discussion is probably insufficient for uate to post-graduate levels.
This is made possible because of the the student intending a practical analysis of real field data. Chapters 13 unique layout of the text which separates the observational, descrip- and 14 are concerned with foliations and lineations; their morphology tive aspects of geological structures which are more accessible for the and genesis, respectively. Again quantitative aspects are not side-stepped but this This book has most of the essential ingredients of a good structural time the Mohr construction is not used.
I was somewhat disappointed geology course text. Structural geology is concerned to a large extent by the fact that although it is explained that tensors can be used to with the variety and beauty of natural forms and the authors have done describe strain, the example used is not applicable to the large service to their subject by collecting together a large number of visually magnitude strains found in rocks. Besides this, the authors are to be attractive images to catch the eye of the student.
Through more than commended on the way they lead the reader through the terminologi- figures, the student is treated not only to the usual line drawings cal minefield of rotational strain, coaxial strain and vorticity.
The and outcrop snapshots but also to a fair number of air photos and succeeding chapter looks at structures such as folds and foliations from seismic sections. These figures are not only abundant but are of the point of view of strain distributions.
This is followed by a chapter, excellent quality. The third dimension, so vital yet so often ignored, Observations of Strain in Rocks, dealing with the principal techniques receives full attention. The coverage of topics is encyclopedic. Attempts by the reviewer to discover new areas of the subject which Part 4 consists of three chapters on rock rheology.
The first deals have been omitted failed totally. Here and throughout the book results are presented in text Brittle Deformation; Ductile Deformation; Rheology; and Tectonics. To have to do The first of these includes a chapter entitled Overview which defines detective work to match the items with the reference lists at the end of the subject areas of structural geology and tectonics in terms of rock each chapter could irritate slightly.
The chapter that follows contains a deformation on different scales. This is followed by a rather mixed useful summary of the deformation mechanisms operating on a micro- chapter called Techniques of Structural Geology and Tectonics which, scopic scale in rocks undergoing ductile deformation.
Discussion of in spite of its name, devotes little space to practical methods but mechanisms involving the movement of dislocations leads on in a instead gives brief mention of the popular formats for representing natural way to the subject of crystallographic fabric development. The geological structures maps, sections, etc. For example, stereo- section is concluded by Chapter 20 which is concerned with the graphic projection is described here in concept but plotting procedures mathematical and analogue modelling of ductile deformation.
The final part of the book is devoted to tectonics. A general survey Part 2 begins with a systematic survey of the principal classes of of the principal tectonic features of the Earth is followed up by looking brittle structures dealt with from a largely geometrical standpoint.
This at greater detail at the make-up of orogenic belts. This chapter is achieved in chapters entitled Fractures and Joints; Introduction to provides the opportunity for pointing out the value of several sub- Faults; Normal Faults; Thrust Faults; and Strike-slip Faults. Coverage disciplines of our subject, such as kinematic analysis using folds and is exhaustive with the inclusion of up-to-the-minute topics such as foliations together with fabric and strain analysis, metamorphic core complexes, shear criteria and models for hanging- In summary, this attractive well-produced book, with its compre- wall deformation in normal faults.
In common with some other texts, hensive coverage of topics, is the one to refer to for finding out what the basis of the klippe-window method of estimating minimum thrust terms like crenulation cleavage, Nabarro-Herring creep and strike- displacement is poorly explained.
Surely the sinuosity of the outcrop slip duplexes mean; there are better books around for finding out how trace is irrelevant. Thankfully though we are spared the alternative, to implement practical techniques for structural analysis.
Structural so-called bow-and-arrow rule for finding thrust movement; a rule no- Geology is therefore an ideal book to complement other existing texts one has successfully convinced me is valid. There are errors e. Fig which place greater emphasis on problem solving, worked examples 4. In keeping with the Cardiff, U. We thus encounter stress for the first time in Chapter 8 though the wait is worth it. The treatment is serious and at the same time reader-friendly.
For example the average reader Shear sense, and more will appreciate the pages headed "What is a vector? Shear-sense Indi- dimensions. I would like to have seen mention of the pole of the Mohr cators: A Review. Geological Survey of Canada, Paper circle because it simplifies understanding of how orientations are expressed in Mohr space.
This chapter benefits from the worked out Geological Survey of Canada, Ottawa, Canada.
Eldridge M. Moores
The geological applications of these subjects, including those in the field of palaeostress analysis, are developed in Twiss, R. The terms that a geologist uses to describe hardback; ISBN Kinematic In an ideal world, the recommended textbook for a given course would folding models receive attention in Chapter 12 but I cannot help but be one written by the course teacher. However, given the real situation think that the discussion here and in the two chapters which follow is where the vast majority of courses have to make do with texts written hindered by the fact that strain theory has not been dealt with at this by third parties, this new textbook by Robert Twiss and Eldridge stage in the book.
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