Download or read book High Temperature Deformation Mechanisms and Strain Heterogeneities in Calcite Rocks written by Lili Xu (Sh. D.) and published by . This book was released on 2008 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: In nature, carbonates often accumulate large amounts of strain in localized shear zones. Such marble sequences play a key role in crustal deformation processes. Despite extensive field and laboratory investigation, many questions remain concerning the mechanical behavior of these rocks. For example, the mechanical behavior of different limestones and marbles differ greatly, possibly owing to the presence of chemical impurities or solid-solutes. Thus, Chapter 2 examines the effect of Mg solute, a common impurity, on the mechanical behavior of calcite rocks. The results indicate that increasing Mg content increases the strength of calcite rocks during dislocation creep. The anisotropic nature of crystal slip usually entails variations in reorientation of individual grains and heterogeneous deformation within the polycrystalline material. In Chapter 3, a new technique including a series of sample preparation and image analysis algorithms is developed to provide quantitative measurements of the scale of heterogeneities produced, and to gain fundamental insight into polycrystalline plasticity. We place particular attention on quantifying variations of strain within grain interiors and at grain boundaries, and on recognizing the relative activities of different slip systems. The quantification of grain-to-grain interactions during straining is relevant for the improvement and verification of models of polycrystalline plasticity. The strain measurements obtained from Chapter 3 are compared with predictions of grain strain and reorientation obtained from the self-consistent viscoplastic method (Chapter 4). The results suggest that the self-consistent model gives a good description of global texture, but does not always predict lattice rotation and deformation within individual grains. To predict the actual deformation of individual grains will require a quantitative consideration of the effects on local strain of grain-boundary misorientation, local strain/stress state, grain-boundary sliding, and deviations in grain geometry.
Download or read book Calcite Twin Morphology written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Twinning of the e-plane is the dominant crystal- lastic deformation mechanism in calcite deformed below about 400 °C. Calcite in a twin domain has a different crystallographic orientation from the host calcite grain. So-called thin twins appear as thin black lines when viewed parallel to the twin plane at 200- 20× magnification under a petrographic microscope. Thick twins viewed in the same way have a microscopically visible width of twinned material between black lines. Calcite e-twin width and morphology has been correlated with temperature of deformation in naturally deformed coarse-grained calcite. In this paper, we present a compilation and analysis of data from limestones of the frontal Alps (France and Switzerland) and the Appalachian Valley and Ridge and Plateau provinces (eastern United States) to document this temperature dependence. Mean calcite twin width correlates directly with temperature of deformation such that thin twins dominate below 170 °C and thick twins dominate above 200 °C. Above 250 °C dynamic recrystallization is an important deformation mechanism in calcite. Mean twin intensity (twin planes/mm) correlates negatively with temperature, and a cross plot of twin intensity with twin width can yield information about both strain and temperature of deformation. These relationships provide a deformation geothermometer for rocks that might otherwise yield little or no paleotemperature data.
Download or read book Deformation Processes in Minerals Ceramics and Rocks written by D.J. Barber and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph has its origins in a two-day meeting with the same title held in London, England in the spring of 1987. The idea for the meeting came from members of the UK Mineral and Rock Physics Group. It was held under the auspices of, and made possible by the generous support of, the Mineralogical Society of Great Britain and Ireland. Additional financial assistance was provided by ECC International pIc and the Cookson Group pIc. The aims of the London meeting were to survey the current state of knowledge about deformation processes in non-metallic materials and to bring together both experts and less experienced Earth scientists and ceramicists who normally had little contact but shared common interests in deformation mechanisms. This monograph has similar aims and, indeed, most of its authors were keynote speakers at the meeting. Consequently, most of the contributions contain a review element in addition to the presentation and discussion of new results. In adopting this format, the editors hope that the monograph will provide a valuable state-of-the-art sourcebook, both to active researchers and also to graduate students just starting in the relevant fields.
Download or read book Mineral and Rock Deformation written by Bruce E. Hobbs and published by American Geophysical Union. This book was released on 1986 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energetics of Geological Processes written by H. Annersten and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hans Ramberg is working in an area of geology where 60 years are a short, often negligible period of time. This is not so in the lives of men. For us it is a time for evaluating past accomplishments and a time for friends to express their appreciation and admiration. Some universities have become famous for this ability to foster eminent scientists in one or several fields. The success of Cambridge University in physics is a well-known example, but if we ask ourselves whether the success of Oslo University in earth sciences is not equally astonishing, then we see that Hans is yet another example of this process; but it is not the whole story. There were certainly promising prospects when he started his studies in geology: V. M. Goldschmidt had just come back from G6ttingen in Germany and Tom Barth had returned from the Geophysical Laboratory in Washington, D.C. Two leaders in geochemistry and petrology at the same time! Hans became a student of Barth, specializing in metamorphic rocks and their problems; but soon the situation changed. Norway was occupied by the Germans and the possibili ties for university studies almost vanished. However, in spite of all difficulties he obtained his Ph.D. in 1946 and began participating in the geological mapping of Greenland. In 1947 he went to the University of Chicago and stayed there until 1961 when he came to his present position in the University of Uppsala, Sweden.
Download or read book A Practical Guide to Rock Microstructure written by Ron H. Vernon and published by Cambridge University Press. This book was released on 2004-10-07 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rock microstructures provide clues for the interpretation of rock history. A good understanding of the physical or structural relationships of minerals and rocks is essential for making the most of more detailed chemical and isotopic analyses of minerals. Ron Vernon discusses the basic processes responsible for the wide variety of microstructures in igneous, sedimentary, metamorphic and deformed rocks, using high-quality colour illustrations. He discusses potential complications of interpretation, emphasizing pitfalls, and focussing on the latest techniques and approaches. Opaque minerals (sulphides and oxides) are referred to where appropriate. The comprehensive list of relevant references will be useful for advanced students wishing to delve more deeply into problems of rock microstructure. Senior undergraduate and graduate students of mineralogy, petrology and structural geology will find this book essential reading, and it will also be of interest to students of materials science.
Download or read book Principles of Rock Deformation and Tectonics written by Jean-Luc Bouchez and published by Oxford University Press. This book was released on 2021-08-31 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book originates in the French classic "Principes de Tectonique" (Masson, 1983), written by professor Adolphe Nicolas, and the more recent "Principes de Tectonique" by J.L. Bouchez and A. Nicolas (De Boeck, 2018). This English edition is an up-to-date and augmented version that keeps the concise and rigorous writing of its inspiring predecessors. It is largely based on laboratory and field experience of both authors, with a focus towards hard rocks and magmatic rocks from both the continental crust worldwide and the mantle, principally from the Oman ophiolites. The book includes more than 250 illustrations, most of them original. In addition to classic geological subjects, the book includes elements such as plastic deformation of ice, quartz and olivine, fabric acquisition in rocks and magmas, measurement and orientation of stress, together with basic background information on neotectonics, geophysics and other practical tools such as magnetic fabrics not commonly treated in geological books. Since the targeted readers are present day young students, a few exercises of structural geology are included to improve their abilities. This book aims principally at students of Geology, at both the undergraduate and graduate levels. However, due to its numerous illustrations and rather concise writing, anyone interested in rock deformation and/or tectonics will find key answers in this book.
Download or read book Deformation Mechanisms Rheology and Tectonics written by D. Gapais and published by Geological Society of London. This book was released on 2005 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consists of 18 papers on deformation mechanisms, rheology and tectonics. The main approaches include experimental rock deformation, microstructural analysis, field structural studies, analogue and numerical modelling. New results on various topics are presented, ranging from brittle to ductile deformation and grain-scale to lithospherescale mechanisms. The volume contains review papers on several major current topics, such as the rheology of the lithospheric mantle and the mechanisms of exhumation of high-pressure tectonic units, as well as research papers on kinematic and mechanical analysis of rock deformation and related new techniques. Several contributions emphasize the increasing ability and wish of researchers to strengthen the links between small-scale physical mechanisms and large-scale tectonics. The volume will be of interest to academic and industrial researchers in the fields of structural geology, interactions between metamorphism, fluids and deformation, and large-scale tectonic processes.
Download or read book Deformation Microstructures and Mechanisms in Minerals and Rocks written by Tom G. Blenkinsop and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a systematic guide to the recognition and interpretation of deformation microstructures and mechanisms in minerals and rocks at the scale of a thin section. Diagnostic features of microstructures and mechanisms are emphasized, and the subject is extensively illustrated with high-quality color and black and white photomicrographs, and many clear diagrams. After introducing three main classes of deformation microstructures and mechanisms, low- to high-grade deformation is presented in a logical sequence in Chapters 2 to 5. Magmatic/submagmatic deformation, shear sense indicators, and shock microstructures and metamorphism are described in Chapters 6 to 8, which are innovative chapters in a structural geology textbook. The final chapter shows how deformation microstructures and mechanisms can be used quantitatively to understand the behavior of the earth. Recent experimental research on failure criteria, frictional sliding laws, and flow laws is summarized in tables, and palaeopiezometry is discussed. Audience: This book is essential to all practising structural and tectonic geologists who use thin sections, and is an invaluable research tool for advanced undergraduates, postgraduates, lecturers and researchers in structural geology and tectonics.
Download or read book Rock Deformation from Field Experiments and Theory written by D.R. Faulkner and published by Geological Society of London. This book was released on 2015-10-26 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ernie Rutter has made, and continues to make, a significant impact in the field of rock deformation. He has studied brittle and plastic deformation processes that occur within both the oceanic and continental crust, as well as other key properties such as the permeability and seismic velocities of these rocks. His approach has been one that integrates field observations, laboratory experiments and theoretical analyses. This volume celebrates Ernie's key contribution to rock deformation and structural geology by bringing together a collection of papers that represent this broad approach. The papers within the volume address key issues that remain within these fields. These range from fundamental studies of brittle and plastic behaviour along with the resultant structures and microstructures from both the field and laboratory, to applied problems where a better understanding of the deformation and properties of the crust is still needed.
Download or read book Strain Heterogeneity During Creep of Carrara Marble written by Alejandra Quintanilla Terminel and published by . This book was released on 2014 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Creep processes in calcite have been extensively studied, leading to the establishment of deformation mechanism maps. However, flow laws assuming a steady-state and homogeneous creep deformation cannot describe the strain localization and evolving structure described in numerous experimental and field studies. The micromechanical models need therefore to be revisited, and more experimental work and alternative methods to describe strain evolution are necessary. This work focused on the development of experimental and computational tools to describe strain at a micrometric scale, and their application to creep of Carrara marble. Two experimental series, one varying temperature (T), the other varying strain were performed in compression in a conventional triaxial apparatus (Paterson Instruments) at 300 MPa, T=400-700°C strain rate of 3 x 10 5 s- 1 and strains of 0.11, 0.22 and 0.36. Chapters 2 and 3 describe the microfabrication and computation technique developed for mapping deformation at a microscale. Chapter 4 describes the development of strain heterogeneity in the experimental series and Chapter 5 provides a complementary crystallographic analysis and preliminary work regarding modeling of the strain field. The experiments document a progressive transition as temperature increases from 400°C to 700°C , from a regime where twinning is an important mechanism of strain accommodation towards an increasing activity of intracrystalline slip systems. This transition is accompanied by a change in length scale of strain heterogeneity. At low T, strain is localized in bands spanning several grains. At high T, strain is more localized along grain boundaries. Furthermore, the wavelength of heterogeneities decreases to a quarter of the grain size, in parallel with an increase in their amplitude. This evolution is also seen at a grain scale and is accompanied by a greater change in crystallographic preferred orientation with respect to the undeformed natural sample, both at the low T and high T end-members of the series. The wavelengths of heterogeneities decrease with strain, suggesting the microstructure has not reached steady state despite a trend towards a local homogenization. This work provides a quantitative analysis of the evolution of intra- and intergranular strain partition, and gives a first insight into the adequate formulation of the evolving parameters in a constitutive law of creep deformation.
Download or read book Principles of Rock Deformation written by Adolphe Nicolas and published by Springer Science & Business Media. This book was released on 1987-01-31 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physicists attempt to reduce natural phenomena to their essential dimensions by means of simplification and approximation and to account for them by defining natural laws. Paradoxically, whilst there is a critical need in geology to reduce the overwhelming field information to its essentials, it often re mains in an over-descriptive state. This prudent attitude of geologists is dictated by the nature of the subjects being consi dered, as it is often difficult to derive the significant parame ters from the raw data. It also follows from the way that geolo gical work is carried out. Geologists proceed, as in a police investigation, by trying to reconstruct past conditions and events from an analysis of the features preserved in rocks. In physics all knowledge is based on experiment but in the Earth Sciences experimental evidence is of very limited scope and is difficult to interpret. The geologist's cautious approach in accepting evidence gained by modelling and quantification is sometimes questionable when it is taken too far. It shuts out potentially fruitful lines of advance; for instance when refu sing order of magnitude calculations, it risks being drowned in anthropomorphic speculation. Happily nowadays, many more studies tend to separate and order the significant facts and are carried out with numerical constraints, which although they are approxi mate in nature, limit the range of hypotheses and thus give rise to new models.
Download or read book Intracrystalline Deformation of Calcite written by Johannes Hubertus Petrus de Bresser and published by Instituut Voor Aardwetenschappen Der Ri. This book was released on 1991 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mineral and Rock Deformation written by Bruce E. Hobbs and published by American Geophysical Union. This book was released on 1986 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deformation Structures and Processes within the Continental Crust written by S. Llana-Fúnez and published by Geological Society of London. This book was released on 2014-06-04 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a selection of papers showing the current focus of studies of deformation structures and processes within the continental crust. The selected contributions use a large range of analytical techniques suited to the full range of structure sizes and fine-tuned to the physical process that controls the deformation, from the grain boundary at the micro-scale, the lithological contact at the meso-scale to the plate boundary at the global scale. The papers in the volume are grouped into three sections relating to specific lines of research within the analysis of rock deformation structures and processes, in particular in respect to the continental crust: structures within shear zones and faults; magmatic structures, and microstructures and rheology. These sections include papers describing field studies, experimental rock deformation and numerical modelling of deformation processes.
Download or read book Creep of Crystals written by Jean-Paul Poirier and published by . This book was released on 1985 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook describes the physics of the plastic deformation of solids at high temperatures. It is directed at geologists or geophysicists interested in the high-temperature behaviour of crystals who wish to become acquainted with the methods of materials science in so far as they are useful to earth scientists. It explains the most important models and recent experimental results without losing the reader in the primary literature of materials science. In turn the book deals with the essential solid-state physics; thermodynamics and hydrostatics of creep; creep models and their applications in the geological sciences; diffusion creep; superplastic deformation and deformation enhanced by phase transformations. Five concluding chapters give experimental results for metals, ceramics and minerals. There are extensive bibliographies to aid further study.
Download or read book Deformation of the Continental Crust written by M. P. Coward and published by Geological Society of London. This book was released on 2007 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
