Equilibrium and Kinetics in Contact Metamorphism

Equilibrium and Kinetics in Contact Metamorphism

Author: Gerhard Voll

Publisher: Springer Science & Business Media

ISBN: 9783642761454

Category: Science

Page: 484

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With the new global tectonics approach in the Earth Sciences, the quan titative aspects of the dynamics of rock-forming processes came into focus: geologists are no longer satisfied knowing the pressure-tempera ture conditions of the formation of a metamorphic rock or of the emplace ment of a magmatic body, but instead would like to learn the time history of these rocks as well, i. e. , derive the temperature-pressure-time path and relate it to a tectonic process. To achieve this goal, a knowledge of both pressure-temperature-dependent equilibria and the time scales at which these equilibria may be attained are essential. However, the latter kinetic information is much more difficult to retrieve than that on equilibria: whereas equilibria are controlled by state variables, and proper laboratory experiments may be directly applied to equilibrium natural assemblages, kinetics also depends on factors other than state variables, such as grain size, dislocation density, and especially time (rate of heating, duration of annealing, rate of cooling). Extrapolation of kinetic data obtained at high temperatures on laboratory time scales to more realistic lower tempera tures and geological time scales are dangerous because, for example, of possible changes from an intrinsically controlled defect regime to an extrinsic one as temperature is lowered, or from an interface-controlled to a diffusion-controlled reaction mechanism.
Equilibrium and Kinetics in Contact Metamorphism
Language: en
Pages: 484
Authors: Gerhard Voll, Jutta Töpel, David R.M. Pattison, Friedrich Seifert
Categories: Science
Type: BOOK - Published: 2012-12-06 - Publisher: Springer Science & Business Media

With the new global tectonics approach in the Earth Sciences, the quan titative aspects of the dynamics of rock-forming processes came into focus: geologists are no longer satisfied knowing the pressure-tempera ture conditions of the formation of a metamorphic rock or of the emplace ment of a magmatic body, but
Contact Metamorphism
Language: en
Pages: 688
Authors: Derrill M. Kerrick
Categories: Science
Type: BOOK - Published: 2018-12-17 - Publisher: Walter de Gruyter GmbH & Co KG

Volume 26 of Reviews in Mineralogy provides a multidisciplinary review of our current knowledge of contact metamorphism. As in any field of endeavor, we are provided with new questions, thereby dictating future directions of study. Hopefully, this volume will provide inspiration and direction for future research on contact metamorphism. The
Deformation Structures and Processes within the Continental Crust
Language: en
Pages: 239
Authors: S. Llana-Fúnez, A. Marcos, F. Bastida
Categories: Science
Type: BOOK - Published: 2014-06-04 - Publisher: Geological Society of London

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,
Introduction to Metamorphic Textures and Microstructures
Language: en
Pages: 290
Authors: Barker, A.J. (Department of Geology, University of Southampton)
Categories: Science
Type: BOOK - Published: 2013-12-19 - Publisher: Routledge

A text which aims to help undergraduate students in geology to recognize and interpret metamorphic textures and microstructures in thin-section. For lecturers and postgraduates in geology and petrology, the book provides reference for the interpretation of metamorphic rocks.
The Nature and Models of Metamorphism
Language: en
Pages: 330
Authors: Vladimir V. Reverdatto, Igor I. Likhanov, Oleg P. Polyansky, Valentin S Sheplev, Vasiliy Yu Kolobov
Categories: Science
Type: BOOK - Published: 2018-12-31 - Publisher: Springer

This book presents the genetic connections of metamorphism and geodynamics. It discusses the tectonic and magmatic processes as the reason of metamorphism, and the geological types of metamorphism, which define the features of Р-Т parameters and Р-Т-t paths. Three categories of metamorphism are distinguished depending on the heat flow rate: