Metamorphic Reactions: Kinetics, Textures, and Deformation by M. A. Carpenter, A. Putnis (auth.), Alan Bruce Thompson,

By M. A. Carpenter, A. Putnis (auth.), Alan Bruce Thompson, David C. Rubie (eds.)

The fourth quantity during this sequence involves 11 chapters. the 1st 5 care for extra theoretical points of the kinetics and mechanisms of meta­ morphic reactions, and the subsequent six contemplate the interdependence of defor­ mation and metamorphism. All papers take care of usual methods that inter­ act on a number of time scales and with diversified levels of mass and warmth move. as a result, many basic axioms of metamorphic petrol­ ogy and structural geology are puzzled either for his or her accuracy and their usefulness. In elevating such questions, such a lot individuals have pointed to ways that the solutions might be imminent from applicable experi­ psychological stories or observations on normal fabrics. of their dialogue of ways order/disorder can impact mineral assem­ blages, wood worker and Putnis emphasize that metastable crystal development is usual in metamorphic platforms and kingdom' 'there will be a few reluctance (among many earth scientists) to just accept that major departures from equilibrium may possibly occur." at the foundation of awarded facts, they query no matter if reactions ever take place as regards to an equilibrium boundary. The neces­ sity for strain or temperature overstepping can also be required via nucleation­ price concept. as a minimum, the measure of order is seriously motivated by way of those kinetic results in igneous, sedimentary, and metamorphic environments.

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74,721-727. Schneider, H. (1976) The progressive crystallization and ordering of low-temperature dolomites. Mineral. Mag. 40, 579-487. , and Schairer, J. F. (1961) Compositions and structural states of anhydrous Mg-cordierites: A re-investigation of the central part of the system MgOAI 20 r Si02 • J. Petrol. 2, 324-406. , H. S. (1964) The system Mg-cordierite-H 20 and related rocks. N. Jb. Miner. Abh. 101, 271-342. Seil, M. , and Blencoe, J. G. (1979) Activity-composition relations of NaAISi3 0 gCaAl2Si2 0 g feldspars at 2kb, 600-800°C.

64) inferred that early site saturation occurs during the aragonite to calcite transformation. However, for reactions with a large volume change (A V), the reactant phase may become strained during the growth of the product phase (transformation strain, see below) with the consequent creation of new nucleation sites. For example, Carlson and Rosenfeld (1981, p. 624) reported fracturing of aragonite during the growth of calcite grains and the generation of new nuclei on the cracks (at P = 1 bar, T = 375-455°C).

Conclusion In this paper our intentions have been: first, to show that it is easy to rationalize the metastable growth behavior of crystals and show why disordered growth should frequently be favored over equilibrium, ordered growth; second, to show that there is plenty of evidence for such metastable behavior in nature; and, finally, to outline the circumstances in which this behavior could have a real control on observed mineral assemblages. Most 20 M. A. Carpenter and A. Putnis of the ideas and examples that we have presented are not new and can be found scattered around the literature.

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