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Fabric asymmetry and shear sense in movement zones

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Zusammenfassung

Zwischen der gitterbedingten Orientierung und der formabhängigen Textur wird bei Mikrotextur-Untersuchungen von vielen deformierten Mineralaggregaten (z. B. Eis, Karbonatgesteine, Peridotite und Quartzite) gemeinhin eine Asymmetrie beobachtet.

Theoretische Vorhersagen sind durch den vereinfachten Ansatz der verfügbaren Modelle bedingt. Mehr Information läßt sich durch die Diskussion der Mechanismen gewinnen, die diese Asymmetrie bei bestimmten natürlichen und experimentellen Situationen verursachen. Neben anderen Ursachen ist die Asymmetrie häufig an die Art der Beanspruchung gekoppelt. Aus den Untersuchungen wird gefolgert, daß die Textur-Asymmetrie eine brauchbare Methode für die Analyse von Fließgefügen in natürlich deformierten Gesteinen darstellt.

Dieses gilt, solange die adäquaten Bedingungen für eine erfolgreiche Anwendung dieser Technik nachgewiesen sind und ihre Grenzen beachtet werden.

Abstract

Asymmetry between lattice preferred orientation and shape fabrics is commonly observed in microstructural studies of many deformed mineral aggregates (e. g. ice, carbonate rocks, peridotites and quartzites). Theoretical predictions are limited by the nature of the models available and more can be gained by discussion of the mechanisms which give rise to such asymmetry in specific natural and experimental situations.

Asymmetry is often related to the sense of shear but there are other factors to be considered as well. It is concluded that fabric asymmetry can be a useful tool for the analysis of flow regimes in naturally deformed rocks, as long as the conditions prerequisite to successful application of this technique can be shown to have existed, and cognizance is taken of the limitations of the technique.

Résumé

Les études microstructurales des agrégats cristallins déformés tels la glace, les cipolins, les péridotites et les quartzites mettent souvent en évidence une obliquité entre les orientations préférentielles de réseau et de forme des grains constitutifs. Les prédictions théoriques de cette obliquité sont limitées par la nature même du modèle choisi pour représenter l'agrégat et sa déformation: on pense qu'il y a plus à apprendre sur les mécanismes qui génèrent cette obliquité, en s'appuyant sur des exemples de déformation naturelle ou expérimentale. Le plus souvent, l'obliquité est directement liée au

Краткое содержание

При исследовании мик ротекстуры многих деформированных мин ералов, образующих аггрегат ы (напр,: лед, карбонатн ые породы, перидотиты, кварциты) наблюдают а симметрию между орие нтацией, обусловленной строением кристалли ческой решетки, и текс турой, зависящей от формы их.

Теоретические прогн озы ограничиваются у прощенным применением имеющих ся моделей. Более исчерп ывающие данные получ ают при рассматрении механизмов, вызывающ их эту асимметрию в ес тественных условиях, а также в условиях экспериме нта. Помимо многих дру гих причин, асимметрия связана с родом напряжения. Из опытов следует, что ас имметрия текстуры может быть является методо м, пригодным для иссле дования и анализе флюидальных структур, деформиров анных в естественных условиях.

Это правило действит елько только там, где д оказаны адекватные условия для успешного примен ил этого метода, не пер еходящие границы его возможно стей.

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Bouchez, J.L., Lister, G.S. & Nicolas, A. Fabric asymmetry and shear sense in movement zones. Geol Rundsch 72, 401–419 (1983). https://doi.org/10.1007/BF01822075

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