Moine Thrust zone mylonites at the Stack of Glencoul: I – microstructures, strain and influence of recrystallization on quartz crystal fabric development

Author:

Law R. D.1,Mainprice D.2,Casey M.34,Lloyd G. E.3,Knipe R. J.3,Cook B.15,Thigpen J. R.1

Affiliation:

1. Department of Geosciences, Virginia Tech., Blacksburg, VA 24061, USA

2. Géosciences Montpellier UMR CNRS 5243, Université Montpellier II, 34095 Montpellier, France

3. School of Earth and Environment, The University, Leeds LS2 9JT, UK

4. deceased

5. Present address: Department of Earth and Environmental Sciences, University of Kentucky, Lexington, Kentucky 40506, USA

Abstract

AbstractSince the early descriptions published by Callaway in 1884, the gently dipping mylonites exposed along the Moine Thrust at the Stack of Glencoul have drawn generations of geologists to the northern part of the Assynt district. These mylonites, derived from Cambrian quartzites (footwall) and Moine pelites and psammites (hanging wall), have figured prominently in: a) early research into the influence of crystal plastic deformation and recrystallization on microstructural and crystal fabric evolution; b) debates on the kinematic interpretation of macro- and micro-structures and crystal fabrics; and c) debates on the tectonic significance of such kinematic data. In this paper first we briefly review the historical aspects of this research and then, using both previously published and unpublished data, document the finite strain and quartz fabric development at this classic mylonite locality. A tectonic interpretation of these data, together with quantitative estimates of flow vorticities associated with mylonite formation at the Stack of Glencoul, are presented in a companion paper by Law (2010).

Publisher

Geological Society of London

Subject

Geology,Ocean Engineering,Water Science and Technology

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