Journal ArticleDOI
Deformation Mechanics of Mylonitic Rocks and Fractured Granites in Cobequid Mountains, Nova Scotia, Canada
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In this paper, a regional compression axis, inferred from a laminar flow model for the mylonite zone, is compatible with a compression axis derived from slickensided fractures in granitic rocks north of the mylanite zone.Abstract:
Mylonitization in the southern part of the Cobequid Mountains resulted from deformation of igneous and sedimentary rocks during the Devonian Acadian orogeny. Detailed analyses of mineral lineation, penetrative s-surfaces, and mineral grain fabrics suggest that uniform tectonic flow within the mylonite zone produced rock strains with extension parallel to the mineral lineation. Quartz fabrics originated when large quartz crystals deformed into elongate granular aggregates. A regional compression axis, inferred from a laminar flow model for the mylonite zone, is compatible with a compression axis derived from slickensided fractures in granitic rocks north of the mylonite zone. The subhorizontal, southeasterly trending compression axes are perpendicular to the regional trend of the Appalachians mountain chain in Nova Scotia.read more
Citations
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Journal ArticleDOI
The Ailao Shan-Red River shear zone (Yunnan, China), Tertiary transform boundary of Indochina
Philippe Hervé Leloup,Robin Lacassin,Paul Tapponnier,Urs Schärer,Dalai Zhong,Xiaohan Liu,Liangshang Zhang,Shaocheng Ji,Phan Trong Trinh +8 more
TL;DR: In this paper, Wang et al. showed that the Ailao and Diancang Shan metamorphic cores are composed of strongly foliated and lineated mylonitic gneisses.
Journal ArticleDOI
S-C Mylonites
Gordon S. Lister,A.W. Snoke +1 more
TL;DR: Berthe et al. as mentioned in this paper proposed two types of foliations in mylonites and mylonitic rocks: (a) S-surfaces related to the accumulation of finite strain and (b) C-surface related to displacement discontinuities or zones of relatively high shear strain.
Book ChapterDOI
Complete Fabric Analysis of Some Commonly Observed Quartz C-Axis Patterns
Stefan M. Schmid,Martin Casey +1 more
Porphyroclast systems as kinematic indicators
Carol Simpson,Cees W. Passchier +1 more
TL;DR: In this article, two classes of porphyroclast systems with monoclinic symmetry have been identified on geometrical grounds: sigma-type porphyra clasps and delta-clasps, characterized by wedge-shaped tails of recrystallized material.
Journal ArticleDOI
Porphyroclast systems as kinematic indicators
Cees W. Passchier,Carol Simpson +1 more
TL;DR: The geometry of a porphyroclast and its tails can serve as a valuable indicator of the sense of vorticity as discussed by the authors, which can be used as a measure of porphyric properties.
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