Heterogeneous deformation and quartz crystallographic fabric transitions; natural examples from the Moine thrust zone at the Stack of Glencoul, northern Assynt

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doi: 10.1016/0191-8141(87)90083-6
Authors:Law, R. D.
Author Affiliations:Primary:
The Univ., Dep. Earth Sci., Leeds, United Kingdom
Volume Title:Journal of Structural Geology
Source:Journal of Structural Geology, 9(7), p.819-833. Publisher: Pergamon, Oxford-New York, International. ISSN: 0191-8141
Publication Date:1987
Note:In English. 40 refs.; illus. incl. 3 tables
Summary:A study was made of the quartz crystallographic transitions in well-exposed mylonites in this area. A progressive change is observed from asymmetrical kinked single girdle c-axis fabrics at 0.5 cm depth, through asymmetrical Type I cross-girdle fabrics, to symmetrical Type I cross-girdle fabrics at 30 cm beneath the thrust. This transition is accompanied by a change from asymmetrical single a-axis maximum fabrics, through asymmetrical two-maxima fabrics, to essentially symmetrical two-maxima axis fabrics. The transition is interpreted as indicating an increasing importance of non-coaxial plane-strain deformation as the Moine thrust is approached. Even <1 cm beneath the thrust, flow has departed from bulk simple shear and involved an important component of contemporaneous flattening deformation. [R.E.S.]
Subjects:Crystal structure; Deformation; Displacements; Fabric; Faults; Field studies; Framework silicates; Petrofabrics; Preferred orientation; Quartz; Silica minerals; Silicates; Structural geology; Symmetry; Thrust faults; Europe; Great Britain; Moine thrust zone; Scotland; United Kingdom; Western Europe; Stack of Glencoul
Abstract Numbers:88M/4702
Record ID:1988010360
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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