Textural map units in quartzo-feldspathic mylonitic rocks

Saved in:
Online Access: Get full text
doi: 10.1139/e87-195
Authors:Hanmer, Simon
Author Affiliations:Primary:
Geol. Surv. Can., Ottawa, ON, Canada
Volume Title:Canadian Journal of Earth Sciences Revue Canadienne des Sciences de la Terre
Source:Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre, 24(10), p.2065-2073. Publisher: National Research Council of Canada, Ottawa, ON, Canada. ISSN: 0008-4077
Publication Date:1987
Note:In English with French summary. Geol. Surv. Can.; Contrib. No. 47086. 32 refs.; illus. incl. geol. sketch maps
Summary:The initial mapping and process-oriented study of the textural evolution of mylonites in wide, deep-seated, crustal-scale shear zones are hampered by the inflexibility of the tripartite textural classification of mylonites. The classical protomylonite → mylonite → ultramylonite textural path is only one of several possible paths. The terms 'homoclastic' and 'heteroclastic', which refer to grain-size distribution in the porphyroclast population of the mylonitic rocks, introduce greater flexibility to the classification without altering its fundamental basis. They allow the description of textural paths other than PMU and enable the map maker to consider the textural development of mylonites in terms of the partitioning of the bulk imposed strain rate between the constituent grains of the rocks, rather than simply as a function of increasing finite strain. [J.M.H.]
Subjects:Cartography; Classification; Deformation; Effects; Faults; Feldspar group; Field studies; Framework silicates; Grain size; Interpretation; Maps; Metamorphic rocks; Mineral assemblages; Mylonites; Nomenclature; Petrofabrics; Petrology; Porphyroclastic texture; Quartz; Shear zones; Silica minerals; Silicates; Strain; Structural analysis; Structural geology; Structural maps; Textures; Ultramylonite; Heteroclastic texture; Homoclastic texture; Protomylonite
Abstract Numbers:88M/4693
Record ID:1987083581
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Tags: Add Tag
No Tags, Be the first to tag this record!

Similar Items