Structure of the Abercrombie beds south of Reids Flat, New South Wales

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Authors:Morand, V. J.
Author Affiliations:Primary:
Univ. Sydney, Dep. Geol. and Geophys., Sydney, N.S.W, Australia
Volume Title:Australian Journal of Earth Sciences
Source:Australian Journal of Earth Sciences, 34(1), p.119-133. Publisher: Blackwell, Melbourne, Victoria, Australia. ISSN: 0812-0099
Publication Date:1987
Note:In English. 15 refs.; illus. incl. sect., geol. sketch map
Summary:The late Ordovician Abercrombie beds, S of Reids Flat, and adjacent to the Wyangala batholith, show evidence of three successive fold episodes. First-generation folds are tight to isoclinal, with fold axes ranging from vertical to horizontal and N-trending, and steep axial-plane slaty cleavage. Second- generation folds are steeply plunging, tight to open with N-striking axial planes. In pelitic rocks the axial plane structure is a crenulation cleavage which overprints the slaty cleavage. The first two fold episodes were accompanied by greenschist-facies metamorphism. Granite emplacement occurred prior to the second fold episode. A third deformation was of relatively mild intensity and produced open, N-trending folds with axial planes dipping moderately to the E, and crenulation cleavage as the axial plane structure in pelitic rocks. [N.C.N.S.]
Subjects:Axial-plane structures; Bedding; Cleavage; Facies; Folds; Greenschist facies; Isoclinal folds; Lineation; Metamorphic rocks; Metasedimentary rocks; Ordovician; Paleozoic; Pelitic texture; Planar bedding structures; Sedimentary structures; Structural analysis; Structural geology; Textures; Upper Ordovician; Australasia; Australia; New South Wales Australia; Abercrombie Beds; Abercrombie River; Reids Flat; Wyangala Batholith
Abstract Numbers:87M/6949
Record ID:1987074117
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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