Accretionary lapilli-filled clastic dykes; a comparison of compaction strain estimates from dyke folding and lapilli shape factors

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doi: 10.1016/0191-8141(86)90110-0
Authors:Boulter, C. A.
Author Affiliations:Primary:
Univ. Nottingham, Dep. Geol., Nottingham, United Kingdom
Volume Title:Journal of Structural Geology
Source:Journal of Structural Geology, 8(2), p.201-204. Publisher: Pergamon, Oxford-New York, International. ISSN: 0191-8141
Publication Date:1986
Note:In English. 6 refs.; illus. incl. 2 plates
Summary:Within pyroclastic and tuffaceous sediments of the late Archaean Fortescue group, Western Australia, small-scale clastic dykes have been infilled by accretionary lapilli. This unusual occurrence allows quantification of compaction by two independent means using the folded nature of the dykes and the shape factors of the accretionary lapilli. The dyke-folded method consistently gives a much lower estimate of the compaction strain than the accretionary lapilli. Two dykes giving shortening of 20 and 2% by the dyke method both contain accretionary lapilli recording 40% compaction. (Author's abstract) [J.M.H.]
Subjects:Archean; Clastic dikes; Clastic rocks; Compaction; Folds; Fortescue Group; Igneous rocks; Lapilli; Petrofabrics; Porosity; Precambrian; Preferred orientation; Pyroclastics; Sedimentary petrology; Sedimentary rocks; Sedimentary structures; Soft sediment deformation; Strain; Structural analysis; Tuff; Volcanic rocks; Australasia; Australia; Hamersley Basin; Western Australia
Abstract Numbers:86M/5198
Record ID:1986061391
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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