Did the Dalradian slides originate as extensional faults?

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Authors:Soper, N. J.; Anderton, R.
Author Affiliations:Primary:
Univ. Sheffield, Dep. Geol., Sheffield, United Kingdom
Other:
Univ. Strathclyde, United Kingdom
Volume Title:Nature (London)
Source:Nature (London), 307(5949), p.357-360. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836
Publication Date:1984
Note:In English. 39 refs.; illus. incl. sects., geol. sketch map
Summary:Rocks of the Dalradian supergroup of Scotland and Ireland were deposited in Late Proterozoic-Early Cambrian times on what became the southern margin of the Laurentian plate, and underwent metamorphism and deformation when this margin was affected by the Grampian orogeny in the Late Cambrian. The resulting complex structure is still not fully understood, and a continuing problem is presented by the origin and significance of the 'slides', a series of ductile faults which lie sub-parallel to the bedding. It is generally assumed that these slides are syn-metamorphic and were formed during Grampian deformation. However, a consideration of their geometry, stratigraphic relationships and context now suggests that they may have been initiated as syn-depositional extensional faults which were only modified, and not formed, during the Grampian orogeny. [T.R.]
Subjects:Caledonian Orogeny; Cambrian; Dalradian; Extension faults; Extension tectonics; Faults; Folds; Grampian Orogeny; Gravity sliding; Interpretation; Mechanism; Neoproterozoic; Ordovician; Orogeny; Paleozoic; Precambrian; Proterozoic; Structural geology; Syntectonic processes; Tectonics; Upper Precambrian; Caledonides; Europe; Grampian Highlands; Great Britain; Scotland; Scottish Highlands; United Kingdom; Western Europe
Coordinates:N551500 N574500 W0014500 W0055000
Abstract Numbers:84M/4311
Record ID:1984045954
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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