Reactivation of Archaean strike-slip fault systems, Amazon region, Brazil

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doi: 10.1144/gsjgs.154.1.0099
Authors:Pinheiro, Roberto V. L.; Holdsworth, Robert E.
Author Affiliations:Primary:
University of Durham, Department of Geological Sciences, Durham, United Kingdom
University of Durham, United Kingdom
Universidade Federal do Para, Brazil
Volume Title:role of basement reactivation in continental deformation
Volume Authors:Butler, R. W. H., editor; Holdsworth, R. E.; Lloyd, G. E.
Source:Journal of the Geological Society of London, Vol.154 (Part 1), p.99-103; Discussion meeting on The role of basement reactivation in continental deformation, Burlington House, United Kingdom, March 6-7, 1996, edited by R. W. H. Butler, R. E. Holdsworth and G. E. Lloyd. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1997
Note:In English. 22 refs.; illus., incl. sketch maps
Summary:The Itacaiunas belt on the SE margin of the Amazonian craton comprises two E-W-trending Archaean fault zones (Carajas and Cinzento strike-slip systems) developed sub-parallel to a broad zone of earlier ductile shearing. Older basement rocks display a pervasive E-W-trending mylonitic fabric, formed at high T during sinistral transpression at ∼ 2800 m.y. A sequence of younger Archaean cover rocks was deformed under low greenschist-facies conditions during a second phase of sinistral transpression associated with retrogression and reworking of basement fabrics. All these rocks are overlain unconformably by virtually unmetamorphosed volcanic and sedimentary rocks of late Archaean-early Proterozoic age. The Carajas and Cinzento strike-slip fault systems formed during subsequent regional dextral transtension (∼ 2600-2700 m.y.) which down-faulted cover sequence rocks into dilational fault jogs. [R.A.H.]
Subjects:Archean; Basement tectonics; Cratons; Deformation; Ductile deformation; Faults; Precambrian; Reactivation; Strike-slip faults; Tectonics; Transpression; Transtension; Amazon Basin; Brazil; Brazilian Shield; South America; Itacaiunas Belt
Abstract Numbers:97M/3008
Record ID:1997056631
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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