The metamorphic architecture of a transpression orogen; the Kaoko Belt, Namibia

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doi: 10.1093/petrology/44.4.679
Authors:Goscombe, Ben; Hand, Martin; Gray, David; Mawby, Jo
Author Affiliations:Primary:
University of Adelaide, Department of Geology and Geophysics, Adelaide, South Aust., Australia
Other:
University of Melbourne, Australia
Volume Title:Journal of Petrology
Source:Journal of Petrology, 44(4), p.679-711. Publisher: Oxford University Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:2003
Note:In English. 103 refs.; illus., incl. charts, 2 tables, geol. sketch maps
Summary:The Kaoko Belt has three segments: 1) an eastern zone of upright folded Damaran Neoproterozoic shelf carbonates; 2) a central zone of inverted Barrovian metamorphic rocks with east-vergent nappes and 3) a western zone of high-grade metamorphic rocks, intruded by granites, with strike-slip ductile shear zones and isograds indicative of extrusional tectonics in an orogen core. A protracted Pan-African orogeny of late Neoproterozoic to early Cambrian age was involved with clockwise P-T-t paths and a half-flower structure centred on the crustal-scale Purros mylonite zone. The metamorphic phase, T and P and timing (garnet Sm-Nd geochronology; 576 ± 15 m.y.) are deduced in some detail and chemical analyses of garnets, cordierites, biotites, muscovites, chlorites, plagioclases and staurolites are electronically tabulated. [B.E.L.]
Sections:Petrology
Subsections:Metamorphism: regional, dynamic
Subjects:Amphibolites; Deformation; Ductile deformation; Faults; Fold and thrust belts; Granulites; Metamorphic rocks; Mylonites; Nappes; Orogenic belts; Orogeny; Shear zones; Strike-slip faults; Tectonics; Transpression; Africa; Kaoko Belt; Namibia; Southern Africa; Purros mylonite zone
Coordinates:S200000 S180000 E0140000 E0120000
Abstract Numbers:03M/3367
Record ID:2003043949
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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