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Accretion tectonics in northern Eritrea revealed by remotely sensed imagery

Drury, S. A. and Berhe, S. M. (1993). Accretion tectonics in northern Eritrea revealed by remotely sensed imagery. Geological Magazine, 130(2) pp. 177–190.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1017/S0016756800009845
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Abstract

New details from remotely sensed images of the structure and disposition of broad lithological variations in the Pan-African of northern Eritrea are discussed in the context of accretionary tectonics. The recognition of major north-south structural discontinuities allows the area to be divided into three discrete terranes with apparently different histories of deformation and metamorphism, magmagenesis and sedimentation. The central Hagar Terrane is dominated by large ultramafic masses with a volcano-sedimentary layered sequence, and shows the effects of major sinistral transpression and lateral expulsion. It is bounded to the west by a major fault, the Barka suture, and abuts the older Barka Terrane that comprises metasediments with evidence for polyphase ductile deformation and pre-kinematic dyke emplacement. The Hagar Terrane is thrust against the eastern Nacfa Terrane, which is dominated by low-grade calc-alkaline metavolcanics and immature volcanoclastic sediments intruded by syn-kinematic plutons. These units are pre-dated by an earlier high-grade basement and post-dated by high-level unmetamorphosed silicic volcanics and redbed sediments. The complex is suggested to have been assembled by oblique accretion from the southeast after arc volcanism in the Nacfa Terrane and back-arc extension in the Hagar Terrane ended with the cease of subduction.

Item Type: Journal Article
Copyright Holders: 1993 Cambridge University Press
ISSN: 1469-5081
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetA consortium of non-governmental organizations engaged in relief operations in Eritrea
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Item ID: 25458
Depositing User: Stephen Drury
Date Deposited: 27 Apr 2011 14:22
Last Modified: 15 Nov 2011 10:02
URI: http://oro.open.ac.uk/id/eprint/25458
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