Accretion tectonics in northern Erithrea revealed by remotely sensed imagery
Article Abstract:
Remote sensing activities in the Pan-African continent of northern Erithrea has facilitated the recognition of major north-south trending strikeslip faults in the area. It allowed for the subdivision of Erithrea into three distinct terranes: Hagar made up of calc-alkaline volcano-sedimentary sequences, Nacfa terrane of migmatitic calc-alkaline granitoids and the Barka terrane made up of highly fractured layers of ophiolite-rich basic-ultrabasic complexes. The process of tectonic accretion was postulated to explain the origin of the complexes in the area.
Publication Name: Geological Magazine
Subject: Earth sciences
ISSN: 0016-7568
Year: 1993
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Podiform chromitite-bearing ultrabasic rocks from the Braganca massif, northern Portugal: fragments of island arc mantle?
Article Abstract:
A comparative study of chromite composition of the preserved podiform chromitites in Portugal's Braganca Massif, and chromite grains and supra-subduction zone ophiolites indicates pieces of depleted mantle to be the origin of the ultrabasic rocks from Braganca Massif. Rich contents of iron are found in the chromite composition, which is an indication of the island arc magma origin of the chromite. Mineralization of chromite and some melt extraction occurred in the ultrabasic rocks.
Publication Name: Geological Magazine
Subject: Earth sciences
ISSN: 0016-7568
Year: 1995
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Compressional and extensional tectonics in low-medium pressure granulites from the Larsemann Hills, East Antarctica
Article Abstract:
A cover sequence deposited on basement of mafic-felsic granulite is made of meta-sediments with a coherent stratigraphy, in the Larsemann Hills, East Antarctica. A tectonic interleaving occurred during a prograde, D1, thickening event. A metavolcanic origin, probably, in a mid-Proterozoic extensional basin related to volcanics is suggested by a metabasite intercalations confined to particular lithological units.
Publication Name: Geological Magazine
Subject: Earth sciences
ISSN: 0016-7568
Year: 1995
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- Abstracts: Patterns of late Cenozoic volcanic and tectonic activity in the West Antarctic rift system revealed by aeromagnetic surveys
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