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- W2016802941 abstract "The Adobha Belt consists largely of metamorphosed volcanic and sedimentary sequences and syntectonic granitoids. Identification of the ancient tectonic setting of the belt has been attempted using trace element (including rare earth element) geochemical data on igneous suites. The Himbol volcanics of the Nakfa Terrane represent a calc-alkaline island-arc setting, while the Uogame basalts and associated gabbros characterise a tholeiitic, transitional MORB setting. The chemistry and petrographic features of the basalts and gabbros clearly suggest that they are parts of a dismembered ophiolite. Other authors' work shows that further to the west, the Hager Terrane belongs to a calc-alkaline island-arc setting. The Uogame ophiolitic suite thus portrays a MORB crust sandwiched between two island-arc terranes. Based on the fact that the MORB-type crust occurs within a high strain zone that extends for several hundreds of kilometres along strike, it is concluded here that it represents a terrane-bounding Neoproterozoic ophiolite belt. It is further suggested that this belt might outline a suture that signifies the collision between the island-arcs.La chaîne d'Adobha est formée largement par des séquences volcaniques et sédimentaires métamorphisées et des granitoïdes syntectoniques. L'identification du paléo-contexte tectonique de la chaîne a été tentée à partir des données géochimiques sur les éléments en traces (y compris les terres rares) des suites magmqtiques. Dans le Terrane de Nafka, les roches volcaniques de Himbol représentent un contexte d'arc insulaire calco-alcalin, alors que les basaltes d'Uogame et les gabbros associés caractérisent un contexte tholéiitique à transitionnel de MORB. La chimie et les caractères pétrographiques des basaltes et des gabbros suggèrent clairement leur participation à une ophiolite démembrée. Les travaux d'autres auteurs montrent que, plus à l'ouest, le Terrane de Hager appartient à un contexte d'arc insulaire calco-alcalin. La suite ophiolitique d'Uogame montre donc une croûte de type MORB en sandwich entre deux arcs insulaires. Comme la croûte de type MORB affleure dans une zone fortement déformée qui s'étend sur plusieurs centaines de kilomètres de longueur, je conclus qu'elle représente une ceinture ophiolitique néoprotérozoïque entre deux terranes. Je suggère de plus que cette ceinture a pu constituer une suture, ce qui signifie la collision entre les arcs insulaires." @default.
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- W2016802941 date "2010-12-01" @default.
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- W2016802941 title "Atteinte hépatique au cours de la sarcoidose : à propos de 15 cas" @default.
- W2016802941 doi "https://doi.org/10.1016/j.revmed.2010.10.324" @default.
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