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- W2077316885 abstract "The crystalline basement outcrop exposed in southwest Jordan, is subdivided into two broad lithostratigraphic divisions, the older Aqaba complex and the Araba complex separated by a regional unconformity. The Aqaba complex principally comprises calc-alkaline plutonic rods of probable age range 630-580 Ma cut by extensive regional dyke swarms while the Araba complex is characterized by alkaline rhyolitic volcanics and minor coeval granites with an approximate age of 550-540 Ma. The plutonic rocks of the Aqaba complex are interpreted to be the products of subduction at, or dose to, a continental margin, while the Araba complex rods were most probably formed in an extensional setting. The Aqaba complex granitoids are isotopically primitive and were derived from a depleted source region like the mantle. The Arabian Shield of southwest Jordan provides an example of rapid crustal growth during the Neoproterozoic and the new data gives no support to models invoking the presence or involvement of significantly older basement in its development. Le socle cristallin affleurant dans le sud-ouest de la Jordanie est subdivisé en deux complexes lithostratigraphiques principaux qui sort séparés par une discordance régionale: le complexe d'Aqaba, le plus ancien, et le complexe d'Araba, le plus jeune. Le complexe d'Aqaba comprend principalement des ruches plutoniques calco alcalines d'âges probables compris entre 630 et 580 Ma qui sort recoupées par de grands faisceaux de filons régionaux. Le complexe d'Araba se caractérise par des rhyohtes alcalines et des granites contemporains en quantité mineure d'âges compris approximativement entre 550 et 540 Ma. Les ruches plutomques du complexe d'Agaba sont interprétés en tant que products de subduction sur ou près d'une marge coritinentale aloe: que les roches du complexe d'Araba se sort probablement formées dans un contexte extensif. Les granitoïdes du complexe d'Agaba possèdent une signature isotopique primitive et proviennent dune source appauvne tel le manteau. Le Boucher arabique du sud-ouest de la Jordanie four-it un example de croissance crustale rapide à la fin du Protérozdïque. Ces nouvelles données ne confirment donc pas les modèles invoquant la présence ou la participation d'un socle significativement plus vieux dans la formation de ces deux complexes." @default.
- W2077316885 created "2016-06-24" @default.
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- W2077316885 date "1995-02-01" @default.
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- W2077316885 title "Neoproterozoic granitic magmatism and tectonic evolution of the northern Arabian Shield: evidence from southwest Jordan" @default.
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- W2077316885 doi "https://doi.org/10.1016/0899-5362(95)00037-t" @default.
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