Tholeiite derivative dyke swarms near Erkowit,Red Sea Hills,Sudan |
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Authors: | Dr J R Vail Mr D J Hughes |
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Institution: | (1) Present address: Department of Geology, Portsmouth Polytechnic, Portsmouth, England |
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Abstract: | Extensive dyke swarms have been identified in basement rocks inland from Suakin with NW, N-S, and E-W trends. Petrographic examination and the results of ten XRF analyses of dykes near Erkowit indicate that they belong to a tholeiitic hornblende microgabbro-microdiorite suite. Eight whole rock K-Ar isotopic analyses suggest two possible periods of emplacement at 616±18 Ma. and 660±19 Ma. ago. These are the first geochemical-geochronological data for Sudanese dykes, and suggest an association with the N.E. African igneous ring-complex province.
Zusammenfassung Ausgedehnte Ansammlungen von Gängen in nordwestlichen, nord-südlichen und ostwestlichen Richtungen wurden im Grundgebirge landeinwärts von Suakin festgestellt. Eine petrographische Überprüfung und die Ergebnisse von zehn XRF-Analysen von Gängen in der Nähe von Erkowit deuten auf eine tholeiitische Homblende-Mikrogabbro-Mikrodiorit-Gruppe hin. Acht K/Ar-Isotopenanalysen legen zwei mögliche Entstehungsperioden um 616±18 Millionen Jahre und 660±19 Millionen Jahre nahe. Dies sind die ersten geochemisch-geochronologischen Daten für sudanesische Gänge; sie weisen auf eine Verbindung mit der nordostafrikanischen plutonischen Ringkomplex Region hin.
Résumé On a compilé de grands ensembles de dykes dans le socle de l'intérieur de Suakin. Ils sont orientés N.O.-S.E., N-S et E-O. Les examens pétrographiques et les résultats de dix analyses par fluorescence X, des dykes dans la région d'Erkowit indiquent leur apparartenance à une suite tholéiitique de microgabbro ou microdiorite à hornblende. Huit analyses isotropiques de la roche totale par la méthode K-Ar suggérent deux possibilités de la période d'emplacement, 616±18 Ma et 660±19 Ma. Ces premiers éléments d'information géochimiques et géochronologiques concernant les dykes soudanais suggérent une association avec la province du ring-complex du N.E. Africain.
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![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![rcy](/content/j4l17r8275r77154/xxlarge1088.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![dcy](/content/j4l17r8275r77154/xxlarge1076.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![bcy](/content/j4l17r8275r77154/xxlarge1073.gif) ![rcy](/content/j4l17r8275r77154/xxlarge1088.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) ![zcy](/content/j4l17r8275r77154/xxlarge1079.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![vcy](/content/j4l17r8275r77154/xxlarge1074.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) : 616±18 ![mcy](/content/j4l17r8275r77154/xxlarge1084.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![tcy](/content/j4l17r8275r77154/xxlarge1090.gif) ![mcy](/content/j4l17r8275r77154/xxlarge1084.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) ![khcy](/content/j4l17r8275r77154/xxlarge1093.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) 660±19 ![mcy](/content/j4l17r8275r77154/xxlarge1084.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![tcy](/content/j4l17r8275r77154/xxlarge1090.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![mcy](/content/j4l17r8275r77154/xxlarge1084.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) ![zcy](/content/j4l17r8275r77154/xxlarge1079.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) . ![Ecy](/content/j4l17r8275r77154/xxlarge1069.gif) ![tcy](/content/j4l17r8275r77154/xxlarge1090.gif) ![pcy](/content/j4l17r8275r77154/xxlarge1087.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![rcy](/content/j4l17r8275r77154/xxlarge1088.gif) ![vcy](/content/j4l17r8275r77154/xxlarge1074.gif) ![ycy](/content/j4l17r8275r77154/xxlarge1099.gif) ![gcy](/content/j4l17r8275r77154/xxlarge1075.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![mcy](/content/j4l17r8275r77154/xxlarge1084.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![chcy](/content/j4l17r8275r77154/xxlarge1095.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![scy](/content/j4l17r8275r77154/xxlarge1089.gif) ![kcy](/content/j4l17r8275r77154/xxlarge1082.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![gcy](/content/j4l17r8275r77154/xxlarge1075.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![khcy](/content/j4l17r8275r77154/xxlarge1093.gif) ![rcy](/content/j4l17r8275r77154/xxlarge1088.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![gcy](/content/j4l17r8275r77154/xxlarge1075.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![chcy](/content/j4l17r8275r77154/xxlarge1095.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![scy](/content/j4l17r8275r77154/xxlarge1089.gif) ![kcy](/content/j4l17r8275r77154/xxlarge1082.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![dcy](/content/j4l17r8275r77154/xxlarge1076.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![ycy](/content/j4l17r8275r77154/xxlarge1099.gif) ![zhcy](/content/j4l17r8275r77154/xxlarge1078.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) ![Scy](/content/j4l17r8275r77154/xxlarge1057.gif) ![ucy](/content/j4l17r8275r77154/xxlarge1091.gif) ![dcy](/content/j4l17r8275r77154/xxlarge1076.gif) ![ucy](/content/j4l17r8275r77154/xxlarge1091.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ; ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![ucy](/content/j4l17r8275r77154/xxlarge1091.gif) ![kcy](/content/j4l17r8275r77154/xxlarge1082.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) ![zcy](/content/j4l17r8275r77154/xxlarge1079.gif) ![ycy](/content/j4l17r8275r77154/xxlarge1099.gif) ![vcy](/content/j4l17r8275r77154/xxlarge1074.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) ![yucy](/content/j4l17r8275r77154/xxlarge1102.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![pcy](/content/j4l17r8275r77154/xxlarge1087.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![scy](/content/j4l17r8275r77154/xxlarge1089.gif) ![rcy](/content/j4l17r8275r77154/xxlarge1088.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![dcy](/content/j4l17r8275r77154/xxlarge1076.gif) ![scy](/content/j4l17r8275r77154/xxlarge1089.gif) ![tcy](/content/j4l17r8275r77154/xxlarge1090.gif) ![vcy](/content/j4l17r8275r77154/xxlarge1074.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![ucy](/content/j4l17r8275r77154/xxlarge1091.gif) ![scy](/content/j4l17r8275r77154/xxlarge1089.gif) ![vcy](/content/j4l17r8275r77154/xxlarge1074.gif) ![yacy](/content/j4l17r8275r77154/xxlarge1103.gif) ![zcy](/content/j4l17r8275r77154/xxlarge1079.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![bcy](/content/j4l17r8275r77154/xxlarge1073.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) ![scy](/content/j4l17r8275r77154/xxlarge1089.gif) ![tcy](/content/j4l17r8275r77154/xxlarge1090.gif) ![softcy](/content/j4l17r8275r77154/xxlarge1100.gif) ![scy](/content/j4l17r8275r77154/xxlarge1089.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![vcy](/content/j4l17r8275r77154/xxlarge1074.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![rcy](/content/j4l17r8275r77154/xxlarge1088.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) ![fcy](/content/j4l17r8275r77154/xxlarge1092.gif) ![rcy](/content/j4l17r8275r77154/xxlarge1088.gif) ![kcy](/content/j4l17r8275r77154/xxlarge1082.gif) ![acy](/content/j4l17r8275r77154/xxlarge1072.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![scy](/content/j4l17r8275r77154/xxlarge1089.gif) ![kcy](/content/j4l17r8275r77154/xxlarge1082.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![gcy](/content/j4l17r8275r77154/xxlarge1075.gif) ![pcy](/content/j4l17r8275r77154/xxlarge1087.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![ucy](/content/j4l17r8275r77154/xxlarge1091.gif) ![tcy](/content/j4l17r8275r77154/xxlarge1090.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![ncy](/content/j4l17r8275r77154/xxlarge1085.gif) ![icy](/content/j4l17r8275r77154/xxlarge1080.gif) ![chcy](/content/j4l17r8275r77154/xxlarge1095.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![scy](/content/j4l17r8275r77154/xxlarge1089.gif) ![kcy](/content/j4l17r8275r77154/xxlarge1082.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![gcy](/content/j4l17r8275r77154/xxlarge1075.gif) ![kcy](/content/j4l17r8275r77154/xxlarge1082.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![tscy](/content/j4l17r8275r77154/xxlarge1094.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![vcy](/content/j4l17r8275r77154/xxlarge1074.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![gcy](/content/j4l17r8275r77154/xxlarge1075.gif) ![kcy](/content/j4l17r8275r77154/xxlarge1082.gif) ![ocy](/content/j4l17r8275r77154/xxlarge1086.gif) ![mcy](/content/j4l17r8275r77154/xxlarge1084.gif) ![pcy](/content/j4l17r8275r77154/xxlarge1087.gif) ![lcy](/content/j4l17r8275r77154/xxlarge1083.gif) ![iecy](/content/j4l17r8275r77154/xxlarge1077.gif) ![kcy](/content/j4l17r8275r77154/xxlarge1082.gif) ![scy](/content/j4l17r8275r77154/xxlarge1089.gif) .
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