Geochemistry and U-Pb zircon dating constraints of some plutonic rocks along Bir Tawilah shear zone,central Saudi Arabia: Implication for magma peterogenesis and age of gold mineralization |
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| Institution: | 1. School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK;2. Geological Survey of Northern Ireland, Colby House, Stranmillis Court, Belfast BT9 5BF, UK;3. Scottish Universities Environmental Research Centre, Rankine Avenue, Scottish Enterprise Technology Park, East Kilbride, G75 0QF, UK;4. School of Natural Sciences, Department of Geology, Trinity College, Dublin 2, Ireland;5. School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland;1. Geology Department, Faculty of Sciences, Mansoura University, Mansoura 35516, Egypt;2. Geology Department, Faculty of Sciences, Tanta University, Tanta, Egypt;3. Dept. of Geosciences, Swedish Museum of Natural History, Box 50007, SE-10405, Stockholm, Sweden;4. Department of Mineral Resources and Rocks, Faculty of Earth Sciences, King Abdulaziz University, P.O. Box 80206, Jeddah 21589, Saudi Arabia;5. Institut für Geographie und Geologie, Am Hubland, 97074 Würzburg, Germany;6. Norwegian Polar Institute, Tromsø, Norway |
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| Abstract: | The study area covered by this work is located along the Bir Tawilah fault zone which encompasses the Arabian Shield between Afif terrane and western oceanic terranes. The rocks are dominantly ophiolite assemblages, island arc metavolcanic and metasedimentary rocks, and dioritic to granitic intrusions. The diorite and granodiorite rocks are I-type granitoids, calk-alkaline, metaluminous to peraluminous, formed in a volcanic arc setting, whereas the monzogranite is classified as A-type granite, alkaline and highly fractionated calc-alkaline, generated in within-plate tectonic setting. Nb and Y relationships indicated that the diorites and granodiorites were generated by a mafic parental magma contaminated with crustal materials, and controlled by fractional crystallization, whereas the monzogranites were generated from a magma characterized by an enriched mantle (EM) source.Mineralization including gold is hosted by the carbonatized serpentinite (listvenite) and the syn-tectonic granodiorite along Bir Tawilah thrust zone. U-Pb zircon geochronology indicates that the granodiorite at Jabal Ghadarah is emplaced at ca. 630 ± 12 Ma, probably suggests that the metallic minerals associated with the granodiorite along Bir Tawilah thurst zone are the result of remobilization of pre-existing gold mineralization associated with listevenite that is related to arc accretion. |
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| Keywords: | U-Pb zircon dating Arabian shield Gold mineralization Bir Tawilah shear zone Arabian shield |
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