Petrologic and geochemical characterization and mineralization of the metavolcanic rocks of the Heib

• 作 者: Ibrahim H.Khalifa Mohammed Z.El-Bialy Doa'a M.Hassan
• 机 构: Geology Department,Faculty of Science,Suez Canal University,Ismailia 41522,Egypt,Geology Department,
• 出 处: Geoscience Frontiers
• 发表日期: 2011年03期
• 关键词: Calc-alkaline Sulphides Mineralization Metavolcanic rocks Sinai

Metavolcanic rocks hosting base metal sulphide mineralization,and belonging to the Kid Metamorphic Complex,are exposed in the Samra-Tarr area,Southern Sinai.The rocks consist of slightly metamorphosed varicolored porphyritic lavas of rhyolite-to-andesite composition,and their equivalent pyroclastics.Geochemically,these metavolcanics are classified as high-K calc-alkaline,metaluminous andesites,trachyandesites,dacites,and rhyolites.The geochemical characteristics of these metavolcanics strongly point to their derivation from continental crust in an active continental margin.The sulphide mineralization in these metavolcanics occurs in two major ore zones,and is represented by four distinct styles of mineralization.The mineralization occurs either as low-grade disseminations or as small massive pockets.The associated hydrothermal alterations include carbonatization,silicification,sericitization and argillic alterations.The base metal sulphide mineralization is epigenetic and was formed by hydrothermal solutions associated with subduction-related volcanic activity.

Metavolcanic rocks hosting base metal sulphide mineralization, and belonging to the Kidney Metamorphic Complex, are exposed in the Samra-Tarr area, Southern Sinai. The rocks consist of slightly metamorphosed varicolored porphyritic lavas of rhyolite-to-andesite composition, and their equivalent pyroclastics. Geochemically, these metavolcanics are classified as high-K calc-alkaline, metaluminous andesites, trachyandesites, dacites, and rhyolites. The geochemical characteristics of these metavolcanics strongly point to their derivation from continental crust in an active continental margin. The sulphide mineralization in these metavolcanics occurs in two major ore zones, and is represented by four distinct styles of mineralization. The mineralization occurs either as low-grade disseminations or as small massive pockets. The associated hydrothermal alterations include carbonatization, silicification, sericitization and argillic alterations. The base metal sulphide mineralization is epigenetic and was formed by hydrothermal solutions associated with subduction-related volcanic activity.