G of Neeochemistry and petrogenesisoproterozoic Nuqara Dokhan volcanics, Central Eastern Desert, Egypt
The Neoproterozoic Nuqara Dokhan volcanics are distinguished into two main groups: a) intermediate volcanics that comprised basaltic andesites, andesites and their associated pyroclastics, b) felsic volcanics, consisting of dacite, rhyodacite, rhyolites and ignimbrites.. Their major and trace elements have a wide ranges in which SiO2 (76-54%), CaO (8.95-0.2%), TiO2 (1.6-0.4%), Sr (97-52 ppm), Zr (40-160 ppm), Cr (231-4 ppm), and ... Read more