The Wadi Hodein area contains a wide variety of late Precambrian igneous and metamorphic rocks, represented by gneisses, serpentinites, metagabbros, metasediments, metavolcanics, metagabbro-diorite, granodiorite and granitoids. The Wadi Hodein metavolcanics (WHV), including G. Khashab and G. El Anbat, represent one of the significant metavolcanic suites in the southern part of the Nubian Shield...

In this paper we classify the range of feldspathic igneous rocks using five geochemical variables: the FeO/(FeOþMgO) ratio or Fe-index, the modified alkali^lime index, the aluminum-saturation index, the alkalinity index, and the feldspathoid silica-saturation index.The Fe-index distinguishes between melts that have undergone extensive iron enrichment during differentiation from those that have ...

A comprehensive one-dimensional photochemical model extending from the middle atmosphere (50 km) to the exobase (432 km) has been used to study the escape of hydrogen and deuterium from the Earth's atmosphere. The model incorporates recent advances in chemical kinetics as well as atmospheric observations by satellites, especially the Atmosphere Explorer C satellite. The results suggest: (1) ...

A comparative petrological study was conducted on the columnar joints of Guryongpo, Pohang, Yangnam, Gyeongju, and Gangdong-hwaam, Ulsan in Cenozoic Miocene sedimentary basin. Horizontal joints, these are characteristically developed, cross-sectional shape each joint is predominantly quadrilateral pentagonal Guryongpo Yangnam to hexagonal Gangdong-hwaam joint. As a result XRF analysis, it confi...

Introduction: The North Qilian orogenic belt, as the Northern branch of original Tethys tectonic domain, is important for reconstructing evolution ancient Tethys. However, history belt remains controversial. This study addresses this issue from a geochemical perspective. Methods: In study, comprehensive analysis geochronology, whole-rock geochemistry, clinopyroxene mineral zircon Ti crystalliza...