The muscovite granites at the study area are being emplaced into biotite and ophiolitic mélange settings. They occur in four exposures namely; Umm Seleimat, Sikait, El Kheran Addebaa exposure. presence of garnet flakes may reflect peraluminous nature studied granites. Petrographically, mostly subsolvus consist plagioclase, K-feldspars, quartz, biotite. Garnet, zircon, allanite opaques accessori...

Mineral weathering in soils is an important source of many nutrients to forest ecosystems. Apatite, a Ca phosphate mineral, occurs in trace amounts in virtually all igneous and metamorphic rocks and is often found as small mineral inclusions in more weathering-resistant silicate minerals. To better understand the distribution of apatite in soils and its exposure to soil solutions, a sequential ...

84 per cent albite and we know enough of relations in our general system (Fig. 1) to be able to say that the conditions are similar in mixtures with an excess of silica (simplified fayalite-rhyolites) and also in those with a deficiency of silica (simplified fayalite-phonolites). While we have made only a first step in the investigation of these extreme liquids it is plain from the results of t...