The main lithologies consist of volcanics (andesitic breccias or agglomerates, andesitic tuffs) reworked by Tiguida and Koulountou garnet granitoids. Magmatism is marked by MORBs tholeiites associated ...

An igneous rock has come to be regarded, more constantly than before, not merely as a mineral-aggregate, but as-the product of consolidation of a molten rock-magma; and consideration has been ...