Abstract
The Um Samuiki district (1540 km2) is covered successively by Precambrian geosynclinal metasediments and Shadli metavolcanic flows that were intruded by serpentinites and meta-gabbros, then by biotite and hornblende syn-tectonic granitoids followed by the late- to post-tectonic muscovite granites. The metasediments (2.5 km thick) are represented mainly by plagioclase amphibolites with minor chlorite-actinolite schists and dolomite marbles. The Shadli metavolcanics, stratigraphically divided into four mappable units exceeding 10 km in thickness, are made up of pillow andesites (42.5%), rhyolites (32.5%), basalts (6.5%) and andesitic-rhyolitic volcanoclastics (mainly pyroclastics).
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