Abstract
The volcanologic and petrochemical characters and paleogeographical setting of the Upper Proterozoic volcanic suites in the northern Arabian Shield reflect various stages of a mobile belt evolution. The oldest volcanic suite represents the marine outpourings of basalt (probably tholeiitic) of an ophiolitic complex. This is followed (740 to 640 Ma) by an intermediate to acidic (chiefly quartz-keratophyre) volcanism associated with shallow-water sediments (Hulayfah Group). The lava exhibits calc-alkalic and tholeiitic compositions which are similar to island-arc and active continental-margin type volcanism.
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