LATE PROTEROZOIC CRUSTAL HISTORY OF THE ARABIAN SHIELD, SOUTHERN NAJD PROVINCE, KINGDOM OF SAUDI ARABIA

The Arabian Shield was formed by successive accretions of newly formed crust between 1,000 and 600 Ma ago. Successively younger island arcs formed to the East as West-dipping subduction zones shifted eastward. West of Bishah, the volcanic-plutonic crust had consolidated against Africa by about 780 Ma ago when westward-directed subduction ceased at the Nabitah suture.