John S. Stacey, Carl E. Hedge; Geochronologic and isotopic evidence for early Proterozoic crust in the eastern Arabian Shield. Geology ; 12 (5): 310–313. doi: https://doi.org/10.1130/0091-7613(1984)12<310:GAIEFE>2.0.CO;2
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We report zircon U-Pb, feldspar common Pb, whole-rock Sm-Nd, and Rb-Sr data from sample Z-103, a fine-grained granodiorite from the Jabal Khida region of the Saudi Arabian Shield (lat 21°19′N; long 44°50′W). The measurements yield conclusive evidence for continental crust of early Proterozoic age (∼1,630 Ma) at that locality. Furthermore, lead-isotope data indicate an even earlier, perhaps Archean, crustal history for the source of the lower Proterozoic rocks.