Island arc character and late Precambrian age of volcanics at Wadi Shwas, Hijaz, Saudi Arabia: geochemical and Sr and Nd isotopic evidence

Details Island arc character and late Precambrian age of volcanics at Wadi Shwas, Hijaz, Saudi Arabia: geochemical and Sr and Nd isotopic evidence Island arc character and late Precambrian age of volcanics at Wadi Shwas, Hijaz, Saudi Arabia: geochemical and Sr and Nd isotopic evidence

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..54..409b&link_type=abstract

Earth and Planetary Science Letters, Volume 54, Issue 3, p. 409-422.

Computer Science

25

Scientific paper

A summary description of two volcanic sequences named the Surgah and the Shwas Formation, situated in the Wadi Shwas area at long. 42°0', lat. 20°0' in the Arabian Shield, is given. Major and trace element concentrations including REE abundances are presented, as well as Sr and some Nd isotope results. One sequence (the Surgah Formation) shows a tholeiitic differentiation trend from basaltic to rhyolitic rocks, whereas the Shwas Formation has calc-alkaline affinities. Both sequences have low concentrations of incompatible elements, notably Rb, Nb, Zr and Ti. The coexistence of a tholeiitic and a calc-alkaline suite, along with these low concentrations, is strongly reminiscent of some present-day island arc environments. An Rb-Sr errorchron age of 721 +/- 55 Ma was obtained on the Surgah Formation, with high initial 87Sr/86Sr ratios around 0.705. The rare earth abundances are overall very low and the patterns show a relative depletion of the light REE in the least evolved rocks, indicating a relatively light-REE-depleted mantle source. A time-integrated light-REE-depleted source is also indicated by the fairly radiogenic 143Nd/144Nd ratios (ɛNd values around 8). The Nd ``model age'' of source depletion (TCHURNd) is around 2.2 Ga.
Present address: Department of Geology, University of Zimbabwe, P.O. Box M.P. 167, Salisbury, Zimbabwe.

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