Oxygen-isotope and other geochemical attributes of some Archaean granitoids from southwestern Australia

Yilgarn granitoids yield the following delta O values (per mille): banded gneisses 7.91 + or - 0.52, synkinematic gneisses 7.89 + or - 0.87, all gneisses 7.89 + or - 0.83, all granites 7.89 + or - 0.54 and all granulites 6.95. Many of the granitoids had protoliths of acid igneous rocks (tuffs/lavas and granitoid plutons).J.A.H.