Oxygen Isotope Study of the Suzhou Granite

摘要

Oxygein isotope studies of the Suzhou granite have been made based on drill-hole samples. In the inner part, the δ~18O values are less variable either in the whole-rock, quartz or in feldspar. Ozygen isotopic compositions are in equilibrium between coexisting quartz and feldspar. Data points from the inner part are plotted in a small area in the δ~18O_Q-δ~18O_f dia- gram, indicating that this part has not been affected by meteoric hydrothermal fluids. But the whole-rock δ~18O values of the marginal part vary greatly. Oxygen isotopic compositions are in extreme disequilibrium between quartz and feldspar.