THE FEATURES OF THE MOUNT FURONG CALDERA STRUCTURE IN ZHEJIANG-MATERIAL SOURCE OF THE INTRUSIVE COMPLEX

With its distinctive geomorphological features, perfect ring faults and dikes and aeromagnetic and geochemical anomalies that spread in a ring form, the Mount Furong caldera structure displays a typical caldera model characterized by the integration of geological-geophysical-geochemical features and a relatively complete composition of lithofacies-structure. Calculation by use of the binary （crust-mantle） mixed model, the material compositions of the volcanic and intrusive rock provenances are UC 71.16 DM28.84 and UC 70.84 DM29.16. According to the process of rock formation simulated quantitatively in the light of the element partition theory, the primitive magma of the volcanic-intrusive complex in the Mount Furong area was derived by about 31% of partial melting of source rocks.