Late Mesozoic interaction between crust and mantle in coastal area of Zhejiang-Fujian

This paper summarizes the lithogeochemical features of composite lavas, dik es and plutons composed of early Cretaceous associated basic-acidic igneous rocks from the coastal area of Zhejiang-Fujian. On the basis of the studie s on Nd, Sr, qb isotopic signatures and geochemical characteristics of larg e ion lithophile elements (LILE), light rare earth elements (LREE) and high field strong elements (HFSE) of these contemporary basic-acidic igneous ro cks, it is considered that the source enrichment caused by the subduction o f Pacific plate and contamination of crustal rocks and melts during ascendi ng process may lead to the formation of basaltic magmas with a high LILE co ncentration. These late Mesozoic composite basic-acidic igneous reeks are t he products of the interactions between crust and mantle in active continen tal margin.