富钾火山岩是一类兼具壳幔双重地球化学特征的特殊岩石组合，它们不可能由亏损或原始地幔所派生，成岩过程中必须有地壳物质的参与，将地壳物质引入富钾火山岩成岩过程的主要动力机制即是深俯冲作用。洋壳和陆壳均可以通过俯冲进入地幔，俯冲地壳物质析出流体对地幔岩石的交代作用是导致富钾火山岩具特殊地球化学特征的主要原因。根据对大别一苏鲁造山带南北两侧晚中生代富钾火山岩的实例研究，表明该区火山岩的形成均受到了俯冲洋壳析出流体的交代作用，但造山带北侧富钾火山岩的形成还叠加了俯冲的扬子陆壳析出流体的交代作用，是多次富集事件综合作用的结果。文中还对富钾火山岩成因研究中值得进一步深入探索的问题进行了讨论。

Late Cretaceous (90-100Ma) A-type granites are widespread in the coastal area of the Zhejiang and Fujian Provinces, SE China. According to mineralogical and geochemical characteristics, the A-type granites in this belt can be further divided into aluminous and peralkaline subgroups. The aluminous subgroup often contains aluminous-rich minerals (e.g. spessartine and Mn-rich muscovite), while the peralkaline subgroup usually contains riebeckite, arfvedsonite and aegirine. Geochemically, the aluminous A-type granites show lower Nb, Zr, Ga, Y and REE abundances, and lower FeO*/MgO and Ga/Al than the peralkaline subgroup. When they occur in the same area, the two subgroups of A-type granites display quite similar initial Nd isotopic compositions, which are indicative of mixing of ancient basement crustal rocks with variable amounts of mantle materials. Integrated geological and geochemical investigations indicate that both the aluminous and the peralkaline magmas are highly evolved and reflect the residual liquids left after high degrees of fractional crystallisation in a deep magma chamber. The present authors suggest that the mineralogical and geochemical differences between the aluminous and peralkaline subgroups are likely to have been generated via different differentiation paths controlled by varying fluorine contents of the parent magmas.