闽东南长乐-南澳断裂带“片麻状”浆混杂岩的厘定及其地质意义

    Identification and significance of "gneissic" magma-mixed complex in the Changle-Nan'ao fault zone, southeastern Fujian, China

    • 摘要: 近年来的区域地质调查在闽东南长乐-南澳断裂带中,多处新发现白垩纪(辉长)闪长质和二长花岗质岩浆经机械的、化学的混合形成各种浆混岩类,与两混合端元岩石共同构成浆混杂岩,成岩后还受到应力作用。它们因特殊的结构构造而长期被归入混合花岗岩或片麻状花岗岩类。描述了泉州市肖厝、福清市高山等地浆混杂岩的野外地质特征,并与莆田市和福清市的典型变质变形花岗岩类进行了对比,指出这3类岩石之间有明显的区别,浆混杂岩可能形成于主变质变形期之前早白垩世早期的伸展环境中。

       

      Abstract: Various magma-mixed plutonic rocks formed by physical and chemical mixings in Cretaceous dioritic and monzogranitic magmas have been discerned in the Changle-Nan'ao Fault Zone of southeastern Fujian Province during recent regional geological surveys. Magma-mixed rocks and their two end-member rocks comprise magma-mixed complex, and underwent stress affect after emplacement. They were misunderstand as migmatites or gneissic granites formed by metamorphism and deformation for a long period due to their specific texture. This paper describes field geologic appearances of magma-mixed complex exposed in Xiaocuo of Quanzhou and Gaoshan of Fuqing, their petrological diversities with typical both deformed granite in Putian and granitic gneiss in Fuqing, and infers that magma-mixed plutonic rocks were emplaced in an extensional setting during early period of Early Cretaceous, earlier than main metamorphism-deformation phase.

       

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