平潭和漳州深成杂岩中斜长石捕虏晶与岩浆混合作用

Plagioclase xenocryst and magma mingling in Pingtan and Zhangzhou Complexes.

在闽东南平潭和漳州火成杂岩中，广泛发育岩浆混合现象，表现为花岗质岩石中存在辉长－闪长质同深成岩墙和淬冷岩石包体。花岗质和闪长质岩石中普遍存在Ａｎ＞７０％的斜长石捕虏晶。这种成分的斜长石是辉长岩特有的，而不是任一种花岗岩的斑晶。在斜长石捕虏晶四周，都有与花岗岩中的斜长石成分相当的斜长石加生膜。斜长石捕虏晶可分为自形的、熔融状、筛孔状和碎片状等四类。

The magma mingling phenomenon is widely developed in Pingtan and Zhangzhou igneous complexes of SE Fujian. It appears as the existence of gabbro diorite synplutonic dykes and quenched enclaves in the granitic rocks. It is found that there are plagioclase xenocrysts whose An contents are more than 70%. This kind of plagioclase is unique for the gabbroic rocks, not phenocrysts for any kind of granitic rock. All the plagioclase xenocrysts have overgrown plagioclase rim whose compositions correspond to those of granitic rocks. The plagioclase xenocrysts were divided into four types. Their dynamic environments corresponding to these four types, respectively, are discussed.