捕虏体(xenolith),是岩浆在侵入作用过程中所捕获的围岩碎块。其形状和大小不一;由于在围岩崩落时发生移动,其构造方向与围岩整体的构造方向常不一致;围岩崩落于岩浆中,大部分都被岩浆熔化及交代,因此,只有少数在岩体边缘还可残存,多分布于火成岩的边缘部分。 根据岩性不同可分为长英质岩类的捕虏体和超镁铁质岩捕虏体。 长英质岩捕虏体分为浅源捕虏体(epixenolith)和深源捕虏体(hypoxenolith)两大亚类。 超镁铁质岩捕虏体(ultramafic xenolith),即地幔捕虏体。
The Rokko Mountains located in the north of Kobe city,Southwest Japan,mainly consist of the late Cretaceous granitic rocks. The Dobashi quartz diorite occurs as an xenolith in the Rokko granite.
六甲山花岗岩类位于日本西南部神户市北部,形成于晚白垩世,其中的土桥石英闪长岩是作为捕虏体出现于六甲花岗岩体中。
参考来源 - 日本神户六甲山石英闪长岩~(40)Ar·2,447,543篇论文数据,部分数据来源于NoteExpress
上述捕虏体均与寄主玄武岩无成因关系。
No original relation was found between the xenoliths and the host basalt.
捕虏体可见于许多层位,并局部可见到冲刷和其他侵蚀特征。
Xenoliths are found at numerous horizons, and locally there is evidence of scour and other erosional features.
紧邻郯庐断裂带分布的山东昌乐新生代玄武岩含有丰富的辉石岩捕虏体。
Abundant pyroxenite xenoliths were found from the Cenozoic Changle basalts, an area distributing near the Tanlu fault zone.
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