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广东雷州半岛南部第四纪更新世晚期碱性玄武岩浆活动广泛。胡长霄曾报道过田洋火山口附近火山角砾岩中产有超基性角砾,并认为来源于上地幔。其附近碱性玄武岩流中也有类似成分的地幔岩包体。本文所研究的样品即采自碱性玄武岩流的地幔岩包体。 对地幔岩包体的固态塑性形变研究是阐明地幔对流机制的重要内容,并可为板块运动和上地幔动力学的研究提供地幔物质塑性流动的直接证据。
Alkaline basaltic magmatism was widespread in the late Pleistocene in southern Leizhou Peninsula, Guangdong Province. Hu Changxiao reported that there were superbasic breccias in the volcanic breccia near Tian Yang crater and was thought to originate from the upper mantle. There are similar mantle rock inclusions in the alkaline basalt flow near it. The sample studied in this paper is a mantle lithosphere from alkaline basalt flow. The study of solid state plastic deformation of mantle rock inclusions is an important part of clarifying mantle convection mechanism and provides direct evidence of mantle material plastic flow for the study of plate motion and upper mantle dynamics.