鲁东即墨地区八亩地组火山岩及其内部砂岩特征

Characteristics of Volcanic Rocks and Its Internal Sandstone of Bamudi formation in the Jimo Area of Qingdao City

摘要:

鲁东即墨地区广泛分布以安山岩、安山质集块角砾（熔）岩等为主的八亩地组中—基性火山岩，对应的八亩地旋回是区内火山岩的鼎盛期，包括了溢流相—爆发相—强爆发、溢流相交替—潜火山岩相侵位的全部活动过程。其内部的沉积相砂岩以肠状—团块状、夹层及脉状3种状态产出，对于了解八亩地组火山岩岩相特征，喷发序列及构造活动历史等具有一定的帮助作用。

Abstract:

Medium-basic volcanic rocks in Bamudi formation which is mainly composed of andesite and andesitic agglomerate breccia lava is widly distributed in Jimo area of eastern Shandong province. The corresponding Bamudi volcanic cycle is the strongest stage of volcanism in this area, including effusive facies-explosive facies-alternative stong explosive facies-subvolcanic facies. The sedimentary sandstone in the internal occurred as ptygmatic-massive type, interlayered type and vein type. It will help to learn lithofacies characteristics, eruption sequences and tectonic activities history.