2) y-shaped island arc
"y"型岛弧
3) island-type geosyncline
岛弧型地槽
4) island arc basalt
岛弧型玄武岩
1.
Based on geology and geochemical researches of the metabasic volcanic rocks,two types of basalts are recognized in the tectonic belt of the northern margin of the Yunkai block,southeastern Guangxi,namely,mid-oceanic ridge basalt(MORB) and island arc basalt(IAT).
06%),轻稀土元素呈富集型,具岛弧型玄武岩特征。
5) island-arc type granite
岛弧型花岗岩
6) comagmatic evolutionary series
岛弧型深成岩
补充资料:岛弧
岛弧 island arc 呈弧形排列的群岛。弧形凸面朝向海洋,岛弧外侧常有深的海沟,是分割大洋盆地和边缘盆地的重要构造地貌单元。岛弧属构造活动地区,有强烈的地震和火山活动,如太平洋上的千岛群岛、阿留申群岛等。板块学说认为,岛弧是大洋板块向大陆板块俯冲时,大陆板块受挤上拱,隆起而成。 |
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