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Characteristics of Late Hercynian magmatic activity and its formation mechanism in Nanpanjiang depression and adjacent areas
Author(s): 
Pages: 72-78
Year: Issue:  2
Journal: URANIUM GEOLOGY

Keyword:  岩浆活动构造背景海西晚期南盘江坳陷及邻区;
Abstract: 南盘江坳陷及邻区海西晚期岩浆岩分布显示有从中、西部大规模玄武岩喷发→中东部中酸性岩浆活动→东南部花岗岩侵入的演化规律.其中,在十万大山盆地以西地区的偏基性岩浆活动受北东和北西向深断裂控制明显,尤其以此两组断裂交汇处的岩浆活动强烈,盆地构造背景属大陆伸展裂谷环境;在十万大山盆地以东地区为偏酸性岩浆活动,主要受东吴运动形成的钦防造山带的控制,属大陆边缘造山带或岛弧造山带环境.岩浆活动的模式为:早二叠世末期,在研究区中、西部地壳强烈拉张应力作用下,扬子板块向南东仰冲于云开地体之上,钦防海槽关闭,沿北东向的博白-岑溪断裂带发生陆-陆碰撞,其动力来源可能与邻区的"峨嵋山玄武岩省"相关.海西晚期盆地的沉积特征也反映出岩浆活动的规律.
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