摘要
桂东南云开地区的基底主要由前寒武纪变质表壳岩与变形变质花岗岩组成 ,晚古生代、中生代盖层相当薄。该地块形成于晚前寒武纪 ,它在古生代向北运移并同时发生左旋旋转。这一事件奠定了该区的构造格局。在中二叠世末的东吴运动期间 ,该地块作为一个变质地体最终与钦州沉积地体拼合。文章重新对云开地区的大地构造特征进行了认识 。
The base of Yunkai block in Southeast Guangxi is mainly composed of Pre-Cambrian metamorphic crust-rock and deformed-metamorphic granite. Its late-Paleaozoic and Mesozoic cover is very thin. After it formed in late Pre-Cambrian, Yunkai block had been moving northwards in Paleaozoic while rotating counterclockwise. This event got the structural pattern of this block. And as a metamorphic terrane, the Yunkai block amalgamated to Qingzhou sedimental terrane in the period of Dongwu movement in the end of middle Permian. Here we recognize the tectonic feature of Yunkai area and conclude that there are Jingning (maybe Pre-Jingning) geological bodies and geological event in the metamorphic base of Yunkai area.
出处
《广西地质》
2002年第2期1-6,共6页
Guangxi Geology
