TECTONIC NATURE AND TECTONIC EVOLUTION OF THE "XUEFENG OLDLAND"IN THE CALEDONIAN STAGE
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摘要: “雪峰古陆”的构造问题是华南区域构造研究中的一个热点。震旦纪至早古生代时期为扬子古陆的东南被动大陆边缘的一部分，发育了以斜坡相为主体的沉积组合；加里东造山作用时期，这里成为扬子古陆的边缘褶断山系，但仍为扬子地块的一部分而非习称的华南加里东褶皱带；它是由于华南加里东武夷─云开弧后盆地关闭，扬子地块与华夏地块拼接形成的陆孤碰撞造山带的一个组成部分。其主要构造样式为前陆地带的准原地型边冲叠瓦推覆构造。Abstract: The tectonics problem of the "Xuefeng oldland" is a focus in the regional tectonic study of South China.In the Sinian to Early Paleozoic,the oldland was a part of the southeastern passive continental margin of the Yangtze oldland,where the sediment association consisting mainly of slope factes was deposited. In the Caledonian,it became a marginal fold-fault mountain system of the Yangtze oldland but still remained as a part of the Yangtze block rather than the conventionally called South China Caledonian fold belt. This oldland was formed as a result of closure of the Caledonian Wuyi-Yunkai backarc basin of South China,assembling of the Yangtze block and the Cathaysian block and continent-arc collision orogeny and was a constituent part of the South China Caledonian continent-arc collision orogenic belt. Its main tectonic style is parautochthonous thrust-imbrication nappe structure of the foreland belt.
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