南华夏造山带构造演化的新证据

华南的大地构造有两种解释,一种可称为加里东造山模式,另一种可称为华南阿尔卑斯模式。前者认为华南是一个早古生代造山带,其后便成为准地台。中生代时受到活化导致盖层与基底的褶皱、断裂、岩浆作用和成矿作用。但这个模式不能解释许多地质事实。 本文继许靖华等(1987)的模式之后,给出了一些新证据,其中包括皖赣蛇绿混杂岩、蓝田、西山和乐平构造窗以及庐山飞来峰。这些证据为华南的三叠纪造山作用和构造演化模式提供了强有力的支持。

NEW EVIDENCES ABOUT THE EVOLUTION OF THE SOUTH CATHAY OROGENIC BELT

There are two tectonic interpretations of South China tectonics, of which one can be called "Caledonian model" and another called "South China Alps model". The former proposed a model that south China was an Early Paleozoic orogenic belt followed by the orogeny which made it a paraplatform. During Mesozoic, the platform underwent reactivation to lead to folding and faulting of the cover and basement, magmatism and metallogenesis. There are many geological facts that can not be explained by this model.In this paper, following the model of Hsu et al. (1987), some new evidences are given, including the Wangan ophiolite melange, Lantian Window, West Hill Window, Leping Window and Lushan Klippen. These evidences provide forceful support for tectonic interpretation of the Triassic orogeny and the tectonic evolution model in South China.