论大别山南缘襄樊—广济断裂的两次向南逆冲推覆

被引：20

作者：

杨坤光 ^{[1
,2
]}

程万强 ^{[2
]}

朱清波 ^{[2
]}

李学刚 ^{[2
]}

机构：

[1] 中国地质大学(武汉)构造与油气资源教育部重点实验室

[2] 中国地质大学(武汉)地球科学学院

来源：

地质论评 | 2011年 / 57卷 / 04期

关键词：

襄樊—广济断裂; 逆冲推覆; 挤出构造; 大别山南缘;

D O I：

10.16509/j.georeview.2011.04.008

中图分类号：

P542.3 [];

学科分类号：

070904 ;

摘要：

位于大别山南缘的襄樊—广济断裂是扬子板块与大别造山带的边界断裂。大体以黄陂为界,断裂东段与西段在几何结构上有所差异:东段在地表浅层表现出向北反向逆冲,深部则以向南大规模逆掩为特征;西段浅层与深部一致,表现为典型的大型低角度叠瓦状逆冲推覆。野外地质数据、40Ar/39Ar定年、锆石U-Pb LA-ICP-MS定年和沉积学资料表明,自中三叠世以来,该断裂带发生了两次明显的向南逆冲:第一次逆冲发生在中三叠世(约240～231M a),与北界的浒湾拆离断层同时启动,响应于大别山超高压从地幔深度折返到下地壳的挤出过程;第二次逆冲发生在中—晚侏罗世(约160～140M a),即发生在大别山白垩纪热隆伸展之前,因为伴随热隆伸展侵位的巨量花岗岩体并未卷入逆冲变形。第一次逆冲推覆以超高压折返伴随的中—高角度逆冲为特点,发生在大别造山带内部。第二次逆冲发生在造山带东部南缘,以低角度巨型逆冲推覆为特点,使大别造山带深变质岩大规模覆盖在扬子板块北缘的沉积岩之上,最大覆盖宽度大于60 km。东段由于受江南古陆的准同时向北逆冲改造,在浅层形成向北逆冲的几何学结构。

引用

页码：480 / 494

页数：15

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