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秭归县杨家岭第四纪推覆构造的发现及其意义

DISCOVERY OF YANGJIALING QUATERNARY NAPPE STRUCTURE AND ITS SIGNIFICANCE
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摘要 杨家岭第四纪推覆构造的主要标志是寒武系角砾状灰岩及白云岩逆冲于志留系砂页岩和全新世崩坡积层之上。推覆构造由推覆体、基座和滑脱面组成。滑脱面的产状为N80~90°E、10~60°/S,呈波状起伏。推覆体内的派生构造指示推覆构造由南向北逆冲。成生联系上,杨家岭推覆构造属南面天阳坪逆掩大断裂带(推覆构造带)的一部分。杨家岭推覆构造经历了一个从第三纪至今的漫长发展历史,其最近的一次强烈活动,据^(14)C测定数据,距今2400年左右。它的出现和活动对三峡工程稳定性将产生严重的影响。 The Yangjialing Quaternary nappe structure is situated at the southwestern corner of Huangling anticline, at the southern end of Jiuwanxi fault zone, 19km west from Sandouping. The nappe structure is marked by obduction of the Cambrian brecciated limestone and dolomite over the Silurian sandy shale and Holocene slumped slope bed.The whole structure involves the nappe, the base and the sliding plane. The undulating sliding plane strikes N80-90°E and dips 10-60° to the south. The derivative structures within the nappe show a S-N obduction of the nappe. In genetic relation, the Yangjialing nappe is part of the Tianyangping overthrust fault belt (nappe structure belt). It has undergone a long duration of development since the Tertiary. The last strong activity of the nappe structure took place about 2400yrs B. P., according to 14C dating. The occurrence and activity of such a structure will surely affect the stability of the Yangtze Gorges Project.
作者 唐贵智 陶明
出处 《中国岩溶》 CAS CSCD 北大核心 1990年第4期330-341,共12页 Carsologica Sinica
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  • 1刘锁旺,丁忠孝,张俊山.1856年湖北咸丰县大路坝地震考察[J]地壳形变与地震,1981(02).
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