Abstract: This paper deals with the tectonic features of three terranes,namely Suizhou-Guangji,northern Huaiyang,and Tongbai-Dabie terranes. The first consists of subducted melange,which underwent high P-low T metamorphism. The second terrane consists of ophiolitic melange in its central and Western parts and tectonic melange in its eastern part which underwent high P-Low T(11℃/km) metamorphism. The third terrane is continental crust block in a paleao-ocean,with an evolutation into a volcanic arc. During the Caledonian and Hercynian movements these three terranes were involved in the mountain-building events. Although they were deeply eroded. it is recognized that the Suizhou-Guangji and northern Huaiyang terranes have overthrusted the Tongbai-Dabie terrane northward and southward respectively.

Key words: Tongbai-Dabie mountains, Terrane, Collision, Ductile shear zone

摘要： 本文讨论了桐柏山-大别山的地质构造特征。对该区三个地体进行了研究,指出:南部随州-广济高压浅变质地体具有俯冲杂岩性质;北部北淮阳高压浅变质地体中、西段具有俯冲杂岩性质,东段具有构造混杂岩特征;中部桐柏-大别山地体早期是洋盆中的大陆地壳残块,后期演化成岛弧。在加里东或海西-印支时期三地体先后碰撞造山。随州-广济地体和北淮阳地体分别向北、向南逆掩或推覆到桐柏-大别地体之上。

关键词: 桐柏山-大别山, 地体, 碰撞, 韧性剪切带