桐柏—大别山碰撞造山带的大地构造演化

桐柏—大别山碰撞造山带是华北板块南部大陆边缘和扬子板块北部大陆边缘长期演化和碰撞的结果。造山带主要由北淮阳加里东构造带、桐柏—大别山古老断块隆起带和随广加里东构造带组成。根据现今查明的三条蛇绿混杂岩带和不同时代岩系的原岩建造及区域构造特征,重建了其碰撞期前的古地理-古构造格局。在加里东末期,华北板块与扬子板块发生碰撞,形成了桐柏—大别山造山带。在碰撞期及碰撞期后曾发生了大规模的滑脱-推覆构造。

THE GEOLOGICAL EVOLUTION OF THE COLLISION TYPE OROGENIC BELT IN THE TONGBAI -DABIESHAN MOUNTAIN

The Tongbai - Dabieshan collision type erogenic belt can be interpreted as the consequence of a long time evolution and the collision, both of which occured between the southern continental margin of the North China plate and north continental margin of the Yangtze plate. The orogenic bell consists mainly of the Beihuaiyang Caledonian tectonic belt, the Tongbai -Dabieshan old fault block uplift and the suiguang Caledonian tectonic belt. Based on the recent investigations about the ophiolitic melange zones, the formations of primary rocks for different ages and characteristics of regional tectonics. the writers have reconstructed the ancient geographic and structural patterns before the collision. It is suggested that the North China plate had collided with the Yangtze plate and eventuallyre-sulted in the Tongbai -Dabieshan Mountain orogenic belt by the end of caledonnian. The large thrust- decollcmcnt structures occured during as well as after the collision period.