摘要
在分析了近年来秦、祁、昆造山带研究中部分成果资料的基础上，认为商、丹主缝合线以南的杨子古陆北缘区早古生代由于一系列“三叉”裂谷系的发育而曾沿布尔汉布达山─略阳─山阳─线打开一次洋盆，致使南秦岭─柴达木－带从扬子陆块北缘分离出来，一度成为一独立微古陆块向北漂移；古生代有其独特的演化历史。而当时主洋盆北侧的华北古陆南缘区则发育有完整的沟、弧、盆体系．面貌很象今天的太平洋西海岸。
On the basis of the recent achievements about the Qinling-Qilian-Kunlun Orogenic Belt. It is suggested that a by-ocean had been opened by breaking up of a series of'Three branch' rift systems during early Paleozoic along BurhanBudai Mountains-Lueyang-Shanyang zone in the northern margins of the Yangtze continent which lies in the south of the Shangdan chief structure zone[Zhang Guowei et al, 1987],which made the south Qinling-Qaidam micro-continental massif break away from the northern continental margin of the Yangtze plate and begin to shift north with a special evolutionary history during the Paleozoic.While the southern continental margin of the paleo-plate that lies in the north of Qinling-Qilian-Kunlun chief oceanic plate was composed of the complete trench-arc-basin system during the Paleozoic. Its appearance seems much like the present western sea-bank of the Pacific Ocean.
关键词
陆缘
板块构造格局
演化
古洋盆
早古生代
Qinling-Qilian-Kunlun Paleo-ocean
Qaidam-South Qinling separating micro-massif
'Three branch' rift systems
trench-arc-basin systems
