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早古生代秦、祁、昆古洋盆及两侧陆缘板块构造格局和演化
作者单位:陕西省地矿局第四地质队
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。

关 键 词:秦、祁、昆古洋盆  柴达木─南秦岭分离微陆块  “三叉”裂谷系  沟、弧、盆体系

PLATE TECTONIC FRAMEWORK AND EVOLUTION OF THE QINLING-QILIAN-KUNLUN PALEO-OCEAN AND ITS ADJACENT CONTINENTAL MARGINS DURING THE EARLY PALEOZOIC
Authors:Yang Zongrang
Abstract: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 zoneZhang 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.
Keywords:Qinling-Qilian-Kunlun Paleo-ocean  Qaidam-South Qinling separating micro-massif  "Three branch" rift systems  trench-arc-basin systems  
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