中国东部晚元古代—三叠纪古板块的运动学研究

本文在认真选择现有的、比较可靠的古地磁资料基础之上,综合构造变形、沉积古地理、岩浆活动与变质作用的资料,再造了中国东部各板块自晚元古代(晨旦纪)到三叠纪的古构造图。晋宁事件以后直到古生代的整个时期,华南各板块与中朝板块张裂分离,保持相当的距离并在中、低纬度地带不断迁移,形成各具特色的构造演化史。三叠世末期,临沧、保山地体拼合到扬子板块的西侧,湘桂板块可能插入南华板块;中三叠世末期南华板块与扬子板块拼合,并使它们发生普遍的褶皱;晚三叠世末期,扬子板块才与中朝板块拼合,中国东部各板块联成一体,使构造格架基本定型。

ON KINEMATICS OF LATE PROTEROZOIC-TRIASSIC PALEOPLATES IN EASTERN CHINA

Depending on the more reliable existing paleomagnetism data selected seriously, comprehending the rock deformation, sedimentary paleogeography, magmatism and metamorphism data, the Late Proterozoic-Triassic paleotectonic sketches of the plates in eastern China have been drawn. Since the Jinning event,up to the entire period of Paleozoic, the extension has existed in the China-Korea plate and the plates of South China, which maintained the considerable distance, migrated continuously in the low and intermediate latitude zone,and thus made different tectonic evolutions. Since the Triassic, they have come to amalgamate gradually. In the end of Early Triassic, the Lincang-Baoshan terrane amalgamated to the western Yangtze plate, the Xianggui plate probably inserted into the South China plate. In the late stage of Middle Triassic ,the South China plate collided with Yangtze plate and the widespread folding was developed in them. Up to the end of the Late Triassic, the Yangtze plate then collided with the China-Korea plate, the plates of eastern China amalgamated, the tectonic framework of which was fundamentally set up.