华南(东)晋宁—加里东海盆地形成、演化及封闭

THE FORMATION, EVOLUTION AND CLOSURE OF JINNING-CALEDONIAN SEABASIN IN THE EAST OF HUANAN

华南(东)存在二块早前寒武纪结晶基底,并在中元古代末发生碰撞对接,晚元古代早期沿着碰撞对接带再度拉开,形成了晋宁—加里东海盆地,其海盆地形成,演化经历了六个时期:(1)青白口纪的强烈扩张期;(2)晋宁运动海盆地局部封闭;(3)Z—∈的双大陆边缘裂陷槽发展期;(4)郁南运动,海盆地再次局部封闭;(5)O—S的残留海发展时期;(6)广西运动,海盆地全部封闭。

There exist in the east of Huanan two blocks of early Precambrian crystalline basement and impingement joints happened in the end of middle Proterozoic Era, stretched again in the early late Proterozoic Era along the impingement joints zone, thus formed the Jinning-Caledonian seabasin, the formation and evolution of seabasin experienced six stages: 1) the strong extension period of Qingbeikou; 2) Partial closure of seabasin during Jinning Movenent; 3) The developement Period of Z—∈_2 bieontinental marginal fissure flute; 4) Yunan Movement, another partial closure of seabasin; 5) The deveiopement period of O—S residual seas; 6) Guangxi Movement, the total closure of seabasin.