摘要
同位素地质学、岩石学、成矿学、地球物理学等新成果表明，华南震旦纪以来的构造层之下普遍存在元古代一太古代变质基底。四堡期（Ｐｔ＋２）雪峰期（Ｐｔ３）发生两次陆内裂陷，形成断续的岩石圈断裂，局部性陆间沟一弧和小洋盆，把华南古大陆分成扬子块体和华夏块体。两次陆缘裂陷分别形成广西期（Ｚ一Ｓ）华南大陆边缘弧后扩张盆地和新生代琉球弧一菲律宾弧后东海一南海扩张盆地。东海一南海的前寒武纪陆块是华南一东南亚大陆裂解碎块，它不存在另一前寒武纪陆块，不存在印支一南海准地台。讨论了许靖华关于华南三叠纪碰撞造山带的理论，结论如下：（１）华南造山带命题正确，但论据不真实，对于该造山带的性质、特点和形成机制的理解不确切。（２）元古代构造混杂岩一蛇绿混杂岩不能做为三叠纪造山带的证据。（３）不存在扬子和华南二块体的三叠纪碰撞，因为没有发生过“印支造山运动”，也没有出现过古生代湘赣浙大洋。（４）华南是双向“干造山带”，泥盆纪至中王叠世地台盖层和上覆中新生代盆地层在无海侵的大地构造环境下，经历了多幕造山运动，形成具有双向大地构造线的造山带。在南西侧的特提斯构造域以北西一北西西向占优势；在南东侧的北西太平洋构造域以北东向为主。（５）地台盖层和盆地?
It can be explained that there is an universal porterozoic-Archaeozoic metamorphic basement under thepost-Sinian structural layers in South China , owing to new study results on isotope seology , petrology , metallogeny ,geophysics , etc Two times of intracontinental split-depression in Sibao Age (early-middie Proterozoic) and XuefengAge (early-late Proterozoic) resulted in the formatfon of discontinuous lithocpheric fractures and small intracontinentaloceans and trench arca in limited areas, separating the ancient Souh China into continent into the Yangtze and Huaxia( Cathaysia) blocks. Two times of continent- marginal beckarc split-depression occurred forming the Huanan beck-arc spreading basin in Guangxi Age (Sinian-Silurian) and the Cenozoic East China Sea South China Sea spreadingbesin at the back of Phiippine-Ryukyu arc. The Precambrian continental blocks in the East China Sea-South ChinaSea are splits of the South China-Southeast Asia continent. There is no other Precambrian continental block and In-dosinian South China Sea poraplatform in the Eest China Sea-South China Sea region.Kenneth J. Hsu's idea about the Triassic collisional orogene (Huananides) in South China is discussed. The conclu-sion is as follows: ( l ) Hsu's proposition , the Huanan orogene (Huananides) . is right, but the grounds of argument arenot true and Hsu's recognition about the nature, characteristics and formation meclianism of the orogene is not exacti( 2 ) the Proterozoic tectonic melanges and ophiolitic melanges cannot be regarded as the evidence of the Triassic collistonalorogene ; ( 3) there is no Trlassic collsaion between the Yangtze and Huanan blocks in South China because .no 'lndorinianOrogeny'' occurred and no Paleozoic Hunan - Jiangxi Zhejiang Ocean appeared ; ( 4 ) The South China region is a 'dryorogene''. The cover of the Devonian - middle Triassic platfotm and its overlying Meso Cenozoic basin strata underwentpolypliase orogenies in the continent without ingression , forrning the orogene with bidirectional geotectonic lines dominantin NW NWW direction in the Meso Cenozoic Tethys tectonic domain and NE direction in the northwestern Pacifictectonicdomain ; (5) The synchronous porasynchronous folds in the platlorm cover and the basin strata were inducedby polyphase orogenies since the Eocene in the Tethys tectonic domain and late Jurassic in the northwestern Pacific tectonic donlain .
出处
《安徽地质》
1994年第Z1期27-38,共12页
Geology of Anhui
基金
广西壮族自治区教育委员会科研基金
关键词
大陆裂陷
印支造山运动
地台盖层褶皱
南华造山带
continental split-depression , Huananides . Indosinian orogenic movement . fold in platlorrn cover , Nanhua orogene, South China
