中国早古生代三大古海洋及其对盆地的控制

以中国诸陆块和古中国洋为中心的晚元古代—早古生代古板块体制可概括为"三洋四陆",即3个相互连通的洋盆分割了四大陆块(群):西伯利亚陆块(群)、古中亚洋、华北陆块群、古中国洋、华南陆块群、原特提斯、印度冈瓦纳。3个洋盆的扩张、消减,陆块碰撞造山或增生造山及其转化着的地球动力在各陆块内的响应导致这一时期中国早古生代盆地的形成和演化。由此形成了台内和陆缘不同的原型盆地演化序列。在大陆裂解期,台内主要出现裂谷、坳拉槽原型盆地,然后转为台内坳陷。早古生代陆块规模小,陆缘盆地风格突出。在造山带形成与演化中,陆缘坳陷对油气的赋存意义最大。 

THREE PALEO-OCEANS IN THE EARLY PALEOZOIC AND THEIR CONTROL TO BASINS IN CHINA

The Late Proterozoic-Early Paleozoic ancient plate system centered by Chinese plates and the Ancient China Ocean can be described as 3 oceans and 4 lands.There are 4 big plates seperated by 3 connected oceans: the Siberia Plate(group),the Ancient Middle Asia Ocean and North China Plate group,the Ancient China Ocean and the South China Plate group,the Palaeotethys Ocean and Indian Gondwana.Formation and evolution of the Early Paleozoic basins in China during this era is influenced by ocean expansion and consumption,plate collision or construction orogenic belt and changing earth dynamics,resulting in different prototype basin evolutions.During continent parting period,rift,aulacogen prototype basin and later inner platform depression are formed.The Early Paleozoic plate is small,with typical characteristics of epicontinental basin.Epicontinental depression is important for petroleum reservation during the formation and evolution of orogenic belt.