滇西南古特提斯石炭纪海山碳酸盐台地的层序地层学研究

应用露头层序地层学原理和方法，首次对滇西古特提斯（昌宁－孟连带）中海山碳酸盐台地的石炭系进行了研究。识别出６个三级层序，其中早石炭世晚期１个、威宁期３个、鱼塘寨组３个，顶部一个归属二叠纪。三级层序和相应的海平面变化旋回可以和黔南对比，但副层序厚度较大（黔南副层序小于１０ｍ，鱼塘寨１０～５０ｍ），碳、氧同位素普遍偏轻以及存在麦粒蜓带厚度变薄事件，造成这种现象的主要原因是两者之间经历了同样的冰川型全球海平面变化，但具有不同的大地构造背景.

Studying on the Carboniferous Sequence Stratigraphy of the Seamount Carbonate Platform in Paleo- Tethys,Southwestern Yunnan,China

Based on the outcrop sequence- stratigraphic principle and method, the authors first studied theCarboniferous section of the seamount carbonate platform in Paleo- Tethys(the Changning- Menglianbelt), Southwestern Yunnan, China.6 third- order sequences were examined in detail with particular at-tention to the key surface of the parasequence.There are l sequence in Early Namurian, 3 sequences bothin Late Namurian- Westphalian(Weining) and Stephanian- Sakmarian(Yutangzhai F., the upper mostsequence belongs to Permian).Third- order sequences and eustatic transgressive- regressive cycles atthe Yutangzhai (in Southwestern Yunnan) can be correlated with ones in Southern Guizhou excentparasequences.Carbon and oxygen isotopes at the Yutangzhai were lighter than those in SouthernGuizhou, Probably, the same eustasy and different tectonic background were the main causes of theabove facts during the Late Carboniferous.