碳酸盐岩氧、碳同位素与古温度等的关系

The Radition of the Oxygen and Carbon Isotope in the Carbonate Rocks to the Paleotemperature etc.

湖南省湘中地区下石炭统主要由碳酸盐岩组成，其δ￣（１３）Ｃ在－３．９～＋５．８‰之间，Ｚ值大于１２０，反映了正常海相环境。用校正过的δ￣（１８）Ｏ计算出的石灰岩形成时的古温度在１５°～２５°之间，说明早石炭世区内为热带和亚热带气候。最后，文中还对δ￣（１８）Ｏ、δ￣（１３）Ｃ和沉积旋回的关系进行了讨论及分析。

Lower Carboniferous in the central area of Hunan province mainly consists of carbonate rocks. The detailed study on the O-and C-stable isotope compositions indicatesthat the carbonate rocks of Lower Carboniferous were formed in marine environments withthe evidences of δ￣(13)C(between-3.9 and +5.8‰)and the Z values > 120.Thepaleotemperature range(14℃ to 33℃, mostly 15℃～25℃) which was calculated by meansof the revisedδ￣(18)Oshows the tropical and subtropical climates during Early Carboniferous.Finally,the relation betweenδ￣(18)O、δ￣(13)O and cyclic sedimentation has been discussed andanalyzed.