摘要
研究结果表明 ,贵州南部台地相区二叠纪罗甸末期—冷坞期的海平面经历了连续 7次三级旋回升 -降的变化过程 ,这一过程可分为以早期上升较慢为特点 (包括第 1～ 3次升降旋回 )和以早期上升较快为特点 (包括第 4～ 7次升降旋回 )的两个不同阶段 ,其中以海平面第 1次升降旋回的早期上升最慢 ,第 4次的最快 ;海平面变化期间的海面始终都位于台地边缘坡折带之上 ,而最后一次海平面下降叠加东吴运动导致海水退出台地。
Seven 3rd-order cycles of continuous sea-level changes from the late Luodian Stage to the Lengwu Stage (Permian) in the platform area of southern Guizhou Province are recognized based on the characteristics of sequence stratigraphy in the study area. The process of regional sea-level changes could be divided into two stages,of which the first stage includes 1st～3rd cycles characterized by lower rate of early rise;and the second stage includes 4th～7th cycles characterized by higher rate of early rise. Among these cycles,early-rise rates in the first cycle and the fourth cycle were the lowest and highest,respectively. Although the sea surface in the process of sea-level changes was always high up the shelf break,the last sea-level fall accompanied by the Dongwu crustal movement at the end of Lengwu Stage caused overall regression and exposure of the area. The study results show that the evolutionary pattern of fusulinacean foraminifera (Middle Permian) in this area might be related to above mentioned sea-level changes.
出处
《高校地质学报》
CAS
CSCD
2004年第2期275-282,共8页
Geological Journal of China Universities
基金
国家自然科学基金项目 (40 0 72 0 0 8)
高等学校博士学科点专项科研基金项目 (19990 2 84 2 4 )
关键词
贵州南部
碳酸盐台地
二叠纪
海平面变化
southern Guizhou,carbonate platform,Permian,sea-level changes
