摘要
四川盆地南江震旦系灯影组以一套潮坪、台地边缘浅滩环境的白云岩为主,并在灯影组下部普遍发育葡萄状构造。空间上葡萄状构造由下往上呈弱发育→密集发育→交替发育→不发育,产出明显受到孔洞、缝的分布和形态控制。结合该区沉积、成岩演化史,认为灯影组中期存在一定时期的暴露过程和表生岩溶作用,葡萄状构造为表生大气淡水溶蚀-沉淀形成产物,是古暴露和古岩溶的重要标志。
The Sinian Dengying Formation in Nanjiang,Sichuan basin consists mainly of dolomitite of tidal flat facies and shoal facies on edge of platform.Botryoidal structure is well developed in the lower part of the Dengying Formation and controlled by pore space and fissure.This botryoidal structure results from meteoric water and karstification.
出处
《四川地质学报》
2010年第4期454-456,共3页
Acta Geologica Sichuan
基金
"四川盆地北缘灯影组深埋白云岩孔洞的形成与保存机理(41072082)"基金项目资助
关键词
灯影组
葡萄状构造
古岩溶
南江
botryoidal structure
Dengying Formation
paleokarst
Nanjiang
