锦屏隆里至黎平古帮地区青白口纪末南华纪早期沉积作用特征

The Early Sedimentation Characteristics at the End of Qingbaikou System and the Early of Nanhua System in the Area from Longli of Jinping County to Gubang of Liping County

锦屏隆里至黎平古帮地区,青白口纪末南华纪早期沉积作用特征可概括为碎屑流-浊流-悬浮沉积、震积岩和冰碛岩(包括水下泥石流)三个系列,文中讨论了隆里组中下部发育的细砾岩波痕,指出白土地砂体为南华纪初因成冰期来临海平面下降而形成的特殊性地区沉积建造,即长安成冰期开始时低水位氧化环境下的斜坡扇,该砂体常发育与金矿化有关的硅化、硫化物矿化及其它蚀变特征,对寻找蚀变岩型矿产资源具有较大意义。

In the area from Longli of Jinping county to Gubang of Liping county,the early sedimentation characteristics at the end of Qingbaikou system and the early of Nanhua system can be summarized as three series including waste stream-turbidity current-suspended sedimentation,seismites and gracial rock（including underwater mud-rock flow）.The paper discussed the wee conglomerate wavemark developed in the lower part of Longli group,and analyzed the cause.It pointed out that the white sand body was a set of sedimentary formation formed because of the drops in sea level in the coming of the ice age in the early Nanhua System.It was a slope fan in the low water oxidation environment at the beginning of the ice age of ChangAnCheng.