罗圈期—东坡期地层格架研究及时代讨论

罗圈组堆积冰碛在沉积海盆地中的搬运方式主要为浊流，由浊流沉积物的层状构造特征（块状、似层状、层状、板状）和组合方式可反映其移动距离的远近和相对海平面变化情况。在陆源物质供应间歇阶段，沉积海盆地中生成碳酸盐岩沉积，构成连接含小壳化石的深海沉积与不含化石的浅海沉积的物理地层纽带。罗圈组为一穿时地层单位，时代为震旦纪—早寒武世。罗圈组与东坡组是因陆源物质搬运距离远近、沉积环境改变所形成的同期异相沉积

RESEARCHING ON STRATIGRAPHIC FRAMEWORK AND DISCUSSION ON THE CHRONOLITHOLOGY OF LUOQUAN AGE TO DONGPO AGE

Diamictites of the Luoquan Formation had been deposited in the sea basin, which were transported by turbidy current. The stratified(or massive, para stratified, platy) structure character and its composit style of the turbitity current sediments may reflect the transportion distance away from distal or proximal sources and the relative sea level change. The carbonatites in the sea basin had been deposited when the terrigenous material had been in the intermiltent time. The carbonatites bed is a physial stratum which had connected a deep sea deposit containing small shelly fossils with shallow sea deposit without fossils. Luoquan Formation is a diachronous unit from Sinian to Lower Cambrian.Luoquan and Dongpo formations were a heteropic deposits in a synchronous time as a result of the terrigenous deposition through being transported on the far or near distance which had been deposited in different kinds of environments.