莲沱组,是以组为岩石地层单位的地层结构。刘鸿允、沙庆安于1963年命名。是一套含凝灰质成分较多的粗碎屑岩组。底部不整合于黄陵花岗岩或崆岭群之上,顶部与上覆南沱组底部的黄绿色块状冰碛泥砂质砾岩假整合接触。该组分布于川、鄂地区。
热事件沉积产物见于下震旦统莲沱组,夹于河流相沉积的砂岩及粉砂岩中。
Hot event deposits occurred in Liantuo Formation of Lower Sinian, interbedded in fluvial facies sandstones and siltstones.
宜昌三斗坪地区南华系CIA研究表明该区南华系下统莲沱组下部的CIA值在50~65之间(干燥寒冷),上部为65~75之间(温暖潮湿)和顶部为55~60之间(干燥寒冷);
Our results show that the value of CIA is at 50~65 in the lower part, 65~75 in the upper part and 55~60 in the top part of the Liantuo Formation, Lower series of Nanhua.
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