江西修水地区震旦系南沱组冰成岩研究

The glacigenous rocks from the Sinian Nantuo Formation in the Xiushui district, Jiangxi

通过对江西修水地区震旦系南沱组地层、沉积相的研究,识别出5种沉积相类型:碎屑流沉积相、滑塌沉积相、冰筏海洋沉积相、陆架砂泥互层相和陆架泥岩相,重力流沉积分布在该组下部。确定其主要为一套叠加在陆架、陆坡背景沉积之上的冰成岩系。按演化自下而上可分为:先驱冰期、间冰期、主冰期及余冰期几个阶段,与邻区能很好的对应。

The Nantuo Formation strata in the Xiushui district, Jiangxi are regarded as the glacigenous rocks intercalated with the continental shelf and slope deposits. Five types of sedimentary facies have been distinguished: debris flow deposits, slump deposits, icerafting and marine facies, mixed shelf sand and mud facies, and shelf mudstone facies. The gravity flow deposits lie in the lowermost part of the Formation. All the deposits may be assigned to the glacigenous rock series overlapped upon a sequence of continental shelf and slope deposits, and record the evolutionary stages in an ascending order, including the precursory glacial stage, interglacial stage, principal glacial stage and residual glacial stage, that may be well compared with those appeared in the adjacent areas.