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衡阳盆地地洼构造层申的白垩-下第三系,是一套典型的陆相山麓洪积-湖泊沉积,其中具有许多浊积物,其证据有浊流型卷曲层理和滑坡型卷曲层理、递变层理、多种类型的同生角砾岩,以及由“鉴别沉积环境的粒度参数综合公式”显示的浊流砂岩等。分析它们的形成机理,可以划分出两个生因类型:一是三角洲斜坡上或同生断裂带的沉积物,在古地震等触发下发生滑动所致;二是近源短途河流暴发性的高密度洪水冲入湖底造成的。这些浊积物有类似于布马垂直层序和布马圆锥形平面分布的情况。有证据表明,这些浊积物对铀,铜等沉积矿产具有同生富集作用。
The Cretaceous-Lower Tertiary in the structural depression of Diwa in the Hengyang Basin is a typical set of alluvial-lacustrine sediments of continental foothills with many turbidites evidenced by turbidite-type curling and landslide-type curling Stratified bedding, multiple types of symbiotic breccias, and turbidite sandstones identified by the Synthetic Formula for Identifying Sedimentary Environment Particle Size Parameters. Analysis of their formation mechanism can be divided into two types of genesis: First, the sediments on the deltaic slope or in synsedimentary fracture zone, caused by the slip caused by the ancient earthquakes and other caused; the second is the source of short-haired rivers outbreak of high Flood density caused by the influx of the lake. These turbidimeters have similarities to Buma’s vertical sequence and Buma’s conical plane distribution. There is evidence that these turbidites have the symbiotic enrichment of uranium, copper and other sedimentary minerals.