六盘山东麓冲积扇晚更新世以来地层结构及其活动性特征
Stratigraphic architecture and activity of the alluvial fan in the eastern piedmont of the Liupan Mountains since the Late Pleistocene
a—萨拉乌苏组三段顶面发育侵蚀间断面,上覆晚更新世末砾石层;b—萨拉乌苏组三段湖陆过渡相黏土质粉砂,发育有生物钻穴遗迹和石膏晶体;c—晚更新世末冲积相砾石层,砾石主要岩性组成为灰绿色泥灰岩和板岩,呈叠瓦状排列,并发育斜层理;d—晚更新世末河流冲积相冲积层,发育有斜层理;e—晚更新世末河流冲积相冲积层,发育有透镜状层理;f—晚更新世末河流冲积相冲积层,发育有平行层理;g—晚更新世末洪积相细砂层,发育有生物钻穴等生物遗迹和平行层理;h—六盘山东麓冲积扇上晚更新世末马兰黄土,发育有柱状节理
a—the third part of the Salawusu Formation contacts unconformably with the lower Late Pleistocene conglomerates; b—relics of biogenic burrows and gypsum in the argillaceous siltstone of the third part of the Salawusu Formation; c—alluvial facies conglomerates during the Late Pleistocene, the lithologies of the conglomerates are mainly greyish-green marlite and mudstone, the pebbles are aligned in imbricated arrangement; d—Late Pleistocene fluvial facies coarse sand layers with cross beddings; e—Late Pleistocene fluvial facies coarse sand layers with lenticular beddings; f—Late Pleistocene alluvial strata at the end of the alluvial fan with parallel beddings; g—Late Pleistocene alluvial strata at the end of the alluvial fan with parallel beddings and biogenic holes; h—Late Pleistocene Malan loess with columnar joints in the alluvial fan east to the Liupan Mountain
