扬子西南缘滇中成冰系南沱组沉积特征及其上红层归属讨论*
祁柯宁1,2, 旷红伟1, 柳永清1, 彭楠1, 王玉冲1,3, 陈骁帅1

Sedimentary characteristics of the Cryogenian Nantuo Formation and stratigraphic attribution of red beds in central Yunnan, southwestern margin of Yangtze Craton
QI Kening1,2, KUANG Hongwei1, LIU Yongqing1, PENG Nan1, WANG Yuchong1,3, CHEN Xiaoshuai1
滇中鲁纳村剖面南沱组柱状图和典型沉积特征 a—澄江组紫红色粗砂岩和南沱组杂砾岩之间不整合面; b—南沱组冰碛杂砾岩,砾石叠瓦状排列呈交错层理状; c—南沱组底部分选差、次圆—次棱角为主、杂基支撑、紧密堆积的中粗砾岩; d—多层叠瓦排列的中—粗砾岩,呈大型类槽状交错层理状; e—中—粗砾岩夹细砾岩透镜体; f—过渡段红层紫红色粉砂岩和细砂岩,发育斜层理; g—南沱组下段砾岩顶部向上砾石逐渐变小且减少; h—过渡段粉砂岩底部见双向交错层理; i—过渡段粉砂岩底部见细砾漂砾