鄂尔多斯盆地西缘桌子山地区上奥陶统拉什仲组深水复合流沉积
李向东, 陈海燕, 陈洪达

Deep-water Combined-flow Deposits of the Upper Ordovician Lashenzhong Formation in Zhuozishan Area, Western Margin of Ordos Basin
Xiangdong Li, Haiyan Chen, Hongda Chen
图4 鄂尔多斯盆地西缘桌子山地区拉什仲组沉积类型
(a) 不完整的鲍玛序列,灰绿色厚层细砂岩底面发育槽模(箭头);(b) 灰绿色厚层砂岩中的复合型条纹条带构造,垂向上具有窄—宽—窄序列;(c) 灰绿色粉砂岩中的“人”字形交错纹层;(d) 灰绿色中层粉砂岩中的包卷层理,垂直变形可呈现紧闭的背形(长箭头)和开阔的向形,背形具有较均一的砂核(短箭头)
Fig.4 Sedimentary types of Lashenzhong Formation in Zhuozishan area, western margin of Ordos Basin
(a) Incomplete Boma sequence, flutes (arrow) on base of grayish green thick-bedded fine-grained sandstone; (b) Compound stripped-and-banded structure with narrow-wide-narrow vertical succession in grayish green thick-bedded sandstone; (c) Chevron cross-lamination in grayish green siltstone; (d) Convolute lamination in grayish green medium-bedded siltstone, note the tight anticline (long arrow) with disorganized sand core (short arrow) and flat syncline