鄂尔多斯盆地西南缘上奥陶统平凉组砂岩微量元素特征及构造背景: 以陇县段家峡剖面为例*
刘朱睿鸷1,2, 何幼斌2, 李华2, 黄伟2

Geochemical characteristics of trace elements and tectonic setting of sandstones from the Upper Ordovician Pingliang Formation, southwestern margin of Ordos Basin: A case study of the Duanjiaxia profile, Longxian County
Liuzhu Rui-Zhi1,2, He You-Bin2, Li Hua2, Huang Wei2
陕西陇县段家峡剖面上奥陶统平凉组砂岩特征 a=—灰色薄层砂岩,发育平行层理和交错层理,垂向上构成不完整的鲍马序列;b—灰色中层砂岩,垂向上构成不完整的鲍马序列;c—灰色中层砂岩,底部发育槽模;d—灰色中层砂岩,发育块状层理,底部发育冲刷面;e—中—厚层砂岩夹薄层泥岩;f—石-O2P-1-1细砂岩,可见中砂,以石英(Qtz)为主,可见砂屑(Ls),钙质(Cal)胶结,正交偏光;g—薄层砂岩与页岩互层;h—石-O2P-15-1细砂岩,粒度较f图片中的稍细,以石英(Qtz)为主,可见变质岩屑(Lc),正交偏光