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上石炭统“冰筏”沉积岩地质剖面位于拉萨北70km的林周县乌鲁龙—马驹拉。剖面底部为黑色含砾粉砂质泥岩和黑色粉砂质泥岩,厚200m。中部为黑色粉砂质泥岩,厚200m。上部为深灰色泥灰岩,厚50m。上石炭统与上覆二叠系浅灰色灰岩呈整合接触。“冰筏”沉积岩具有如下地质地球化学特点: 1.岩石组合“冰筏”沉积岩主要由黑色粉砂质泥岩、含砾砂岩、砂砾岩等组成。砾石粒径一般为1—2cm,最大可达10—20cm。砾石成分比较复杂,有花岗岩、
The geological profile of the Upper Carboniferous “raft” sedimentary rock is located in Urumu-Majuola, Linzhou County, 70km north of Lhasa. The bottom of the profile is black gravelly silty mudstone and black silty mudstone, 200m thick. The middle of black silty mudstone, 200m thick. The upper part is dark gray marl, thickness 50m. The Upper Carboniferous and the Upper Permian pale-gray limestone are in integrated contact. The “raft” sedimentary rocks have the following geo-geochemical features: 1. The rock assemblage “raft” sedimentary rocks are mainly composed of black silty mudstone, gravel sandstone, glutenite and the like. Gravel diameter is generally 1-2cm, up to 10-20cm. Gravel composition is more complicated, with granite,