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一、地质概况丹江口左岸联接段分布着元古界郧阳系付片岩及火成岩(变质辉绿岩和变质闪长玢岩)。火成岩与片岩成混熔接触,片岩走向为60～70°西,倾向北东,倾角42～65°。片岩片理发育,一般具有鳞片花岗变晶结构或变余砾状结构,主要矿物成分为石英、绿泥石、长石、云母等。各层岩性甚为复杂,岩石强度软硬不均,并有原生软弱夹层分布于各层之间。根据岩性结构等特征,将坝区片岩大致归纳为如下6层(见图1): 1.含磁铁矿的绿泥石石英片岩:厚度1.2～2.5米,与火成岩接触处有0.3～0.5米的混合岩带。 2.厚层石英绿泥石片岩:厚度3.5～5.6米。
First, the geological overview Danjiangkou left bank junction is distributed in the Proterozoic Yunyang Department of palaemites and igneous rocks (metamorphic diabase and metamorphic diorite rock). The igneous rocks and the schists are mixed and melted into contact with each other, with the slate moving toward the west of 60-70 °, with a northerly dip and a dip angle of 42-65 °. Slate lithology development, generally with scale granitic crystal structure or change clumpy structure, the main mineral composition of quartz, chlorite, feldspar, mica and so on. The lithology of each layer is very complicated, the strength of the rock is hard and soft, and the primary weak interlayer is distributed between the layers. According to lithological structure and other characteristics, the dam of the dam area can be roughly divided into the following six layers (see Figure 1): 1. Magnetite-bearing chlorite quartz schist: thickness of 1.2 to 2.5 m, and igneous contact at 0.3 ~ 0.5 M mixed rock belt. 2. Thick quartz chlorite schist: thickness of 3.5 to 5.6 meters.