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1.地层建造组成的基本特征湘东前震旦系地层分布广泛,约占全区地层出露面积的60％,为一套巨厚的浅变质岩系,以冷家溪群为区内最古老的地层,岩性为灰绿色变火山岩和以板岩为主夹变质复矿砂岩,板岩一般呈厚层状,岩性较单一,下部变基性火山岩发育,中下部为流纹质凝灰岩及凝灰质板岩。其上板溪群为一套厚约2000余m的碎屑岩建造,复理石韵律甚为明显,与下伏冷家溪群为整合至假整合接触,岩性为变质复成份砂岩、含砾
1. Basic Features of Stratigraphic Constructions The former Sinian strata in eastern Hunan are widely distributed, accounting for about 60% of the exposed area of the whole strata. They are a set of super-thick super-metamorphic rock series with the Lengjiaxi Group as the oldest , Lithology of gray-green volcanic rocks and slate-hosted metamorphic complex sandstone. The slate generally has a thick layer with relatively simple lithology. The lower metamorphic volcanic rocks develop with rhyolitic tuffs in the middle and lower parts, Tuff slate. The upper Banxi Group is a set of clastic rocks with a thickness of about 2000 m. The rhythm of the flysch is quite obvious. It is in conformity with the underlying cold Jiaxi Group for integration to the fake integration. The lithology is metamorphic complex sandstone, gravel