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标题:和我游湘西带你畅游苗疆

作者:蓉城情人

日期:2006-04-08 16:35

内容: [color=blue][size=4]神奇相西 [/size] 第一节地层湘西州域地层横跨场子、华南两大一级地层区，含中元古界至第四系58个地层单元，除缺石炭系、侏罗系、第三系之外，大部分地层层序完整，分层标志明显，沉积类型复杂，横向变化明显，尤以古生界为著。古生物化石丰富，种类繁多，过渡特色明显。各系地层分布范围比较集中，区分明显，出露面积约占州境总面积的98．5％。一、中元古界冷家溪群冷家溪群在湘西州境出露为最老地层，仅分布在古丈县大溪至永顺县镇溪一带。属中元古界，为一套浅灰、浅灰绿色为主的浅变质细砂碎屑岩、粘土岩及含凝灰质细粒碎屑岩组成的复理石建造。按岩性特征分为上下两段：上段为砂质板岩段，主要由灰绿色砂质板岩、粉砂质板岩及变质细砂岩互层；下段为板岩段，主要由灰色、灰紫色千枚状板岩、条带状砂质板岩组成。总厚1，640米，以明显角度不整合伏于板溪群马底驿组之下。二、上元古界板溪群板溪群在湘西州境分布在古丈背斜轴部，另在凤凰、泸溪、花垣等地背斜核部亦有出露，呈高角度不整合覆于冷家溪群之上。为紫红色、灰绿色为主的浅变质砂岩、砂砾岩、砂岩、粉砂岩及板岩组成的两大沉积旋回。按岩性组合、沉积旋回等特征，自下 ..

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2006-04-08 16:36

蓉城情人

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2006-04-08 16:36

蓉城情人

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2006-04-08 16:39

蓉城情人

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2006-04-08 16:41

蓉城情人

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2006-04-08 16:42

蓉城情人

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