【摘要】 早寒武世清虚洞组沉积时期湘西地区为一广阔的碳酸盐缓坡,该缓坡可分为浅水缓坡带和深水缓坡带。本区的深水缓坡带可识别出原地正常沉积、重力沉积(包括低密度浊流沉积、碎屑流沉积和滑塌沉积)和等深流沉积3种成因类型的碳酸盐岩,依据岩性及其组合特征又可将深水缓坡带区分为上部缓坡和下部缓坡两部分。纵向上,清虚洞组具明显的沉积旋回性。建立了一个综合性三维碳酸盐缓坡相模式,讨论了其与湘西黔东中晚寒武世斜坡的本质差异。图3参4更多还原

【Abstract】 During Qingxudong age of early Cambrian there is an extensive carbonate ramp in west Hunan. Distinctive facies zones in the ramp are recognized: (A)shollow-water ramp and (B)deep-water ramp. At the deep-water area of the ramp three types of carbonate rocks are indentified as ① antochthonous sediments, ② gravity deposits including siliding and sluping sediments, low-density turbidity current and grain flow deposits, and ③ contourite current deposit. On the basis of the characteristics of the rocks associations, the deep-water ramp is subdivided into upper and lower part. A carbonate ramp model in three-dimension has been presented in the paper.更多还原