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研究区位于安徽绩溪县杨溪镇,区内主要发育一套新元古代浅变质碎屑岩系,厚度为639.7m。碎屑岩以泥岩、泥质粉砂岩、砂岩、含砾砂岩和砾岩为主,发育水平层理,粒序层理,韵律层理等沉积构造,可见鲍马层序Ta、Tc、Td、Te段。碎屑组分以跃移组分为主,含量为35%~58%。地层上段厚为254.8m,包含粉砂岩、泥质粉砂岩和粉砂质泥岩,水平层理和粒序层理发育,为中扇一外扇扇叶沉积;中段厚为192.5m,主要为细砂岩、粉砂岩和泥质粉砂岩,砂岩条带广泛发育,属于中扇水道沉积;下段厚为192.4m,为一套砾岩层,砾石分选较差,砾岩层间夹有粉砂质泥岩,为上扇水道滞留沉积。总体上,形成一套退积的海底扇沉积序列。
The research area is located in Yangxi Town, Jixi County, Anhui Province. There are mainly Neoproterozoic metamorphic clastic rocks with a thickness of 639.7 m. Clastic rocks are mainly composed of mudstone, muddy siltstone, sandstone, gravelly sandstone and conglomerate, and developed sedimentary structures such as bedding, grained bedding and rhythmic bedding. The results show that the sequence of Taocai, Tc, Td, Te segment. Debris components to the main component of the jump, the content of 35% to 58%. The upper part of the stratum is 254.8m thick and contains siltstone, argillaceous siltstone and silty mudstone. Horizontal bedding and grading bedding development are mid-fan and outer fan-leaf deposits. The middle part is 192.5m thick, mainly thin Sandstone, siltstone and argillaceous siltstone. Sandstone belts are widely developed and belong to fan-water channel sedimentation. The lower section is 192.4 meters thick, which is a conglomerate layer with poor sorting of gravel, silt mudstone between conglomerate layers, Deposition for the fan channel deposition. In general, a set of retrograde subsea fan sedimentary sequences is formed.