【摘要】 研究深水牵引流对古大洋环流重建、陆坡位置判断及沉积矿产和能源资源勘探具有重要意义。珠江口盆地白云凹陷中新统珠江组取心段发育丰富的、与远洋低密度浊流和半远洋-远洋悬移沉积有明显区别的深水牵引流沉积,产物包括平行层理细砂岩、双泥岩纹层、双向交错层粉-细粒砂岩、波状层理和脉状层理灰质粉-细粒砂岩、波状层理和脉状层理抱球虫灰岩、透镜状沙纹层理粉砂岩等岩石相类型。珠江组深水牵引流沉积的发现具有重要地质意义,由其可以推测自渐新世末(23.8Ma)白云凹陷陆架坡折带形成之后就开始存在沿着陆架坡折带活动的深水牵引流,并可能影响和改变沉积物的物质组成和区域分布,这将为南海北部古大洋洋流循环重建起到重要启示作用。更多还原

【Abstract】 The research on deep-water tractive deposition is extremely valuable for the palaeooceanographical and palaeoclimatic reconstruction,slope deposition studies and mineral and energy exploration.The abundance of tractive structures developed in Zhujiang formation,Baiyun sag,Zhujiang Basin.They included parallel-bedding fine sandstone and doubling mud layers,bidirectional cross-bedding silty-fine sandstone,wavy-bedding and flaser-bedding globigerina limestone,wavy-bedding and flaser-bedding siltstone and silty-fine sandstone,lenticular-bedding silty-fine sandstones.They were totally different from pelagic turbidite and hemipelagite-pelagite.Combining with the depositional setting,the rich tractive structures were believed as deep-water deposition.The discovery of the deep-water tractive deposition in Miocene Zhujiang formation would be of great importance.It could be inferred that a deep-water current had existed since the formation of the shelf-break during late Oligocene(23.8 Ma) in Baiyun sag,which influenced and controlled the resources and depositional processes in Zhujiang formation.The tractive current may influence and change the composition and its distribution.And this would have a great enlightenment to the reconstruction of the palaeo-ocean circulation in the south china sea.Further studies will be needed.更多还原