贵州东南部下江群内波、内潮汐沉积的发现及其地质意义  

The Discovery and Geological Meaning of Xiajiang Group’s Internal Wave and Internal-Tide Deposits in Southeastern Guizhou Province

作　　者：卢定彪 吴开彬 跃连红 黄文俊 邓贵标 

机构地区：[1]贵州省地质调查院,贵州贵阳

出　　处：《地球科学前沿（汉斯）》2018年第6期1013-1023,共11页Advances in Geosciences

基　　金：中国地质调查局地调科研项目(编号:121201010000150011-09);中国地质调查局地质调查项目(编号:121201003000172718)。

摘　　要：广泛出露于贵州东南部及其毗邻地区的下江群,为一套巨厚的,以浊流沉积为主、伴有滑塌-滑移沉积和水道沉积的复理石建造。其主体部分普遍发育波痕、交错层理、脉状层理、透镜状层理等牵引流成因的特殊沉积构造。通过对这些特殊沉积构造进行系统观察和统计分析,结合伴生的已经证实的沉积类型,本文提出该区域内下江群中存在内波、内潮汐沉积,并对内波、内潮汐沉积特征进行描述。为合理解释以重力流沉积为主体的沉积体系中,牵引流沉积成因的沉积构造提供了一种新思路,为下江群沉积环境分析、新元古代南华裂谷盆地演化分析提供了新的证据。Xiajiang Group is widespread along southeastern Guizhou Province. It is a suit of thick flysch formation, which mainly has turbidite deposits, accompanied by slump-sliding deposits and channel deposits. Its main section widely developed special sedimentary structures, such as ripple marks and cross, falser and lenticular bedding. These are caused by tractive current. By systematic observation, statistical analysis and confirmed type of deposits, this paper proposes and describes the characters of the internal wave and internal-tide deposits in Xiajiang Group. This paper offers new ideas for explaining the sedimentary structure caused by tractive current in depositional system, which mainly consists of gravity flow deposits. Meanwhile, it provides evidence for analysis of Xiajiang Group’s depositional environment and development of Neoproterozoic Nanhua rift basin. 

关 键 词：内波 内潮汐 沉积作用类型 斜坡-盆地沉积环境 下江群 贵州东南部 

分 类 号：P5[天文地球—地质学]