旋回阶梯底形的动力地貌及其相关沉积物发育特征

发布时间：2018-05-15 20:14

  本文选题：旋回阶梯 + 水跃　； 参考：《地质论评》2017年06期

【摘要】：旋回阶梯(Cyclic Step)是一种与斜坡相关的、向上迁移的、具有周期性水跃特征的底形,广义上还包括了冲槽与冲坑。基于迎流面沉积作用和背流面侵蚀作用的主导程度可将其划分为主沉积型和主侵蚀型两类。旋回阶梯具有长波长的特征,其波高比通常大于10。海(湖)底旋回阶梯的形成与坡度有很大的关系,其坡度范围通常为0.25°~2°,很少超过10°。与该种底形相关的沉积具有不对称透镜状或匙状纵切面形态,主要以块状或递变沉积及后积层发育为主要特征,其中以超临界浊流沉积和大规模向上迁移的沉积物波最为典型。旋回阶梯底形广泛分布于世界上绝大多数沉积环境中,其地貌动力学和相关沉积学研究对于"源—汇"系统、过程—产物具有重要意义。
[Abstract]:Cyclic step is a kind of bottom shape related to slope, upward migration and periodic hydraulic jump, and it also includes scour and scour in a broad sense. Based on the dominant degree of sedimentation and backflow erosion, it can be divided into two types: main sedimentary type and main erosion type. The cycle ladder is characterized by a long wavelength, the ratio of wave height is usually greater than 10. 5%. The formation of the sea (lake) bottom cycle ladder is closely related to the slope, which usually ranges from 0.25 掳to 2 掳and rarely exceeds 10 掳. The deposits associated with the bottom shape of this species are characterized by asymmetric lenticular or spatulate longitudinal section, mainly characterized by block or progressive deposition and the development of the posterior layer, among which the supercritical turbidite deposition and the massive upward migration of sediment waves are the most typical. The bottom shape of the cyclic ladder is widely distributed in most sedimentary environments in the world. The geomorphological dynamics and related sedimentology are of great significance for the "source-sink" system, process-product.
【作者单位】： 油气资源与工程国家重点实验室;中国石油大学(北京)地球科学学院;
【基金】：国家科技重大专项(编号:2017ZX05001-002)资助的成果~~
【分类号】：P512.2;P931
，

本文编号：1893786