本文選題：旋回階梯 + 水躍　； 參考：《地質(zhì)論評》2017年06期

【摘要】：旋回階梯(Cyclic Step)是一種與斜坡相關(guān)的、向上遷移的、具有周期性水躍特征的底形,廣義上還包括了沖槽與沖坑。基于迎流面沉積作用和背流面侵蝕作用的主導程度可將其劃分為主沉積型和主侵蝕型兩類。旋回階梯具有長波長的特征,其波高比通常大于10。海(湖)底旋回階梯的形成與坡度有很大的關(guān)系,其坡度范圍通常為0.25°~2°,很少超過10°。與該種底形相關(guān)的沉積具有不對稱透鏡狀或匙狀縱切面形態(tài),主要以塊狀或遞變沉積及后積層發(fā)育為主要特征,其中以超臨界濁流沉積和大規(guī)模向上遷移的沉積物波最為典型。旋回階梯底形廣泛分布于世界上絕大多數(shù)沉積環(huán)境中,其地貌動力學和相關(guān)沉積學研究對于"源—匯"系統(tǒng)、過程—產(chǎn)物具有重要意義。
[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 擄to 2 擄and rarely exceeds 10 擄. 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.
【作者單位】： 油氣資源與工程國家重點實驗室;中國石油大學(北京)地球科學學院;
【基金】：國家科技重大專項(編號:2017ZX05001-002)資助的成果~~
【分類號】：P512.2;P931
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本文編號：1893786