西南石油大学学报（自然科学版）2025，Vol.47Issue(1)：67-79,13.DOI:10.11885/j.issn.1674-5086.2024.08.28.07
东非鲁伍马盆地海底峡谷发育特征及成因机制
Developmental Characteristics and Genesis Mechanisms of Submarine Canyons in the Rovuma Basin,East Africa
摘要
Abstract
The external morphological characteristics,internal filling structure and genetic mechanism of submarine canyons in the Rovuma Basin are not fully understood.We make a study on the external morphological characteristics,internal filling structure and genetic mechanism of submarine canyons by using three-dimensional seismic data,combined with the relevant theories of deep-water sedimentology and previous research results.The results indicate that there are 10 canyons in the Rovuma Basin,trending east-west,with a V-shaped narrow upstream and U-shaped gentle downstream profile vertically,and showing an isolated-merged-dispersed pattern on the horizontal plane.The internal filling sediment types in the canyons include basal lags,slides and MTDs.Outside the canyons,sediment drifts and pockmarks are observed.Considering the developmental background of submarine canyons in the study area,it is believed that there may be two genesis mechanisms at play.One involves the escape of natural gas from the underlying strata,leading to the formation of pockmarks and subsequent erosion of weak layers,with interconnected pockmarks forming the initial shape of the canyon,gradually evolving under the influence of sediment-laden fluid flow and erosion.The second mechanism involves destabilization of sediment on the lower slope due to the activity of large-scale faults,resulting in gravity flow events and subsequent erosion leading to canyon formation.关键词
鲁伍马盆地/海底峡谷/地貌特征/沉积特征/成因机制Key words
Rovuma Basin/submarine canyons/geomorphological features/sedimentary characteristics/genetic mechanisms分类
能源科技引用本文复制引用
马宏霞,朱越越,许小勇,何云龙,王红平..东非鲁伍马盆地海底峡谷发育特征及成因机制[J].西南石油大学学报（自然科学版）,2025,47(1):67-79,13.基金项目
国家自然科学基金(41502102,42072137) （41502102,42072137）
