Sedimentary characteristics of distributive fluvial system in arid area: A case study of the Shule River distributive fluvial system, NW China

ZHANG Xianghui,ZHANG Changmin,FENG Wenjie,XU Qinghai,ZHU Rui,LIU Shuai,HUANG Ruoxin

Table 3 Sedimentary microfacies developed in different belts of the Shule River DFS and their sedimentary characteristics.

Position Grain size Sorting Roundness Directionality Hydrodynamic force Microfacies Proximal Medium to boulder Poor Subrounded Clear Traction flow Braided channel, flood plain Middle Fine to medium gravel, sandy lamina Moderate Subrounded Certain Traction flow Braided channel, flood plain, aeolian dune Distal Fine gravel, thick sand Good Subrounded to rounded Ambiguous Traction flow Braided channel, meandering channel, flood plain, aeolian dune, swamp, lake