proximal fan
... proximal environment 近源环境 proximal fan 近源冲积扇 proximal realm 近源区域 ...
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盆地西缘距蚀源区近，坡度陡，形成了重力流成因的砾石质水下冲积扇。
The western margin of the basin was close to the source regions and very steep, so that pebbly subaquatic alluvial fans were formed that were deposited from a gravity flow.
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