alluvial placer deposit的意思|示意

Placer tin deposit in xupu occurs in alluvial sediment of quatemary system and cassiterite chiefly concentrates at the bottom of gravel layers.

溆浦砂锡矿床赋存在第四系冲积层中锡石主要富集在底部砂砾石层。

Placer tin deposit in Xupu occurs in alluvial sediment of Quatemary SyStem and CaSSiterite chiefly concentrates at the bottom of Gravel layers.

溆浦砂锡矿床赋存在第四系冲积层中，锡石主要富集在底部砂砾石层。

The basin was filled with thick sediments of Quaternary lake and alluvial facies and accumulated with tin placer which is locally enriched to be commercial deposit.

盆地中充填有第四纪湖相-冲积相厚层沉积，有砂锡聚集，局部富集成矿床。