拉尔玛海底喷流成因硒-铜-铀-镍-钼-铂族元素-金矿床

西秦岭南亚带的拉尔玛Se-Cu-U-Ni-Mo-PGE-Au矿床是迄今为止我国仅见的与海底喷流作用有关的金矿床。它赋存于寒武系太阳顶群中，受地层控制明显。太阳顶群由硅岩、泥质硅岩和板岩组成，厚度近千米。现已发现的矿体，80%以上产于硅岩中。控矿的硅岩乃海底喷流的产物，海底喷流作用也导致了Au、PGE、Se以及其它成矿元素的富集，是贵金属元素的主要来源。尤为重要的是，近来在硅岩中发现了Se的矿化现象。因此该矿床是一个较典型的、海底喷流成因的硒-贵金属矿床。

LAERMA Se-Cu-U-Ni-Mo-PGE桝u DEPOSIT OF SUBMARINE EXHALATIVE GENESIS IN LAERMA

Laerma Se-Cu -U -Ni -Mo -PGE -Au deposit located in the south subzone of the western Qinling is the only gold deposit related with submarine exhalative sedimentation in China. The deposit is controlled by the strata and occurs in the Cambrain Taiyangding group which is about 1000 meters thick and is composed of silicalite, palitic silicanlite and slate. More than eighty percent of the orebodies are present in silicalite. The silicalite controlling orebodies is a product of submarine exhalative sedimentation. The action also lead to the concentration of Au, PGE, Se and other metallogonic elements, which ore principal source of precious metal elements. It is of much significace to discover Se -mineralization in silicalite at present. So, the deposit is typical and unconventional Se-precious metal deposit.