苏南L铅银矿成矿特征及找矿前景浅析

A Brief Analysis on the Metallogenic Features and Ore searching Prospects of A Lead Silver Orebody in South Jiangsu

区内中生代火山岩—次火山岩发育，铅银矿脉（囊）成群集中分布，具有“小、浅、富”的特点，成因为“火山—次火山含气热液”成矿，矿石类型为块状硫化物型。在斜歪背斜北侧，为一构造与火山—次火山复合作用的沉降凹陷区，弱磁异常规模较大，锰矿化发育，可与特富矿脉部位的弱磁异常、锰矿化相类比，可能存在具一定规模的银、铅（铜、锌、硫）矿体。

The Lead Silver orebody of this region lies in the middle and southern sections of Maoshan Hill and the southeastern border of Lishui volcanic basin. Mesozoic volcanic to subvolcanic rocks are well developed. Lead Silver ore veins(chambers) are cocentrated in groups along the developed parts of faulted structures, being characterized by “small,shallow and abundant”. The metallogenetic origin is deemed to be “volcanic to subvolcanic gas bearing hydrothermal solution”. The ore type is massive sulfide with pyrite as its main mineral and silver bearing galena as secondary mineral. The ores are rich in volatile elements of F, As, Sb and Hg etc. On the northside of inclined anticlines, there is a subsided sag formed by volcanic to subvolcanic complex effect with structure, and a large sized slight magnetic anomaly developed with manganese mineralization which may be analogized with those around the ore vein parts of special abundance, so there is a possible existence of an orebody of silver, lead(copper, zinc and sulfur) in the subsided sag.