双山子太古代绿岩带金矿的基本特征

摘要

文章简要介绍了双山子太古代绿岩带的基本特征,指出双山子绿岩带同加拿大阿比提比绿岩带有许多相似之处；论述了绿岩带中三期不同类型金矿的各自主要成矿地质特征,指出早期含金石英脉是太古代的产物,为冀东地区典型的太古代绿岩带金矿；毒砂型金矿可能是太古代最晚期的产物；晚期石英脉型金矿形成于燕山期.在该区东部南北长约30km的矿带中,断断续续分布许多金矿或矿化点,三期成矿范围大体一致,并且与区内三个大的As、Sb异常相对应,说明三期金矿化常出现相互叠加的现象,推测出绿岩带东部自太古代以来存在一个隐伏的或已被改造的深大控矿断裂构造,沿这个带从太古代—中生代发生多次金成矿作用.查明绿岩带成矿地质特征,对在该地区寻找金矿有重要指导意义；在迎午山—西汗沟绢云母石英片岩带中是否存在较大的透镜体或较密的透镜体,是否还有燕山期金矿,是今后找矿中特别值得注意的.%This paper introduces the basic characteristics in Archean greenstone belts of Shuangshanzi, and points out there are many similarities between Shuangshanzi greenstone belts and Canadian Abitibi greenstone belts. Three different types of gold deposits in greenstone belts possess major geological features respectively. Early gold-bearing quartz veins are the product of Archean, it's typical gold deposit of the Archean greenstone belts in the eastern Hebei province. Arsenopyrite type gold deposits may be the most terminal product of Archean. Late quartz vein type gold deposits formed in stage of Yanshan. In about 30 km long ore belts from south to north, there are intermittent distribution of gold deposits or gold mineralization spots, the range of three metallogenic phases are roughly consistent and correspond with the three big As,Sb anomalies. The above indicate that three phases of gold mineralization often show phenomenon of superposition, and presume that there is a concealed or transformed deep and large ore-controlling faults in the eastern part of greenstone belts since Archean times. Along greenstone belts gold mineralization took place many times from Archean to Mesozoic. It is believed that the geological features of mineralization in greenstone belts have important guiding significance for searching gold deposits in this region. Confirmation of whether there is the bigger lens or the dense lenses in sericite-quartz schist belts of Yingwushan-Xihangou, whether there are still Yanshan period gold deposits to be discovered, are particularly noteworthy in prospecting in the area.