摘要
碱性岩及其相关的金矿研究已成为一个新的研究热点。通过对国内外碱性岩及与其相关的金矿特征的总结，并与辽宁碱性岩及其相关的金矿对比，发现本地区碱性岩金矿化率较高，尤其是碱性侵出（入）岩比其它任何岩类的成矿率都要高。大石沟、南大线和东五家子、长皋、线金厂等金矿床是典型的与碱性岩有关的金矿床，前二个金矿床与早白垩世晚期破火山口构造、末期次火山侵出相粗面岩有关，后三者与中生代脉状侵入的煌斑岩脉有关。另外还有与正长岩、霓辉岩有关的金矿点。辽宁与碱性岩相关的矿床形成时代晚于碱性岩，主要为浅成热液型金矿床，矿化类型以脉状为主，或为含金构造蚀变岩，或为含金石英脉，矿种以金为主，多伴生银和铜，矿床形成温度以中低温为主。有些金矿点金品位较高，具有一定的矿化规模，附近有金的重砂和化探异常显示，成矿条件有利，找矿前景很好，甚至是极有可能获得突破的重要靶区。建议对于这类成矿预测区予以特别注意。
Alkaline rocks and alkalic rock related gold deposits have become a new researching topic on mineral deposit geology.Through correlation with the typical alkaline rocks and alkaline rock related gold deposits in the world,it is considerded that alkaline rock related gold deposits in Liaoning province are higher in mineralized rate than any other types of rocks,especially extrusive(intrusive) alkaline rocks. Dashigou,Nandaxian,Dongwujiazi,Changgao,Xianjinchang gold deposits are typical alkaline rock related gold deposits in Liaoning province. The former two are related with a caldera of the late stage of Early Cretaceous and with subvolcanic extrusive facies trachyte at the end of Early Cretaceous. The latter three are related with lamprophyre veins of Mesozoic. There are also some gold occurrences related with syenite and aegirinolith. Alkaline rock related gold deposits formed later than alkaline rocks in Liaoning province,mainly belonging to hypabyssal hydrothermal gold deposits with a vein shaped alteration type: gold bearing altered rock veins or gold bearing quartz veins.The major metallogenic element is gold, associated with silver and copper. The ore forming temperature is low to moderate. Grade of some gold occurrences is higher with a larger scale of mineralization,where there show placer and geochemical exploration anomalies nearby with favourable metallogenic conditions and optimistic prospects for searching for gold deposits.Even it is possible to outline important metallogenic targets.So it should be paid more attention to this kind of metallogenic prognostic province.
关键词
辽宁
碱性岩
金矿床
成矿区
找矿方向
Liaoning, Alkaline rock, Gold deposit, Metallogenetic area(belt)
