宁夏海原县马场沟金矿地质特征及其矿床成因

Geological feature and origin of Machanggou gold deposit in Haiyuan County of Ningxia

对宁夏海原县马场沟金矿地质特征及其矿床成因进行了研究.结果发现,马场沟金矿赋存西华山弧形推覆构造带上,成矿地层为中元古界蓟县系海原群地层;金矿体、矿化体主要集中分布在呈北西西向搌布的含矿构造带上,含矿总体长度达3.5km,并且显示西部收敛、东部撒开的帚状排列型式.矿区内已发现的14个金矿体、矿化体主要有煌斑岩型、石英脉型、蚀变岩型3种矿石类型,以煌斑岩型为主,石英脉型为次,蚀变岩型少量.矿床成因与区域变质、区域构造、岩浆活动关系密切,矿床成因类型属变质-热液型金矿床.

Gold deposit geological feature and ore deposit origin of Machanggou of Haiyuan County in Ningxia are studied. The results shows, the ocurrence of the gold ore is on the West Huashan arc nappe structure, the mineralization stratum is the Haiyuan group stratum of proterozoic section of Jixian;the gold ore body and mineralized body mainly spread on northwest ore belt, its length reaches 3.5 km, and its shape likes broom which is dispersive in east and constrictive in west. On the mineral zone, 14 gold ore bodies and mineralized body which have been discovered, main composition is bright porphyry, second is quartz vein, and altered mineral is the less. Genesis of deposit is closely related to regional metamorphism, regional structure and magma activity, its type is a metamorphic deposit-hydrothermal gold deposit.