辽宁省岫岩县横山里铅锌矿床地质地球化学特征及矿床成因

横山里铅锌矿床位于华北地台辽—吉裂谷成矿带内,矿体呈脉状赋存于辽河群高家峪组黑云母斜长片麻岩中。通过对矿区地质特征及岩(矿)石主量、微量元素地球化学特征的研究,进而探讨了矿床成因类型。矿床地球化学显示,岩(矿)石具高硅铝、富钾的特点,富集大离子亲石元素,轻稀土元素富集,重稀土曲线呈平坦型,Sr、Ta、Nb、P、Ti元素具有明显的亏损,并具有明显的负Eu异常。根据野外调查,并结合矿石矿物组成及组构特征,将矿床成矿作用划分为沉积-变质成矿期和岩浆热液改造成矿期,以沉积-变质成矿期为主。综合研究确定横山里铅锌矿床成因类型为沉积变质-岩浆热液叠加改造型。

Geological-geochemical characteristics and genesis of Hengshanli Lead-Zinc Deposit in Xiuyan County,Liaoning Province

The Hengshanli Lead-Zinc Deposit sits within Liao-Ji rift metallogenic belt.Its orebody is in veins, mainly hosted in biotite plagiogneiss in the Gaojiayu Formation of Liaohe Group.Based on the study of the geological characteristics of the deposit and the geochemical characteristics of major and trace element in rocks( ores) ,the gene-sis of the deposit was discussed.The geochemistry showed that the rocks(ores)in the deposit were characterized by high silicon aluminum content and rich potassium;LILE and LREE were enriched;HREE curve was flat;Sr,Ta,Nb, P and Ti elements had significant loss and negative Eu anomaly.According to outdoor investigation and the mineral composition and structure,the metallogenic stages were divided into the depositional-metamorphic metallogenic stage, which was the main stage,and the magmatic hydrothermal metamorphic stage.According to the comprehensive study, the genesis type of Hengshanli Lead-Zinc Deposit is determined as a sedimentary metamorphism-magmatic hydro-thermal reformation deposit.