【摘要】：河南瓦房鉛鋅礦床位于華北克拉通南緣熊耳山—外方山礦集區(qū),礦體賦存于熊耳群雞蛋坪組上段(Chj3)的地層中,礦石礦物有黃鐵礦、方鉛礦、閃鋅礦和少量黃銅礦、赤鐵礦、褐鐵礦。該礦床熱液成礦過(guò)程劃分為3個(gè)階段:石英-黃鐵礦階段(早階段),石英-多金屬階段(中階段),石英-碳酸鹽脈階段(晚階段)。礦石中石英和方解石中捕獲的原生包裹體類型有NaCl-H2O型兩相、NaCl-CO2-H2O型三相和純氣相。氣液兩相包裹體3個(gè)階段均一溫度范圍分別為150~260、150~230和110~160℃,3個(gè)階段鹽度(w(NaCl))平均值分別為12.22%、8.55%和6.29%。中階段方解石的δ13 CVPDB平均值為-7.34‰,δ18 OSMOM平均值為15.56‰;晚階段方解石的δ13 CVPDB平均值為-3.05‰,δ18 OSMOW平均值為2.21‰。早階段硫化物的δ34S值為2.747‰~7.737‰,中階段硫化物的δ34S值為-11.187‰~7.286‰。認(rèn)為早中階段成礦流體為變質(zhì)流體,與中生代揚(yáng)子克拉通和華北克拉通發(fā)生陸陸碰撞誘發(fā)中—新元古代時(shí)期的俯沖板片變質(zhì)脫水有關(guān),成礦晚階段流體有大氣降水的混入。硫同位素表明硫來(lái)源于中—新元古代的沉積地層,是海相硫酸鹽的還原產(chǎn)物,在晚階段,由于大氣降水的混入導(dǎo)致δ34S出現(xiàn)負(fù)值。瓦房鉛鋅礦床地質(zhì)特征、成礦流體特征與造山型礦床相似,因此,瓦房鉛鋅礦床屬于造山型鉛鋅礦床。
[Abstract]:The Wafang lead-zinc deposit in Henan Province is located in the Xiong 'ershan-Waifangshan ore concentration area on the southern margin of the North China Craton. The orebody occurs in the upper member of the Qiuping formation (Chj3) of the Xiongerqun formation. The ore minerals include pyrite, galena, sphalerite and a small amount of chalcopyrite and hematite. Limonite. The hydrothermal metallogenic process of the deposit can be divided into three stages: quartz-pyrite stage (early stage), quartz-polymetallic stage (middle stage) and quartz-carbonate vein stage (late stage). The types of primary inclusions trapped in quartz and calcite in ores are NaCl-H2O type two-phase NaCl-CO2-H2O three-phase and pure gas phase. The homogenization temperature ranges for the three stages of gas-liquid two-phase inclusions are 150 ~ 260150 ~ 230 鈩，

本文編號(hào)：2230620