南秦岭钡成矿带钡矿床物质组成及毒重石成因研究
发布时间：2018-07-22 10:44
【摘要】：南秦岭大巴山地区发育了世界上极为罕见的大型钡成矿带。该成矿带钡矿物种类十分丰富。通过对南秦岭钡成矿带钡矿床的电子探针研究,并结合前人研究成果,发现南秦岭大型钡成矿带中钡主要以重晶石、毒重石、钡解石、菱钡镁石、钡长石、汉江石、安康矿、钡冰长石、含钡钒云母等形式存在;硫化物以黄铁矿、闪锌矿为主,并含有少量的针镍矿、硫钒铜矿、蓝辉铜矿、斑铜矿、黄铜矿。此外,还发现少量钒钛氧化物。毒重石中的C主要来源于有机质,且δ13C值为-10.9‰~-21.0‰,与TSR成因的δ13C值相匹配;Sr同位素研究表明毒重石在形成过程中有富含贫放射性成因锶的热水加入;根据Sr同位素计算的盐度值较流体包裹体计算的盐度值高,表明毒重石的形成过程中混合水体盐度降低,暗示毒重石形成过程中可能有水生成;毒重石的包裹体均一温度结果显示,毒重石的形成温度介于118~303.7℃,有利于TSR的发生。此外,钡成矿带中的硫化物种类及S同位素研究结果也均与TSR相符合。根据毒重石的C同位素、Sr同位素、包裹体温度及毒重石成矿亚带的重晶石集硫化物的S同位素研究结果,表明毒重石的形成于热化学硫酸盐还原作用(TSR)相关。赋矿围岩及钡矿石的岩石地球化学特征表明:硅质岩主要形成于深海-半深海的缺氧环境,具有热液和生物混合成因的特点;钡矿石及围岩的Th/U值介于0~2之间,δU值1,表明钡矿石及赋矿围岩形成于缺氧环境。钡矿石及赋矿围岩围岩中Mo与U、V、Cr呈良好的正相关关系,表明当时钡矿石及围岩的形成环境为与海底水体的还原环境相一致。赋矿围岩具有较高的(U+V)/(U+V+Mo)值和Mo含量,暗示了赋矿围岩的沉积环境为极其还原环境甚至可能出现硫化的还原环境;重晶石成矿亚带中钡矿石中(U+V)/(U+V+Mo)值较高,而Mo含量较低,表明其在富集V和U时,并不富集Mo元素,暗示了重晶石成矿亚带的沉积环境为亚氧化-还原的沉积环境;毒重石成矿亚带中钡矿石的(U+V)/(U+V+Mo)值较高,而Mo含量也相对较高,暗示了毒重石成矿亚带的沉积环境为极其还原环境,表明毒重石成矿亚带的沉积环境较重晶石成矿亚带更为还原;赋矿围岩中Mo含量较钡矿石高,说明围岩的形成环境较钡矿石更为还原。
[Abstract]:A rare large barium metallogenic belt in the Dabashan area of southern Qinling Mountains has been developed. The variety of barium minerals in this metallogenic belt is very rich. Through the study of the electron probe of barium deposits in the southern Qinling Mountains barium metallogenic belt and the previous research results, it is found that barium in the large barium metallogenic belt in southern Qinling Mountains is mainly barite, poisonous stone, barium Dite, barium, barium and barium. Feldspar, Hanjiang stone, Ankang ore, barium feldspar and barium vanadium feldspar exist in the form of barium vanadium mica; sulfide is mainly pyrite and sphalerite, and contains a small amount of nickel ore, sulphur vanadium copper mine, blue chalcopyrite, chalcopyrite and chalcopyrite. In addition, a small amount of vanadium and titanium oxide is found. The C is mainly derived from organic matter, and the delta 13C value is -10.9 per thousand ~-21.0 per thousand, and TS The delta 13C value of R is matched, and the Sr isotope study shows that there is a hot water rich in strontium rich in radioactive origin in the formation process; the salinity calculated according to the Sr isotope is higher than that calculated by the fluid inclusion, indicating that the salinity of the mixed water is reduced during the formation of the poisonous stone, suggesting that there may be water in the formation of the poisonous stone. The homogenization temperature of the inclusions showed that the formation temperature of the poison stone was between 118~303.7 C and TSR. In addition, the sulphide species and S isotopes in the barium metallogenic belt were consistent with the TSR. According to the C isotopes, Sr isotopes, the inclusions temperature and the barite in the metallogenic subzone of the poison heavy stone The results of S isotopic study of sulphide show that the formation of toxic rocks is related to thermo chemical sulfate reduction (TSR). The geochemical characteristics of ore bearing surrounding rock and barium ore show that the siliceous rocks are mainly formed in the anoxic environment of deep sea and semi deep sea, with the characteristics of hydrothermal and biological mixed synthesis, and the Th/U value of barium ore and surrounding rock is between 0. Between ~2, Delta U value 1, indicating that barium ore and ore bearing surrounding rock formed in anoxic environment. Mo and U, V, Cr in barium ore and surrounding rock are positive correlation, indicating that the formation environment of barium ore and surrounding rock was consistent with the reduction environment of sea water body. The ore bearing surrounding rock has a high (U+V) / (U+V+Mo) value and Mo content, suggesting the Fu. The sedimentary environment of the surrounding rock is an extremely reduced environment or even the reduction environment that may be vulcanized; the barium ore (U+V) / (U+V+Mo) in the barite metallogenic subzone is higher, and the Mo content is low, indicating that the concentration of V and U does not enrich the Mo element, suggesting that the sedimentary environment of the barite metallogenic subzone is a suboxidation reduction sedimentary environment; The barium ore (U+V) / (U+V+Mo) value of the stone metallogenic subzone is higher and the Mo content is relatively high, suggesting that the sedimentary environment of the metallogenic subzone of the poison heavy stone is extremely reducing environment, which indicates that the sedimentary environment of the toxic heavy stone metallogenic subzone is more reductive than the barite metallogenic subzone, and the Mo content in the surrounding rock is higher than the barium ore, indicating that the surrounding rock formation environment is barium. The ore is more reductive.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P619.2
[Abstract]:A rare large barium metallogenic belt in the Dabashan area of southern Qinling Mountains has been developed. The variety of barium minerals in this metallogenic belt is very rich. Through the study of the electron probe of barium deposits in the southern Qinling Mountains barium metallogenic belt and the previous research results, it is found that barium in the large barium metallogenic belt in southern Qinling Mountains is mainly barite, poisonous stone, barium Dite, barium, barium and barium. Feldspar, Hanjiang stone, Ankang ore, barium feldspar and barium vanadium feldspar exist in the form of barium vanadium mica; sulfide is mainly pyrite and sphalerite, and contains a small amount of nickel ore, sulphur vanadium copper mine, blue chalcopyrite, chalcopyrite and chalcopyrite. In addition, a small amount of vanadium and titanium oxide is found. The C is mainly derived from organic matter, and the delta 13C value is -10.9 per thousand ~-21.0 per thousand, and TS The delta 13C value of R is matched, and the Sr isotope study shows that there is a hot water rich in strontium rich in radioactive origin in the formation process; the salinity calculated according to the Sr isotope is higher than that calculated by the fluid inclusion, indicating that the salinity of the mixed water is reduced during the formation of the poisonous stone, suggesting that there may be water in the formation of the poisonous stone. The homogenization temperature of the inclusions showed that the formation temperature of the poison stone was between 118~303.7 C and TSR. In addition, the sulphide species and S isotopes in the barium metallogenic belt were consistent with the TSR. According to the C isotopes, Sr isotopes, the inclusions temperature and the barite in the metallogenic subzone of the poison heavy stone The results of S isotopic study of sulphide show that the formation of toxic rocks is related to thermo chemical sulfate reduction (TSR). The geochemical characteristics of ore bearing surrounding rock and barium ore show that the siliceous rocks are mainly formed in the anoxic environment of deep sea and semi deep sea, with the characteristics of hydrothermal and biological mixed synthesis, and the Th/U value of barium ore and surrounding rock is between 0. Between ~2, Delta U value 1, indicating that barium ore and ore bearing surrounding rock formed in anoxic environment. Mo and U, V, Cr in barium ore and surrounding rock are positive correlation, indicating that the formation environment of barium ore and surrounding rock was consistent with the reduction environment of sea water body. The ore bearing surrounding rock has a high (U+V) / (U+V+Mo) value and Mo content, suggesting the Fu. The sedimentary environment of the surrounding rock is an extremely reduced environment or even the reduction environment that may be vulcanized; the barium ore (U+V) / (U+V+Mo) in the barite metallogenic subzone is higher, and the Mo content is low, indicating that the concentration of V and U does not enrich the Mo element, suggesting that the sedimentary environment of the barite metallogenic subzone is a suboxidation reduction sedimentary environment; The barium ore (U+V) / (U+V+Mo) value of the stone metallogenic subzone is higher and the Mo content is relatively high, suggesting that the sedimentary environment of the metallogenic subzone of the poison heavy stone is extremely reducing environment, which indicates that the sedimentary environment of the toxic heavy stone metallogenic subzone is more reductive than the barite metallogenic subzone, and the Mo content in the surrounding rock is higher than the barium ore, indicating that the surrounding rock formation environment is barium. The ore is more reductive.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P619.2
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