摘要
南洞子铜(金)矿床矿化脉石英中流体包裹体均一温度介于143~265℃之间,均值为186℃;盐度介于1.4%~19.7%NaCl eq之间,均值为9.0%NaCl eq;均一温度峰值介于170~180℃之间,盐度峰值分别介于5%~7%NaCl eq和9%~11%NaCl eq之间.矿化脉石英中的1δ8OH2O介于2.17‰~6.17‰之间,均值为4.39‰;δD介于-97‰^-80‰之间,均值为-89.25‰.矿石的n(206Pb)/n(204Pb)介于18.283~18.608之间,均值为18.474;n(207Pb)/n(204Pb)介于15.704~16.000之间,均值为15.861;n(208Pb)/n(204Pb)介于38.533~39.364之间,均值为39.032.南洞子铜(金)矿床研究表明:矿床形成温度和盐度偏低;成矿流体早期主要来源于岩浆水,后期混入大气降水;成矿物质可能主要来源于上部地壳,具有富放射性成因铅的特征;沸腾作用在成矿过程中不明显,成矿可能以混合作用为主.以上研究证明南洞子铜(金)矿床类似于浅成低温热液脉状铜(金)矿床.
This paper presents a comprehensive study on the mineralizing geochemistry and the ore-forming mechanisms of the Nandongzi copper（gold） deposit in Zouping County, Shandong Province, The homogenization temperatures of primary fluid inclusions in the mineralized quartz veins of the Nandongzi copper（gold） deposit range from 143 ℃ to 265 C with an average 186℃ , while their salinities range from 1.4 % to 19.7 % NaCl eq with an average value of 9.0 % NaCl eq. Peak value of homogenization temperatures is in the range of 170-180 ℃, while peak value of salinity are in the range of 5 % -7 5 NaCl eq and 9%-11% NaCl eq. The δ^18OH2o values range from 2.17 ‰ to 6.17 ‰ with an average value of 4.39 %, while 3D values range from 97.00 % to -80.00 % with an average of-89.25 %. The values of n（^206Pb）/n（^204Pb） range from 18. 283 to 18. 608 with an average of 18. 474.n（^207Pb）/n（^204pb） ranges from 15. 704 to 16. 000 with an average of 15. 861. n（^208Pb）/n（^204pb） ranges from 38. 533 to 39. 364 with an average of 39. 032. To sum up, The study indicates that the formation temperature and salinity of the Nandongzi copper（gold） deposit are on the low side. The ore-forming fluid was mainly derived from the magmatic fluids and mixed with meteoric water in the late stage. The ore-minerals are rich in radiogenic lead isotopes which originated from lower crust. The fluid boiling is not obvious; in contrast, mixing actions plays an important part in mineralization stages. The research results proved that it should be similar to a kind of epithermal and vein filling copper（gold） deposit.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第3期392-402,共11页
Journal of Nanjing University（Natural Science）
基金
山东省资源补偿项目资助"邹平王家庄铜矿成因机制研究"
关键词
流体包裹体
稳定同位素
成矿物理化学
成因机制
南洞子铜(金)矿床
fluid inclusion, stable isotopes, metallogenic physicochemical, genetic mechanism, Nandongzi copper（gold） deposit
