The Laodonggou gold polymetallic deposit is one of the most typical gold Mineral of the Beishan metallo-genic belt in Inner Mongolia.There are many disputes about its genesis,and the research on the source of ore-forming materials in the deposit is almost blank.Based on the on-situ investigation of the deposit,this work se-lected typical ore samples from different middle sections underground and conducted in-situ S-Pb and C-O iso-tope studies.The δ34S of Laodonggou gold polymetallic deposit ranges from-0.56‰ to 5.54‰,the 206Pb/204Pb ranges from 18.326 to 18.390,the 207Pb/204Pb ranges from 15.563 to 15.645,the 208Pb/204Pb ranges from 38.226 to 38.390,the μ of lead isotopes ranges from 9.40 to 9.55,the ω ranges from 35.77 to 36.85,the S-K Ⅱ model age of galena is 232～270 Ma,and the δ13C ranges from-0.04‰ to 2.93‰.These show that the ore-forming materials of the Laodonggou gold polymetallic deposit have a mixed source of magma and strata,and the ore-forming fluid is mainly derived from magma.In the late stage of mineralization,metamorphic water from strata was mixed into the fluid.Based on the study of stable isotopes of ore deposits,combined with previous studies on the tectonic evolution of the Beishan orogenic belt,it is first proposed that the genesis of the Laodonggou gold polymetallic deposit is magmatic hydrothermal type.
关键词
原位S-Pb同位素/C-O同位素/成矿物质来源/老硐沟金多金属矿床/北山成矿带
Key words
In-situ sulfur-lead isotope/carbon oxygen isotope/source of ore-forming materials/Laodong-gou gold polymetallic deposit/Beishan metallogenic belt
维普
万方数据