CAJ | 학술논문

本文对用研磨法和分步溶解技术提取流体相和硫化物相的实验条件进行了系统的研究,在此基础上建立和完善了闪锌矿分相Rb-Sr等时线定年的方法流程。通过对湘西打狗洞铅锌矿床Rb-Sr定年的示范研究,进一步验证了方法的有效性和应用前景,获得闪锌矿矿物Rb-Sr等时线年龄（473±76 Ma）,采用研磨法和分步溶解技术获得更精确的闪锌矿流体相＋硫化物相年龄（489.6±5.9 Ma）和全矿物＋矿物相（流体相＋硫化物相）的年龄（490±6.5 Ma）,表明湘西打狗洞铅锌矿床的成矿作用发生在早奥陶世,其成矿作用的发生可能与晚期成岩或区域构造热事件有关。
본문대용연마법화분보용해기술제취류체상화류화물상적실험조건진행료계통적연구,재차기출상건립화완선료섬자광분상Rb-Sr등시선정년적방법류정。통과대상서타구동연자광상Rb-Sr정년적시범연구,진일보험증료방법적유효성화응용전경,획득섬자광광물Rb-Sr등시선년령（473±76 Ma）,채용연마법화분보용해기술획득경정학적섬자광류체상＋류화물상년령（489.6±5.9 Ma）화전광물＋광물상（류체상＋류화물상）적년령（490±6.5 Ma）,표명상서타구동연자광상적성광작용발생재조오도세,기성광작용적발생가능여만기성암혹구역구조열사건유관。
This paper takes a systematic study on the experimental conditions using the grinding method and stepping dissolution technique to extract the fluid phase and sulfide phase from sphalerite for Rb-Sr isochrone dating,and the entire analysis process was established and improved.Through the demonstration of Rb-Sr dating method used in Dagoudong Pb-Zn deposits,western Hunan,the validity of the method was further verified and showed a good application prospects.Three isochron ages are obtained：473±76 Ma for sphalerite mineral-phase,489.6±5.9 Ma for fluid phase ＋sulfide phase of sphalerite by grinding method and stepping dissolution technique,490±6.5 Ma for mineral-phase and fluid phase ＋sulfide phase of sphalerite.The isochron ages indicated that Dagoudong deposit was formed in Early Ordovician,and maybe related to later diagenesis or regional tectono-thermal events.