【摘要】：湖南花垣鉛鋅礦床位于揚(yáng)子地臺東南緣,是湘西—黔東地區(qū)最典型的超大型鉛鋅礦床,已探明鉛鋅儲量超過500×10~4t,其預(yù)測資源量逾1800×104t。報道了該礦床主要礦石硫化物的S、)Pb同位素研究成果,結(jié)合前人的Sr同位素數(shù)據(jù),分析了礦床的成礦物質(zhì)來源,并探討了成礦機(jī)制。硫化物的δ~(34)S值變化范圍較小,為24.5‰~34.7‰,平均值為30.2‰,硫來源于各時代碳酸鹽地層中硫酸鹽熱化學(xué)還原作用(TSR),有機(jī)質(zhì)在還原反應(yīng)過程中發(fā)揮了重要作用;硫化物的~(206))Pb/~(204))Pb、~(207)Pb/~(204)Pb、~(208)Pb/~(204)Pb值分別為18.139~18.678、15.691~15.832、38.300~39.255,變化范圍較小,具有上地殼來源的特點(diǎn),賦礦地層下部具有高)Pb-Zn含量的地層為成礦提供了大量的金屬物質(zhì);閃鋅礦的~(87)Sr/~(86)Sr值變化范圍為0.70915~0.70996,高于賦礦地層清虛洞組灰?guī)r的Sr同位素比值(0.70885~0.70909),表明成礦流體可能流經(jīng)圍巖及基底地層,從而引起Sr同位素比值因混染作用而升高;礦石礦物的沉淀機(jī)制為2種流體的混合,即含金屬物質(zhì)的成礦溶液與富含有機(jī)質(zhì)、硫酸鹽的熱水溶液在合適的部位匯合,并發(fā)生反應(yīng)。
[Abstract]:Huayuan lead-zinc deposit in Hunan Province, located in the southeast margin of Yangtze platform, is the most typical super-large-scale Pb-Zn deposit in western Hunan and eastern Guizhou. It has been proved that the reserves of lead and zinc exceed 500 脳 10 ~ 4 t, and its predicted resource amount exceeds 1800 脳 10 ~ 4 t. This paper reports the research results of S,) Pb isotopes of the main ore sulphides in this deposit. Combining with the Sr isotopic data of predecessors, the ore-forming material sources of the ore deposits are analyzed, and the ore-forming mechanism is discussed. The 未 ~ (34) S values of sulphide vary little, ranging from 24.5 鈥，

本文編號：2453960