湖南沃溪金锑钨矿床中成矿物质来源的硫同位素地球化学证据
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摘要
沃溪AuSbW矿床是湖南湘西前寒武纪地层中最具有代表性的金矿床之一,位于扬子准地台江南地轴南缘的雪峰弧形构造隆起带的中段。矿石以石英-金-硫化物型为主,与金共存的矿石矿物为辉锑矿、黑钨矿、白钨矿、黄铁矿等。文章对沃溪矿床深部矿段中辉锑矿和黄铁矿的硫同位素地球化学进行了研究,结果表明:黄铁矿的δ~(34)S变化范围-4. 05‰～0.42‰,极差4. 47‰,平均值-1. 54‰;辉锑矿的δ~(34)S变化范围-4. 99‰～-1. 52‰,极差3. 47‰,平均值-2. 87‰。δ~(34)S变化范围小,说明其来源的均一性,同时与赋矿的马底驿组富硫围岩的δ~(34)S很相近,表明硫来源于赋矿地层。同时,δ~(34)S具有从浅部向深部增大的趋势。
The Woxi Au-Sb-W deposit,situated in the central sector of Xuefeng arc-structural mole track located on the southern margin of Jiangnan Earth axis in Yangtze Para platform, is one of the most representative gold deposits in Precambrian stratum of western Hunan province. Ores are mainly quartz-gold-sulfide. Minerals coexisting with gold are stibnite, wolframite, scheelite and pyrite ect.. Studies on the sulfur isotope geochemistry of pyrite and stibnite in the Woxi deep mines,show that the δ~(34)S of pyrite varies from -4.05‰ to 0.42‰,range 4.47‰,with an average of -1.54‰ and that the δ~(34)S of stibnite varies from-4.99‰ to -1.52‰,range 3.47‰,with an average of -2.87‰. The centralized distribution of δ~(34)S,showing the uniformity of its source,very close to the 834 S of sulfur-rich wall rock of the Ma di yi formation, indicates that the sulfur deriveds from the stratigraphic,with δ~(34)S increaseing from shallow to deep.
The Woxi Au-Sb-W deposit,situated in the central sector of Xuefeng arc-structural mole track located on the southern margin of Jiangnan Earth axis in Yangtze Para platform, is one of the most representative gold deposits in Precambrian stratum of western Hunan province. Ores are mainly quartz-gold-sulfide. Minerals coexisting with gold are stibnite, wolframite, scheelite and pyrite ect.. Studies on the sulfur isotope geochemistry of pyrite and stibnite in the Woxi deep mines,show that the δ~(34)S of pyrite varies from -4.05‰ to 0.42‰,range 4.47‰,with an average of -1.54‰ and that the δ~(34)S of stibnite varies from-4.99‰ to -1.52‰,range 3.47‰,with an average of -2.87‰. The centralized distribution of δ~(34)S,showing the uniformity of its source,very close to the 834 S of sulfur-rich wall rock of the Ma di yi formation, indicates that the sulfur deriveds from the stratigraphic,with δ~(34)S increaseing from shallow to deep.
引文
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毛景文,李艳红.1997.江南古陆某些金矿床成因[J].地球化学,26(5):71-81.
孟宪民,谢家荣.1963.矿床分类与成矿作用[M].北京:科学出版社,1-72.
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彭渤.1992.湘西沃溪金矿田断层构造成矿机理初探[J].大地构造与成矿学,16(2):176-177.
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徐克勤.1965.矿床成因论[M].北京:地质出版社,1-320.
杨燮.1992.湖南沃溪金-锑-钨-矿床成矿物质来源及成矿元素的共生机制[J].成都地质学院学报,19(2):20-28.
杨燮.1985.湖南沃溪钨锑金矿床成因研究[D].成都:成都地质学院(硕士论文).
张理刚.1985.稳定同位素在地质科学中的应用[M].陕西:陕西科学技术出版社,1-267.
张振儒.1989.金矿研究[M].长沙:中南工业大学出版社,1-190.
鲍振襄,万容江,鲍钰敏.1999.湘西钨锑金矿床成矿系列及稳定同位素研究[J].北京地质,(1):11-17.
鲍振襄,万榕江,鲍珏敏.2001.湖南前寒武系锑金矿床成矿的独特性[J].黄金地质,2001,7(3):30-36.
陈爱清.2012.湖南沃溪Au-Sb-W矿床中白钨矿与黑钨矿的成矿规律及成因机制的研究[D].北京:中国地质大学(硕士论文).
陈梦熊.2003.湖南湘西金矿及外围石英脉包裹体特征与石英脉含金性研究[J].矿产与地质,2003,17(98):519-522.
顾雪祥,Oskar Schulz,Franz Vavtar等.2003.湖南沃溪钨-锑-金矿床的矿石组构学特征及其成因意义[J].矿床地质,22(1):107-120.
顾雪祥,刘建明,Oskar Schulz,等.2004.湖南沃溪钨锑金建造矿床同生成因的微量元素和硫同位素证据[J].地质科学,39(3):424-439.
郝立波,戚长谋.2004.地球化学原理[M].北京:地质出版社,1-120.
匡文龙,古德生,刘新华.2004.沃溪金锑钨矿床成矿地质特征及找矿前景分析[J].黄金地质,25(6):10-15.
梁金城,石锦,易诗军.1981.湘西沃溪金矿床层状石英脉的显微构造与组构探讨[J].桂林冶金地质学院学报,1(3):41-52.
刘亚军.1992.湘西沃溪金锑钨矿床褶皱构造及其控矿规律与动力成矿作用[J].矿床地质,11(2):134-141.
罗献林.1994.湖南前寒武系锑矿床的成矿地质特征[J].桂林冶金地质学院学报,14(4):335-349.
罗献林.1996.湖南省沃溪式层控金矿地质[M].北京:地震出版社,1-313.
罗献林.1984.论湘西沃溪金锑钨矿床的成因[J].桂林冶金地质学院学报,1:21-37.
毛景文,李艳红.1997.江南古陆某些金矿床成因[J].地球化学,26(5):71-81.
孟宪民,谢家荣.1963.矿床分类与成矿作用[M].北京:科学出版社,1-72.
彭渤,Adam Piestrzynski,陈广浩.2000.湘西沃溪钨锑金超纯自然金[J].大地构造与成矿学,24(1):51-56.
彭渤.1992.湘西沃溪金矿田断层构造成矿机理初探[J].大地构造与成矿学,16(2):176-177.
涂光炽,等.1984.中国层控矿床地球化学(第一卷)[M].北京:科学出版社,1-351.
吴尚全.1996.湖南元古宇层控金矿床同位素地质学特征//[C]罗献林.湖南省沃溪式层控金矿地质.北京:地震出版社,1-313.
徐克勤.1965.矿床成因论[M].北京:地质出版社,1-320.
杨燮.1992.湖南沃溪金-锑-钨-矿床成矿物质来源及成矿元素的共生机制[J].成都地质学院学报,19(2):20-28.
杨燮.1985.湖南沃溪钨锑金矿床成因研究[D].成都:成都地质学院(硕士论文).
张理刚.1985.稳定同位素在地质科学中的应用[M].陕西:陕西科学技术出版社,1-267.
张振儒.1989.金矿研究[M].长沙:中南工业大学出版社,1-190.