| 广东大宝山多金属矿床成矿物质来源同位素证据 |
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| 引用本文：徐文炘,李蘅,陈民扬,黄德鑫,张富铁,汪礼明.2008.广东大宝山多金属矿床成矿物质来源同位素证据[J].地球学报,29(6):684-690. |
| DOI：10.3975/cagsb.2008.06.04 |
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| 基金项目:国家科技支撑计划项目(编号:2006BAB01B00) |
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| 中文摘要:笔者对大宝山多金属矿床矿石和脉石矿物进行铅、硫、氢和氧同位素组成测定,获得硫化物的206Pb/204Pb值为17.930～18.785;207Pb/204Pb值为15.491～15.772;208Pb/204Pb值为37.990～40.990,并组成良好的线性关系。泥盆系地层中黄铁矿的δ34S为-22.5‰～+17.9‰,矿床硫化物的δ34S为-2.4‰～+4.6‰。黄铁矿、闪锌矿和方铅矿共生矿物对,具有δ34Spy>δ34Ssp>δ34Sgn,用磁黄铁矿的硫同位素组成估算出δ34S∑S为2‰±3‰。硫化物包裹体的氢同位素在-101‰～-123‰之间,与硫化物共生石英的氧同位素为+9.3‰～+17.9‰,换算成水的氧同位素为+0.3‰～+3.9‰,表明成矿热液来源较为复杂。 |
| 中文关键词:同位素 多金属矿 大宝山 广东 |
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| Isotope Evidence of Material Sources of the Dabaoshan Polymetallic Deposit |
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| Abstract:According to S,Pb,H and O isotopic composition analyses of ores and gangue minerals in the Dabaoshan polymetallic deposit,the 206Pb/204Pb ratio varies from 17.930 to 21.480,207Pb/204Pb ratio from 15.491 to 16.215,and the 208Pb/204Pb ratio from 56.390 to 37.990,forming a good linear relationship. The δ34S value of pyrite in Devonian strata ranges from-22.5‰ to +17.9‰,whereas the δ34S value of the sulfide deposits from -2.4‰ to +4.6‰.The association of pyrite,sphalerite and galena is characterized by δ34Spy>δ34Ssp>δ34Sgn, and the δ34SΣS(0±3‰) is estimated from the sulfur isotopic composition of pyrrhotine. The hydrogen isotope value of sulfude inclusions varies from -101‰ to -123‰, and the oxygen isotope value of quartz associated with sulfide is +9.3‰～+17.9‰. If it is converted into the oxygen isotope of water, the value ranges from +0.3‰ to +3.9‰, suggesting that the sources of the ore - forming hydrothermal fluids were rather complex. |
| keywords:isotopic polymetallic deposit Dabaoshan Guangdong |
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