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地球学报  2008 

广东大宝山多金属矿床成矿物质来源同位素证据

DOI: 10.3975/cagsb.2008.06.04

Keywords: 同位素,多金属矿,大宝山,广东

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Abstract:

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。

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