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地球学报  2008 

广西高龙微细浸染型金矿床同位素地球化学研究

DOI: 10.3975/cagsb.2008.06.06

Keywords: 同位素,微细浸染型金矿,广西高龙

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Abstract:

对广西高龙微细浸染型金矿床矿石和脉石矿物进行硫、铅、氢、氧同位素测定,获得沉积岩中黄铁矿的δ34S为-15.3‰~+13.6‰,含矿层中的黄铁矿δ34S值为+0.4‰~+15.6‰,硅质岩中黄铁矿的δ34S为+1.7‰~+9.7‰,硅质岩中辉锑矿的δ34S值为-15.3‰~+0.1‰.从含矿层到硅质岩的黄铁矿,再到硅质岩的辉锑矿,硫同位素组成有降低趋势.黄铁矿的206Pb/204Pb值为8.270~18.470;207Pb/204Pb值为5.620~15.710;208Pb/204Pb值为8.310~38.740.矿床石英的氧同位素为+11.3‰~+23.9‰,水的氧同位素为-4.2‰~+14.4‰,矿物包裹体的氢同位素为-53.4‰~-77.1‰,方解石的氧同位素为+10.5‰~+18.6‰,换算成水中氧同位素为-3.2‰~+10.7‰,氢同位素为-54.5‰~-30.5‰,表明热液可能来源于岩浆热液与大气降水和海水混合.

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