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在水压100 MPa,温度500~800℃和富18O水的热液条件下,开展了黑钨矿氧扩散动力学的实验研究。并由离子探针质谱测定平行于c轴和垂直于c轴的黑钨矿氧同位素扩散剖面。经实验研究获得了黑钨矿氧扩散的Arren ius关系。黑钨矿平行于c轴氧扩散的指数前因子D0为1.15×10-6cm2/s,扩散活化能Q为171.4±7.4 kJ/mol;垂直于c轴的氧扩散的指数前因子D0为8.51×10-7cm2/s,扩散活化能Q为170.8±7.8 kJ/mol。黑钨矿的氧扩散无明显方向性。黑钨矿的氧扩散交换封闭温度低于透辉石、角闪石和金红石,高于钙长石,与磁铁矿十分接近。
Under hydrothermal conditions of water pressure 100 MPa, temperature 500 ~ 800 ℃ and water rich 18O, the oxygen diffusion kinetics of wolframite ore was studied. The oxygen isotope diffusion profile of wolframite parallel to the c-axis and perpendicular to the c-axis was determined by ion-probe mass spectrometry. Arren ius relationship of oxygen diffusion of wolframite was obtained through experimental study. The exponential factor D0 of wolframite oxygen diffusion parallel to the c axis is 1.15 × 10-6cm2 / s, the activation energy Q of diffusion is 171.4 ± 7.4kJ / mol; the exponential factor D0 of oxygen diffusion perpendicular to the c axis is 8.51 × 10-7cm2 / s, the diffusion activation energy Q is 170.8 ± 7.8kJ / mol. Wollastonite oxygen diffusion no obvious directionality. Wollastonite oxygen diffusion exchange sealing temperature lower than diopside, amphibole and rutile, higher than the calcium feldspar, and the magnetite is very close.