橄榄石水溶性与含铁量相关性的实验研究

Experimental investigation on water solubility in olivine single crystals with different Fe content.

本文首次报导了含铁量不同的橄榄石单晶在不同温压条件下水溶性的试验研究结果。橄榄石单晶试件在 30 0 MPa静水压和 10 0 0℃至 130 0℃的温度条件下进行热压 ,每隔 5 0℃进行一组试验 ,氧逸度被控制在 Ni/ Ni O水平上。对热压后试件的抛光无包裹体区域做了显微红外光谱分析 ,红外光束平行于试件的 [0 10 ]方向 ,最小直径为 15～ 2 5 μm。分析结果表明 ,在实验温压范围内 ,橄榄石中的水含量随铁含量的增加而增加。对于同样铁含量的橄榄石 ,则随温度的增加 ,橄榄石的水含量也增加。最后 。

This paper reports the experimental results of water solubility in San Carlos olivine single crystals with different iron content hydrothermally annealed under a pressure of 300MPa and at a temperature from 1000 degreesC to 1300 degreesC with 50 degreesC increments with oxygen fugacity controlled by the Ni/NiO buffer. The water content was analyzed using infrared spectra in [010] direction of polished samples in crack-free and inclusion-free regions about 15 to 25 mum in diameter. From the FTIR analysis, it is observed that water content increases with iron content as well as temperature under the experimental condition we used. The implication of the test result to the dynamic process in earth mantle is discussed briefly as well.