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在热力学计算的基础上,依据硫化物中矿物组合和热液流体化学组成绘制东太平洋海隆13°N附近热液Fe-S-H2O系统布拜图(Peurbax diagram),阐明了实际情况下东太平洋海隆13°N附近热液流体由高温至低温的过程中,硫化物中优势矿物黄铁矿的稳定场的演化。结合已有的动力学实验和硫同位素分馏的研究成果,揭示了沉淀硫化物的热液活动过程中形成优势矿物黄铁矿的可能的主要化学反应历程。在东太平洋海隆13°N附近海底热液系统中,热液流体由高温(T>200℃)演化至低温(25~200℃)过程中黄铁矿的形成机制发生了明显的改变。
Based on the thermodynamic calculation, the Peurbax diagram of hydrothermal Fe-S-H2O system near the 13 ° N seams in the eastern Pacific Rim was drawn based on the mineral assemblages and chemical compositions of hydrothermal fluids in the sulphides. It is clarified that under the actual conditions, the East Pacific Evolution of the stable field of pyrite, the dominant mineral in sulphide, during the hydrothermal fluid from high to low temperatures near 13 ° N in the seamounts. Combined with the existing kinetic experiments and the research results of sulfur isotope fractionation, the possible main chemical reaction course of formation of the dominant mineral pyrite during the hydrothermal activity of precipitated sulfides is revealed. In the seabed hydrothermal system near the 13 ° N seamounts in the East Pacific Rift, the formation mechanism of pyrite changed significantly from high temperature (T> 200 ℃) to low temperature (25 ~ 200 ℃).