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机构地区:[1]中国科学院地球化学研究所广州分部,广州五山510640 [2]日本国东京大学理学部化学系
出 处:《岩石学报》1993年第1期9-19,共11页Acta Petrologica Sinica
摘 要:微量元素和同位素地球比学资料表明黄椅山玄武岩的地幔源区的同位素组成与原始地幔近似;巨晶矿物与寄主岩有成因关系;鉴于熔岩快速结晶,固相与液相难以达到化学平衡,故利用巨晶-熔体来计算分配系数更为合理;碱性玄武岩的双凹型REE配分模式是熔体与单斜辉石、石榴石达到化学平衡或近于化学平衡的结果;出现的Eu正异常应为REE配分模式中两条双凹曲线的交点,与地幔的氧逸度无关。All of the rare element and isotope characteristics of the Huangyishan basalts are similar to that of the original mantle of the Earth. Since the lava crystallization was too quick to reach the chemical equilibrium between the solid and liquid phases, it is reasonable using the rare element compositions of the megacrysts and the melts to calculate the rare element distribution coefficients of the silicates crystal and melt since there are genesis relations between the megacryst and its host rock basalts. The double-concave shape of REE patterns of the alkali basalt show that the basalt melt had reached equilibrium or quasi-equilibrium with the garnet and clinopyroxene megacrysts. The positive Eu anomaly of the basalts is actually the turning point of the double-curved REE patterns but with no relations with oxygen fugacity of the mantle.
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