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在0.61 GPa和1.0 GPa条件下,进行了地幔二辉橄榄岩的部分熔融实验,首次探讨了熔体成分在“不同熔融阶段”随部分熔融程度的变化。结果显示,熔体中SiO_2、CaO、Al_2O_3、Na_2O和TiO_2变化趋势在不同熔融阶段不一样。熔体成分在低压下或较高压下相对富SiO_2。幔源富硅酸盐流体(熔体)的成因有多种,但存在于同一地幔橄榄岩捕虏体中、挥发分及碱质含量相近而其他成分不同的基性—中酸性富硅酸盐熔体,是在有地幔C—O—H流体介入或其他交代矿物存在时的原位局部平衡
Under the condition of 0.61 GPa and 1.0 GPa, the partial melting experiments of the mantle of marls were carried out, and the changes of the melt composition with partial melting at “different melting stages” were discussed for the first time. The results show that the variation trend of SiO_2, CaO, Al_2O_3, Na_2O and TiO_2 in melt is different at different melting stages. The melt composition is relatively rich in SiO 2 at low or higher pressures. There are many reasons for the formation of mantle-derived silicate fluid (melt), but exist in the same mantle peridotite xenoliths. The basic-intermediate acid-rich silicates with similar volatiles and alkalis contents and other compositions The melt is in situ local equilibrium when a mantle C-O-H fluid intervenes or otherwise accounts for the presence of minerals