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首页> 外文期刊>Contributions to Mineralogy and Petrology >Experiments on silicate melt immiscibility in the system Fe_2SiO_4-KAlSi_3O_8-SiO_2-CaO-MgO-TiO_2-P_2O_5 and implications for natural magmas
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Experiments on silicate melt immiscibility in the system Fe_2SiO_4-KAlSi_3O_8-SiO_2-CaO-MgO-TiO_2-P_2O_5 and implications for natural magmas

机译：Fe_2SiO_4-KAlSi_3O_8-SiO_2-CaO-MgO-TiO_2-P_2O_5体系中硅酸盐熔体不混溶性的实验及其对天然岩浆的影响

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The effect of CaO and MgO, with or without TiO_2 and P_2O_5, on the two-melt field in the simplified system Fe_2SiO_4-KAlSi_3O_8-SiO_2 has been experimentally determined at l,050 deg -l,240 deg C, 400 MPa. Despite the suppressing effect of MgO, CaO, and pressure on silicate melt immiscibility, our experiments show that this process is still viable at mid-crustal pressures when small amounts (0.6-2.0 wt percent) of P_2O_5 and TiO_2 are present. Our data stress that the major element partition coefficients between the two melts are highly correlated with the degree of polymerisation (nbo/t) of the SiO_2-rich melt, whatever temperature, pressure, or exact composition. Experimental immiscible melt compositions in natural systems at 0.1 MPa from the literature (lunar and tholeiitic basalts) plot on similar but distinct curves compared to the simplified system. These relations between melt polymerisation and partition coefficients, which hold for a large range of compositions and fO_2, are extended to various volcanic and plutonic rocks. This analysis strengthens the proposal that silicate melt immiscibility can be important in volcanic rocks of various compositions (from tholeiitic basalts to lam-prophyres). However, the majority of proposed immiscible compositions in plutonic rocks are at least not coexisting melts, but may have suffered accumulation of early crystallized minerals.
机译：已经通过实验确定了在1,050摄氏度-l，240摄氏度，400 MPa条件下，CaO和MgO在有或没有TiO_2和P_2O_5的情况下对简化系统Fe_2SiO_4-KAlSi_3O_8-SiO_2的两熔场的影响。尽管有MgO，CaO和压力对硅酸盐熔体不溶混性有抑制作用，但我们的实验表明，当存在少量（0.6-2.0 wt％）的P_2O_5和TiO_2时，该方法在中地壳压力下仍然可行。我们的数据强调，无论温度，压力或确切组成如何，两种熔体之间的主要元素分配系数与富含SiO_2的熔体的聚合度（nbo / t）高度相关。与简化系统相比，来自文献（月球和生辉玄武岩）在0.1 MPa压力下，天然系统中的实验性不混溶熔体成分绘制在相似但不同的曲线上。熔体聚合与分配系数之间的关系（适用于广泛的组成和fO_2）被扩展到各种火山岩和深成岩。这种分析强化了这样的建议，即硅酸盐熔体的不溶混性在各种成分的火山岩中（从生辉玄武岩到兰-卟啉岩）很重要。但是，在提议的深成岩中，大多数提议的不混溶成分至少不是共存的熔体，但可能遭受了早期结晶矿物的积累。

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