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首页> 外文期刊>Contributions to Mineralogy and Petrology >The effect of fluorine on clinopyroxene/melt trace-element partitioning
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The effect of fluorine on clinopyroxene/melt trace-element partitioning

机译：氟对临床/熔体微量元素分配的影响

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The impact of fluorine on phase relations and clinopyroxene-melt element partitioning has been explored experimentally to better understand the effect of this halogen on the residual enrichment of the REE and HFSE during crystallisation of alkaline and peralkaline magmas. Clinopyroxene was grown from three H2O-saturated synthetic glasses of tephriphonolite-to-phonolite composition in a rapid quench internally heated pressure vessel at 650-800 circle C and 200 MPa, with Delta log fO(2) fixed to ca. FMQ + 1. The fluorine content in the charges was varied and produced quenched melts from fluorine-free to 1.6 wt.% F. The experiments yield an assemblage of melt, fluid, sodic clinopyroxene, biotite, magnetite, +/- K-feldspar, +/- titanite, +/- fluorite, and +/- hiortdahlite (a Na-Ca-Ti-F sorosilicate). Addition of fluorine markedly increases the mode of biotite without significantly affecting the mode of clinopyroxene. Relative to fluorine-free compositions, experiments with 1.6 wt.% fluorine in the melt show a strong decrease in clinopyroxene-melt partition coefficients for the trivalent REE La-Dy and Y with a lesser decrease for the DHREE and DHFSE4+. The diminished uptake of these metals by clinopyroxene may reflect changes to their speciation in the melt phase, consistent with the formation of REE-F complexes and with modifications to the medium-range structural environment around HFSE4+ An increase in the fluorine content of the melt will thus make the REE and HFSE4+ progressively less compatible and, therefore, available for residual enrichment.
机译：通过实验探讨了氟对相相关系和临床融合元件分区的影响，以更好地了解该卤素在碱性和乳碱岩浆结晶过程中对REE和HFSE的残留富集的影响。在650-800圆C和200MPa的快速淬火内加热的压力容器中从三个H 2饱和合成玻璃中生长过三个H 2饱和合成玻璃，在650-800圆形C和200MPa中，用达达对准到CA. FMQ + 1。电荷中的氟含量变化并产生淬火熔融从无氟至1.6重量％。％F.实验产生熔体，液体，碳酸钠，+/- K-长石的组合物，+/-二钛矿，+/-萤石和+/- Hiortdahlite（Na-Ca-Ti-F sorosiLate）。加入氟显着增加了生物烟石的模式，而不会显着影响临床模式。相对于无氟组合物，熔体中的1.6重量％的实验。熔体中的％氟显示出三价Ree La-Dy和Dhree和DHFSe4 +的较小减少的临床融化分配系数的强烈降低。通过Closopococexene减少这些金属的摄取可能反映其在熔体相中的形态的变化，与REE-F复合物的形成一致，并随着HFSe4周围的中范围结构环境的修饰+熔体的氟含量的增加因此，使REE和HFSE4 +逐渐减少兼容，因此可用于残留富集。

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