An experimental study on the influence of fluorine and chlorine on phase relations in peralkaline phonolitic melts
An experimental study on the influence of fluorine and chlorine on phase relations in peralkaline phonolitic melts
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氟和氯对全碱性酚醛熔体相关系影响的实验研究
DOI：
10.1007/s00410-014-0977-7
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发表时间：
2014
影响因子：
3.5
通讯作者：
Nowak M
中科院分区：
文献类型：
--
作者：
Giehl C;Marks MAW;Nowak M
氟和氯影响岩浆岩的相稳定性。我们提供了相平衡实验，研究了F和Cl含量不同的过碱性和富铁的声橄榄石组分。起始成分代表一种脉岩，它可能是过碱性伊利毛萨克深成杂岩(南格陵兰岛)的母体熔体。实验在100℃，1,000-650℃，低氧逸度下进行，用内衬石墨的金胶囊在内部加热的氩压力容器和快速淬火冷密封压力容器中调节。为了覆盖这个大的T间隔，我们应用了两步分步结晶策略，其中合成了代表800℃下残余熔体成分的玻璃作为在低温度下连续实验的起始材料。在这些实验中，氧化起始玻璃通过还原铁铁来分配氧气，并在最初干燥的实验中通过与压力介质(H2O)提供的氢反应生成高达1.2wt%的溶解OH。对于OH的测定，在Au胶囊中进行了水合超液相线实验，用红外光谱校准了基本OH伸缩振动的消光系数(ε3,415=9.48±3.3mol−1 cm−1)。实验中观察到的矿物相有钛磁铁矿、铁闪石橄榄石、单斜辉石、无辉闪锌矿(Na2Fe5TiSi6O20)、碱性长石和霞石(±自然铁)，并与残余熔体共存。当熔体浓度超过1.5wt%时，萤石(CaF2)和辉石(Ca6Zr2Si4O16F4)稳定，有利于富钙单斜辉石的形成。方钠铝石(Na8Al6Si6O24Cl2)和透析液(Na15Ca6Fe3Zr3Si26O73(OH)3Cl2)在0.2-0.5wt%(取决于t)的ClMelt浓度和0.7wt%的ZrO2熔体浓度下形成，以稳定真透析液和透析液。因此，氟和氯在这样的体系中可能变得相容，并有可能影响演化岩浆中的氟/氯熔体比。
Fluorine and chlorine affect phase stabilities in magmatic rocks. We present phase equilibrium experiments investigating a peralkaline and iron-rich phonolitic composition with variable F and Cl contents. The starting composition represents a dyke rock, which is a possible parental melt to the peralkaline Ilímaussaq plutonic complex (South Greenland). Experiments were performed at 100 MPa, 1,000–650 °C and low oxygen fugacity adjusted with graphite-lined gold capsules in an internally heated argon pressure vessel and rapid quench cold seal pressure vessels. To cover this largeTinterval, we applied a two-step fractional crystallization strategy where glasses representing residual melt compositions at 800 °C were synthesized as starting material for consecutive experiments at lowerT. In these experiments, oxidized starting glasses allocate oxygen by reduction of ferric iron and up to 1.2 wt% dissolved OH form through reaction with hydrogen provided by the pressure medium (H2O) in initially dry experiments. For OH determination, hydrated super-liquidus experiments in Au capsules were performed to calibrate the extinction coefficient for the fundamental OH stretching vibration using infrared spectroscopy (ε3,415= 48 ± 3 L mol−1cm−1). Observed mineral phases in our experiments are titanomagnetite, fayalitic olivine, clinopyroxene, aenigmatite (Na2Fe5TiSi6O20), alkali feldspar and nepheline (±native iron) coexisting with residual melt. Above 1.5 wt% Fmeltconcentrations, fluorite (CaF2) and hiortdahlite (Ca6Zr2Si4O16F4) are stable in favor of Ca-rich clinopyroxene. Sodalite (Na8Al6Si6O24Cl2) and eudialyte (Na15Ca6Fe3Zr3Si26O73(OH)3Cl2) form at Clmeltconcentrations of 0.2–0.5 wt% (depending onT) and ZrO2 meltconcentrations >0.7 wt% are additionally needed to stabilize eudialyte and hiortdahlite. Therefore, F and Cl may become compatible in such systems and have the potential to influence F/Cl melt ratios in evolving magmas.
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发表时间：
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