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首页> 外文期刊>Contributions to Mineralogy and Petrology >Experimental partitioning of halogens and other trace elements between olivine, pyroxenes, amphibole and aqueous fluid at 2 GPa and 900–1,300 °C
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Experimental partitioning of halogens and other trace elements between olivine, pyroxenes, amphibole and aqueous fluid at 2 GPa and 900–1,300 °C

机译：在2 GPa和900–1,300°C的温度下，在橄榄石，辉石，闪石和含水流体之间进行卤素和其他微量元素的实验分配

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摘要

We present new partition coefficients for various trace elements including Cl between olivine, pyroxenes, amphibole and coexisting chlorine-bearing aqueous fluid in a series of high-pressure experiments at 2GPa between 900 and 1,300°C in natural and synthetic systems. Diamond aggregates were added to the experimental capsule set-up in order to separate the fluid from the solid residue and enable in situ analysis of the quenched solute by LA–ICP–MS. The chlorine and fluorine contents in mantle minerals were measured by electron microprobe, and the nature of OH defects was investigated by infrared spectroscopy. Furthermore, a fluorine-rich olivine from one selected sample was investigated by TEM. Results reveal average Cl concentrations in olivine and pyroxenes around 20ppm and up to 900ppm F in olivine, making olivine an important repository of halogens in the mantle. Chlorine is always incompatible with Cl partition coefficients D Cl olivine/fluid varying between 10−5 and 10−3, whereas D Cl orthopyroxene/fluid and D Cl clinopyroxene/fluid are ~10−4 and D Cl amphibole/fluid is ~5×10−3. Furthermore, partitioning results for incompatible trace element show that compatibilities of trace elements are generally ordered as D amph/fluid≈D cpx/fluid>D opx/fluid>D ol/fluid but that D mineral/fluid for Li and P is very similar for all observed silicate phases. Infrared spectra of olivine synthesized in a F-free Ti-bearing system show absorption bands at 3,525 and ~3,570cm−1. In F±TiO2-bearing systems, additional absorption bands appear at ~3,535, ~3,595, 3,640 and 3,670cm−1. Absorption bands at ~3,530 and ~3,570cm−1, previously assigned to humite-like point defects, profit from low synthesis temperatures and the presence of F. The presence of planar defects could not be proved by TEM investigations, but dislocations in the olivine lattice were observed and are suggested to be an important site for halogen incorporation in olivine.
机译：在自然和合成系统中，在900和1,300°C之间的2GPa压力下进行的一系列高压实验中，我们给出了各种微量元素的新分配系数，包括橄榄石，辉石，闪石和共存的含氯水性流体之间的Cl。将金刚石聚集体添加到实验性胶囊设置中，以便将液体与固体残留物分离，并通过LA-ICP-MS对淬灭的溶质进行原位分析。通过电子探针测量地幔矿物中的氯和氟含量，并通过红外光谱研究OH缺陷的性质。此外，通过TEM研究了来自一个选定样品的富氟橄榄石。结果显示，橄榄石和辉石中的平均Cl浓度约为20ppm，橄榄石中的F高达900ppm，这使得橄榄石成为地幔中卤素的重要储存库。氯总是与Cl分配系数D Cl橄榄石/流体在10-5和10-3之间变化不兼容，而D Cl邻苯二酚/流体和D Cl斜py烯/流体为〜10-4和D Cl闪石/流体为〜5× 10-3。此外，不相容痕量元素的划分结果表明，痕量元素的相容性通常按以下顺序排列：D amph /流体≈Dcpx /流体> D opx /流体> D ol /流体，但Li和P的D矿物/流体非常相似对于所有观察到的硅酸盐相。在不含F的含钛系统中合成的橄榄石的红外光谱显示在3,525和〜3,570cm-1处的吸收带。在含F±TiO2的系统中，附加吸收带出现在〜3,535，〜3,595、3,640和3,670cm-1处。以前分配给像腐铁矿状的点缺陷的〜3,530和〜3,570cm-1处的吸收带，得益于低合成温度和F的存在。平面缺陷的存在无法通过TEM研究证明，但橄榄石中的位错观察到晶格，并被认为是橄榄石中卤素掺入的重要部位。

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