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首页> 美国卫生研究院文献>Springer Open Choice >Experimental partitioning of halogens and other trace elements between olivine pyroxenes amphibole and aqueous fluid at 2 GPa and 900–1300 °C
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Experimental partitioning of halogens and other trace elements between olivine pyroxenes amphibole and aqueous fluid at 2 GPa and 900–1300 °C

机译：在2 GPa和900–1300°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 2 GPa 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 20 ppm and up to 900 ppm F in olivine, making olivine an important repository of halogens in the mantle. Chlorine is always incompatible with Cl partition coefficients DClolivine/fluid varying between 10−5 and 10−3, whereas DClorthopyroxene/fluid and DClclinopyroxene/fluid are ~10−4 and DClamphibole/fluid is ~5 × 10−3. Furthermore, partitioning results for incompatible trace element show that compatibilities of trace elements are generally ordered as Damph/fluid ≈ Dcpx/fluid > Dopx/fluid > Dol/fluid but that Dmineral/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 ~3,570 cm−1. In F ± TiO2-bearing systems, additional absorption bands appear at ~3,535, ~3,595, 3,640 and 3,670 cm−1. Absorption bands at ~3,530 and ~3,570 cm−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.Electronic supplementary materialThe online version of this article (doi:10.1007/s00410-013-0902-5) contains supplementary material, which is available to authorized users.
机译：我们在900和1,300°C的2 GPa的天然和合成系统中进行了一系列高压实验，给出了橄榄石，辉石，闪石和共存的含氯水性流体中各种Cl的新分配系数。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20 ppm，橄榄石中的F高达900 ppm，这使得橄榄石成为地幔中卤素的重要储存库。氯与Cl分配系数DCl 橄榄/流体始终不兼容，在10 -5 和10 -3 之间变化，而DCl 流体和DCl 斜py基/流体约为10 −4 ，DCl 苯二酚/流体约为〜5×10 − 3 。此外，不相容的痕量元素的划分结果表明，痕量元素的相容性通常按D amph / fluid ≈D cpx / fluid opx / fluid < / sup D ol / fluid ，但对于所有观察到的硅酸盐相来说，Li和P的D 矿物/流体非常相似。在无F的含钛系统中合成的橄榄石的红外光谱显示在3,525和〜3,570 cm -1 处的吸收带。在含F±TiO2的系统中，附加的吸收带出现在〜3,535，〜3,595、3,640和3,670 cm -1 。先前分配给类似腐铁矿状点缺陷的吸收带位于〜3,530和〜3,570 cm -1 ，得益于低合成温度和F的存在。TEM无法证明存在平面缺陷研究，但观察到橄榄石晶格中的位错，并被认为是橄榄石中卤素掺入的重要部位。电子补充材料本文的在线版本（doi：10.1007 / s00410-013-0902-5）包含补充材料，其中适用于授权用户。

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