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首页> 外文期刊>Chemical geology >Pyroxene standards for SIMS oxygen isotope analysis and their application to Merapi volcano, Sunda arc, Indonesia
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Pyroxene standards for SIMS oxygen isotope analysis and their application to Merapi volcano, Sunda arc, Indonesia

机译：SIMS氧同位素分析的标准品及其在印度尼西亚Sun他弧Merapi火山中的应用

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Measurement of oxygen isotope ratios in common silicate minerals such as olivine, pyroxene, feldspar, garnet, and quartz is increasingly performed by Secondary Ion Mass Spectrometry (SIMS). However, certain mineral groups exhibit solid solution series, and the large compositional spectrum of these mineral phases will result in matrix effects during SIMS analysis. These matrix effects must be corrected through repeated analysis of compositionally similar standards to ensure accurate results. In order to widen the current applicability of SIMS to solid solution mineral groups in common igneous rocks, we performed SIMS homogeneity tests on new augite (NRM-AG-1) and enstatite (NRM-EN-2) reference materials sourced from Stromboli, Italy and Webster, North Carolina, respectively. Aliquots of the standard minerals were analysed by laser fluorination (LF) to establish their delta O-18 values. Repeated SIMS measurements were then performed on randomly oriented fragments of the same pyroxene crystals, which yielded a range in delta O-18 less than +/- 0.42 and +/- 0.58 parts per thousand (2 sigma) for NRM-AG-1 and NRM-EN-2, respectively. Homogeneity tests verified that NRM-AG-1 and NRM-EN-2 do not show any crystallographic orientation bias and that they are sufficiently homogeneous on the 20 mu m scale to be used as routine mineral standards for SIMS delta O-18 analysis. We subsequently tested our new standard materials on recently erupted pyroxene crystals from Merapi volcano, Indonesia. The delta O-18 values for Merapi pyroxene obtained by SIMS (n = 204) agree within error with the LF-derived delta O-18 values for Merapi pyroxene but differ from bulk mineral and whole-rock data obtained by conventional fluorination. The bulk samples are offset to higher delta O-18 values as a result of incorporation of mineral and glass inclusions that in part reflects crustal contamination processes. The Merapi pyroxene SIMS data, in turn, display a frequency peak at 5.8 parts per thousand, which allows us to estimate the delta O-18 value of the primary mafic magma at Merapi to similar to 6.1 parts per thousand when assuming closed system differentiation. (C) 2016 Elsevier B.V. All rights reserved.
机译：二次离子质谱法（SIMS）越来越多地测量常见的硅酸盐矿物（例如橄榄石，辉石，长石，石榴石和石英）中的氧同位素比。但是，某些矿物族表现出固溶系列，并且这些矿物相的大组成光谱将导致SIMS分析过程中的基质效应。必须通过重复分析组成相似的标准品来校正这些基质效应，以确保获得准确的结果。为了扩大SIMS对常见火成岩中固溶矿物群的当前适用性，我们对源自意大利Stromboli的新型辉石（NRM-AG-1）和顽辉石（NRM-EN-2）参考材料进行了SIMS均质性测试和北卡罗莱纳州的韦伯斯特。通过激光氟化（LF）分析标准矿物的等分试样，以确定其δO-18值。然后，对相同的辉石晶体的随机取向的片段进行重复的SIMS测量，得出NRM-AG-1和ΔO-18的范围分别小于+/- 0.42和+/- 0.58千分之（2 sigma）。 NRM-EN-2。均质性测试验证了NRM-AG-1和NRM-EN-2没有显示任何晶体学取向偏差，并且它们在20微米尺度上足够均匀，可以用作SIMSδO-18分析的常规矿物标准。随后，我们在印度尼西亚默拉比火山最近喷发的辉石晶体上测试了新的标准材料。通过SIMS（n = 204）获得的Merapi辉石的δO-18值与LF衍生的Merapi辉石的δO-18值相吻合，但与通过常规氟化获得的大量矿物和整个岩石数据不同。由于掺入了矿物和玻璃夹杂物，部分样品被抵消为较高的δO-18值，这在一定程度上反映了地壳污染过程。 Merapi辉石SIMS数据反过来在5.8千分之一处显示了一个频率峰值，这使我们可以将Merapi初级镁铁质岩浆的δO-18值估算为接近6.1千分率（假设封闭系统区分）。 （C）2016 Elsevier B.V.保留所有权利。

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