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首页> 外文期刊>Contributions to Mineralogy and Petrology >FTIR spectroscopy of Ti-chondrodite, Ti-clinohumite, and olivine in deeply subducted serpentinites and implications for the deep water cycle
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FTIR spectroscopy of Ti-chondrodite, Ti-clinohumite, and olivine in deeply subducted serpentinites and implications for the deep water cycle

机译：俯冲蛇纹岩中的钛软骨岩，钛斜辉石和橄榄石的FTIR光谱及其对深水循环的影响

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Separated olivine grains from a deeply subducted serpentinized wehrlite (Changawuzi in the western Tianshan ultrahigh-pressure belt, China) were analysed with unpolarized transmission FTIR and the Ti contents were determined using LA-ICP-MS. The major bands in the olivine spectra display striking similarities to Ti-clinohumite and are interpreted as OH in lamellae. The quantification of the water content in lamellae requires calibration of the IR-absorption for such bands. We have obtained a new absorption coefficient for Ti-clinohumite of 0.125+/-0.017 ppm cm" based on polarized FTIR measurements on three orthogonal sections through a large single crystal of Ti-clinohumite from Val Malenco, which has a known water content of 1.53 wt%. The resulting water content in olivine using this calibration factor ranges from 440 to 2,600 ppm and correlates positively with the Ti content that ranges from 130 to 1,400 ppm. For the quantification of the water content in Ti-chondrodite and Ti-clinohumite that are associated with olivine, we developed a new method using attenuated total reflectance FTIR spectroscopy. Ti-chondrodite and Ti-clinohumite display similar IR bands at -3,562,3,525 and -3,583-3,586 cm"1. As in olivine, the water content and Ti content correlate in both Ti-clinohumite and Ti-chondrodite, indicating an inter-growth of these minerals, which has been confirmed by TEM analyses. Our results confirm previous suggestions that there is a strong correlation between the Ti content of ultramafic rocks and their capacity to transport water to the deeper mantle in subduction zones beyond conditions where hydrous phases are stable.
机译：利用非极化透射FTIR分析了深俯冲的蛇纹化白云母（中国天山西部超高压带中的长安子孜）中的橄榄石颗粒，并使用LA-ICP-MS测定了Ti的含量。橄榄石光谱中的主要谱带显示出与Ti-Clinohumite惊人的相似性，并被解释为片状OH。薄片中水含量的定量需要对这些条带的红外吸收进行校准。我们基于来自瓦尔马林科的大型Ti-Clinohumite单晶在三个正交截面上的极化FTIR测量结果，获得了新的Ti-Clinohumite吸收系数为0.125 +/- 0.017 ppm cm“，已知水含量为1.53使用此校准因子，橄榄石中的水含量范围为440至2,600 ppm，并且与130至1,400 ppm的Ti含量呈正相关。与橄榄石有关的是，我们开发了一种使用衰减全反射FTIR光谱的新方法。钛长方晶石和钛斜辉石在-3,562,3,525和-3,583-3,586 cm-1处显示相似的IR波段。如同橄榄石一样，Ti斜发烟石和Ti硬质球石中的水含量和Ti含量相关，表明这些矿物的共生，这已通过TEM分析得到证实。我们的结果证实了先前的建议，即超镁铁质岩石的Ti含量与其将水输送到含水相稳定条件以外的俯冲带中的深层地幔中的能力之间存在很强的相关性。

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