Analysis of deep-ocean sediments from the TAG hydrothermal field (MAR, 26° N): application of short-wave infrared reflectance (SWIR) spectra for offshore geochemical exploration
Analysis of deep-ocean sediments from the TAG hydrothermal field (MAR, 26° N): application of short-wave infrared reflectance (SWIR) spectra for offshore geochemical exploration
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TAG 热液场（3 月，北纬 26°）深海沉积物分析：短波红外反射（SWIR）光谱在近海地球化学勘探中的应用
DOI：
10.1007/s11368-020-02691-3
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发表时间：
2020
影响因子：
3.6
通讯作者：
Milinovic J
中科院分区：
文献类型：
--
作者：
Milinovic J
目的快速短波红外（SWIR）光谱分析等经济有效的分析方法已被应用于关键原材料（CRM）的有效勘探，方法在对大西洋中脊跨大西洋大地测量（TAG）热液区的海洋学使命中采集了深海沉积物的重力岩心样品（MAR，26° N）. SWIR反射光谱（因变量）的样品进行了数学测试对参考地球化学数据（自变量），通过常规分析（ICP/OES，ICP/MS），应用全交叉验证多元偏最小二乘回归（CVPLSR）后。以参数-残差预测偏差（RPD）值评价CVPLSR模型：RPD > 2.5（用于筛选目的的令人满意的校准模型）和RPD > 5.0结果CVPLSR建模为几种矿物组分的测定提供了显著的结果：主要元素（Fe和Si）的RPD值分别为3.65和2.84，这表明其常规分析的可行性，而Ca的RPD值为5.51，从而确保了其质量控制，在所研究的位置的沉积物样品中，SWIR分析。稀土元素中，铈（RPD = 2.55）和铒（RPD = 2.59）取得了最令人满意的results.ConclusionsThe研究结果突出的好处，迅速获得的经验SWIR反射率数据，可用于近实时勘探地球化学矿床托管在深海沉积物。
PurposeThe cost-efficient methods of analysis, such as rapid short-wave infrared (SWIR) spectral analysis, have been applied for the efficient exploration of critical raw materials (CRM), including mineral components and rare earth elements (REE) from the deep-ocean sediments.MethodsGravity cored sediment samples were collected during an oceanographic mission to the Trans-Atlantic Geotraverse (TAG) hydrothermal field of the Mid-Atlantic Ridge (MAR, 26° N). SWIR reflectance spectra (dependent variable) of samples were mathematically tested against referent geochemical data (independent variable), obtained by conventional analysis (ICP/OES, ICP/MS), after applied full cross-validation multivariate partial least square regression (CVPLSR). Value of parameter-residual predictive deviation (RPD) was used for evaluation of CVPLSR modeling: RPD > 2.5 (satisfactory calibration model for the screening purposes) and RPD > 5.0 (model adequate for the quality control of the studied elements).ResultsThe CVPLSR modeling provided significant results for the determination of several mineral components: major elements (Fe and Si) had the values of RPD equal to 3.65 and 2.84, respectively, which indicated a viable potential for their routine analysis, whereas RPD for Ca was equal to 5.51, thus assuring its quality control by SWIR analysis, in sediment samples of the studied location. Among the REE, Ce (RPD = 2.55) and Er (RPD = 2.59) yielded the most satisfactory results.ConclusionsThe findings highlight the benefit of rapidly obtained empirical SWIR-reflectance data, which can be used for near-real-time exploration of geochemical deposits hosted in deep-ocean sediments.