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首页> 外文期刊>Brazilian Journal of Geology >Linking gemology and spectral geology: a case study of elbaites from Seridó Pegmatite Province, Northeastern Brazil
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Linking gemology and spectral geology: a case study of elbaites from Seridó Pegmatite Province, Northeastern Brazil

机译：将宝石学与光谱地质联系起来：以巴西东北塞里奇·伟晶岩省的Elbaite为例

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摘要

reflectance spectroscopy is a fast tool for mineral identification and classification. We conducted spectral characterization of elbaite samples (n = 30) from Seridó Pegmatite Province, Borborema Province, NE Brazil, using a FieldSpec portable instrument and geochemical data from electron probe microanalysis. Visual interpretation of reflectance spectra reveals the absorption features in the visible to near infrared (350-1,200 nm) range related to the electronic transition processes of iron (e.g., ~720, ~1,180 nm), copper (e.g., ~694, ~922 nm) and manganese (e.g., ~400, ~520 nm) ions. In general, electron probe microanalysis data show correlation with the absorption features related to chromophore elements (e.g., Cu, Fe, Mn), but the complex crystal structure of the tourmalines also accounts for the generation of absorption features. Vibrational processes in the short-wave infrared (1,200-2,500 nm) spectral range appear associated with Mn-OH, OH, Al-OH, H 2 O and B-OH bonds. A statistical approach, using principal component analysis, was chosen for distinguishing tourmalines of different composition. We discriminated tourmalines characterized by green, blue, blue-green, red/purple colors, as well as the colorless ones. This included the Paraíba tourmaline, a high value variety of elbaite that is the focus of exploration carried out in Seridó Pegmatite Province.
机译：反射光谱是矿物鉴定和分类的快速工具。我们使用FieldSpec便携式仪器和电子探针显微分析的地球化学数据，对巴西东北部Borborema省SeridóPegmatite省的Elbaite样品（n = 30）进行了光谱表征。反射光谱的视觉解释揭示了与铁（例如〜720，〜1,180 nm），铜（例如〜694，〜922）的电子跃迁过程有关的可见光到近红外（350-1,200 nm）范围内的吸收特征纳米离子和锰离子（例如〜400，〜520 nm）。通常，电子探针显微分析数据显示与发色团元素（例如，Cu，Fe，Mn）有关的吸收特征的相关性，但是电气石的复杂晶体结构也解释了吸收特征的产生。短波红外（1200-2500 nm）光谱范围内的振动过程似乎与Mn-OH，OH，Al-OH，H 2 O和B-OH键有关。选择使用主成分分析的统计方法来区分不同成分的电气石。我们区分了以绿色，蓝色，蓝绿色，红色/紫色为特征的电气石，以及无色的电气石。其中包括帕拉伊巴碧玺，这是一种高价值的厄贝石，是塞里多·伟晶岩省开展勘探的重点。

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