Spectral and chemical studies of iron and manganese oxyhydroxides in laterite developed on ultramafic rocks,Resource Geology

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Spectral and chemical studies of iron and manganese oxyhydroxides in laterite developed on ultramafic rocks
Resource Geology ( IF 1.1 ) Pub Date : 2021-07-05 , DOI: 10.1111/rge.12272
Carmela Alen J. Tupaz ₁ , Yasushi Watanabe ₁ , Kenzo Sanematsu ₂ , Takuya Echigo ₁

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Iron (Fe) oxyhydroxides (goethite and hematite) and manganese (Mn)-oxyhydroxides (lithiophorite, asbolane, lithiophorite-asbolane intermediate) are typically fine-grained and poorly crystalline in nature, and as such are difficult to identify by conventional X-ray powder diffraction. This study employs Raman spectroscopy and electron probe microanalysis (EPMA) to characterize Fe- and Mn-oxyhydroxides found in the Berong Ni–Co laterite deposit at Palawan Island, Philippines. Accurate identification of these minerals is important because these phases contain high Ni and Co contents. Goethite and hematite occur in a wide range of textures, which are related to their compositional variations with respect to Ni, Al, Mn, Cr, and Si. The change in the intensity of the Raman peaks can be linked to the variable concentrations of Ni, Al, Mn, Cr, and Si in goethite. These chemical variations affect the textural transformation of goethite from amorphous to cryptocrystalline. Lithiophorite, asbolane and their intermediates were properly distinguished using Raman spectroscopy. EPMA data shows that these Mn minerals contain appreciable concentrations of Ni, Co, Al, and Fe. The band shift from lithiophorite to asbolane end terms in the 486–593 cm⁻¹ domain indicates the substitution of Al in lithiophorite by Ni, Co, and Fe.

中文翻译：

超基性岩上发育的红土中铁和锰羟基氧化物的光谱和化学研究

铁 (Fe) 羟基氧化物（针铁矿和赤铁矿）和锰 (Mn)-羟基氧化物（锂硫磷矿、asbolane、锂硫磷矿-asbolane 中间体）通常为细粒且结晶性差的性质，因此难以通过常规 X 射线识别粉末衍射。本研究采用拉曼光谱和电子探针微量分析 (EPMA) 来表征在菲律宾巴拉望岛 Berong Ni-Co 红土矿床中发现的 Fe-和 Mn-羟基氧化物。准确识别这些矿物很重要，因为这些相含有高 Ni 和 Co 含量。针铁矿和赤铁矿的质地范围很广，这与它们在 Ni、Al、Mn、Cr 和 Si 方面的成分变化有关。拉曼峰强度的变化与 Ni、Al、Mn、Cr、和针铁矿中的 Si。这些化学变化影响针铁矿从无定形到隐晶质的结构转变。使用拉曼光谱正确区分锂硫磷石、asbolane 及其中间体。EPMA 数据显示，这些 Mn 矿物含有可观的 Ni、Co、Al 和 Fe 浓度。486-593 cm 范围内的带从锂硫磷矿到 asbolane 末端项的转变^-1域表示锂硫磷矿中的 Al 被 Ni、Co 和 Fe 取代。

更新日期：2021-07-05

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