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首页> 外文期刊>Planetary and space science >Mineralogy and spectroscopy (VIS near infrared and micro-Raman) of chromite from Nidar ophiolite complex, SE Ladakh, India: Implications for future planetary exploration
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Mineralogy and spectroscopy (VIS near infrared and micro-Raman) of chromite from Nidar ophiolite complex, SE Ladakh, India: Implications for future planetary exploration

机译：印度SE拉达克Nidar蛇绿岩综合体中铬铁矿的矿物学和光谱学（近红外和显微拉曼光谱）：对未来行星探索的意义

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To determine the chemical composition of minerals on planetary surfaces from spectroscopic data, it is required to establish the link between mineralogy, spectroscopy and chemical composition of rock forming minerals on Earth. To meet this requirement, we performed integrated mineralogical and spectroscopic (Visible-Near Infrared and micro Raman) characterisation of chromite from the chromitite layer in the mantle section of the Nidar ophiolite complex, SE Ladakh, J&K, India. Chromite commonly occurs as monominerallic chromitite layers (up to 1 meter wide) and disseminated grains within the dunites and harzburgites. The Cr2O3 content is generally high (>60 wt %) and chemically homogeneous across the grains. The X-ray Diffraction (XRD) analyses show highest peak intensity at similar to 36 degrees 2 theta, followed by other diagnostic peaks for chromite. Micro-Raman of chromite yields very strong diagnostic Raman active vibrational modes at 685 cm(-1) (A(1g)), followed by 520 cm(-1) (F-2g((2))). The other peaks, viz. 446 cm(-1) and 610 cm (1) are rather weak and correspond to E-g and F-2g, respectively. VNIR (0.4 mu to 2.4 mu) reflectance spectroscopy of chromite suggested strong absorption near 2 mu m and could be useful to quantify the chemical composition (especially Cr O-2(3), Al2O3 and Cr#). We found a good correlation of VNIR absorption and chemical composition of chromite (e.g. band positions versus Al2O3 and Cr# are well within 95% correlation interval). The intense Raman peak at 685 cm(-1) corresponds to higher Cr content. This study, therefore, implies a significant understanding in determination of mineral chemistry (especially Chromites) by VNIR and micro Raman spectroscopy, which could be a useful tool for the future planetary exploration.
机译：为了从光谱数据确定行星表面矿物的化学成分，需要在矿物学，光谱学和地球上成岩矿物的化学成分之间建立联系。为满足此要求，我们对印度J＆K SE Ladakh Nidar蛇绿岩复合体地幔部分的铬铁矿层中的铬铁矿进行了矿物学和光谱学（可见-近红外和显微拉曼）表征。铬铁矿通常以单矿物铬铁矿层（最大1米宽）的形式出现，并散布在榴辉石和哈氏石中。 Cr2O3含量通常很高（> 60 wt％），并且整个晶粒化学均一。 X射线衍射（XRD）分析显示，在类似于36度2 theta的最高峰强度，其次是亚铬酸盐的其他诊断峰。亚铬铁矿的微拉曼在685 cm（-1）（A（1g））处产生非常强的诊断拉曼主动振动模式，然后在520 cm（-1）（F-2g（（2）））处产生。其他峰，即。 446 cm（-1）和610 cm（1）较弱，分别对应于E-g和F-2g。铬铁矿的VNIR（0.4微米至2.4微米）反射光谱表明在2微米附近有很强的吸收作用，可用于定量化学成分（尤其是Cr O-2（3），Al2O3和Cr＃）。我们发现VNIR吸收与亚铬酸盐的化学成分之间具有良好的相关性（例如，谱带位置与Al2O3和Cr＃的相关性均在95％相关区间内）。在685 cm（-1）处的强烈拉曼峰对应较高的Cr含量。因此，这项研究意味着对通过VNIR和显微拉曼光谱法测定矿物化学（尤其是铬铁矿）的认识，这可能是未来行星探索的有用工具。

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