Spectroscopic Characterization and Quantitative Estimation of Natural Weathering of Silicates in Sediments of Dikrong River, India
Spectroscopic Characterization and Quantitative Estimation of Natural Weathering of Silicates in Sediments of Dikrong River, India
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DOI：
10.4236/jmp.2015.611164
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发表时间：
2015-09
期刊：
影响因子：
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通讯作者：
B. Saikia;S. R. Goswami;R. Borthakur;I. B. Roy;R. R. Borah-R.
中科院分区：
文献类型：
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作者：
B. Saikia;S. R. Goswami;R. Borthakur;I. B. Roy;R. R. Borah-R.
沉积物样本是从迪克隆河的不同地点采集的，以评估风化性质和矿物特征。傅里叶变换红外 (FTIR) 和 X 射线荧光 (XRF) 光谱技术已用于表征沉积物样品中的矿物质。研究了斜长石蚀变指数（PIA）、化学蚀变指数（CIA）和成分变化指数（ICV）来评估沉积物的风化性质。所得结果表明存在不同结构的石英、长石和高岭石作为主要矿物。碳酸盐和有机碳作为次要矿物质被发现。 SiO2 与主量元素的相关性证实了块状石英颗粒的存在和原生沉积环境。据报道，邻近区域存在变质焦磷辉石 (MnTiO3)。本研究中 1611 - 1622 cm?1 之间红外吸收峰的存在表明硅酸盐矿物的风化变质起源。成分变化指数表明存在较少的粘土矿物和较多的造岩矿物，例如斜长石和碱长石。结果表明该区属于中硅酸盐风化区。
The sediments samples were collected from the Dikrong River at various sites to assess the weathering nature and mineral characterization. The Fourier Transform Infrared (FTIR) and X-ray fluorescence (XRF) spectroscopic techniques have been used to characterization of minerals in the sediment samples. The plagioclase index of alteration (PIA), chemical index of alteration (CIA) and index of compositional variation (ICV) are investigated for evaluating the weathering nature in the sediment. The obtained results show the presence of quartz, feldspar in different structure and kaolinite as major minerals. Carbonates and organic carbon are found as minor minerals. The correlations of SiO2 with major elements are authenticated the presence of bulk quartz grains and primary depositional environment. The presence of metamorphosed pyrophanite (MnTiO3) in the adjoined areas is reported. The presence of infrared absorption peaks in between 1611 - 1622 cm?1 in this study is indicative to the weathered metamorphic origin of the silicate minerals. The index of compositional variation indicates the presence of less clay minerals and more rock forming minerals such as plagioclase and alkali-feldspar. The obtained results exhibit the area belongs to the intermediate silicate weathering.