scholarly journals Estimation of the Range of Variation in the Mineral Composition of Silicate Lake Bottom Sediments Using Data from XRD and XRF

2020 ◽  
pp. 260-272
Author(s):  
Roman V. Smelyi ◽  
Alexander L. Finkelshtein ◽  
Igor S. Yakimov ◽  
Alena A. Amosova ◽  
Victor M. Chubarov
Keyword(s):  
Phase Analysis ◽  
Mineral Composition ◽  
Bottom Sediments ◽  
Fluorescence Analysis ◽  
X Ray ◽  
Group Content ◽  
Lake Bottom ◽  
Mineral Components ◽  
Using Data ◽  
Lake Bottom Sediments

A method is proposed for estimating the range of mineral group content in the cores of silicate bottom sediments of lakes based on the search for the minimum and maximum content of stoichiometric minals that make up the group of minerals, provided that the balance of the mineral composition and the content of elements in the sample is observed. The mineral components were determined using the method of qualitative X-ray phase analysis, the contents of the main rock-forming elements were determined by X-ray fluorescence analysis. Comparison with the results of quantitative X-ray phase analysis showed that the contents of mineral groups either lie in the range calculated in the extreme search procedure based on data on the element composition, or overlap with the calculated range within the measurement error. The systematic discrepancy between the results of calculating the range of content of the silicon dioxide phase and the results of quantitative X-ray phase determination of quartz observed for the samples under consideration is due to the presence of an X-ray amorphous phase of biogenic silica. The proposed method for estimating the range of mineral group content is easy to implement, uses the publicly available MS Excel software, and can be useful for estimating variations in mineral composition by core depth, in conditions of frequent shortages of individual sample material distributed between different methods of analysis

scholarly journals Determination of the Mineral Composition of the Lake Bottom Sediments by X-Ray Diffraction Method and Physico-Chemical Modelling

2019 ◽  
pp. 382-394
Author(s):  
Roman V. Smelyy ◽  
Ekaterina V. Kaneva ◽  
Anastasiya V. Oshchepkova ◽  
Valerii A. Bychinskii ◽  
Tat’yana S. Aisueva ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Mineral Composition ◽  
Bottom Sediments ◽  
Diffraction Method ◽  
Least Square ◽  
X Ray Diffraction ◽  
X Ray ◽  
Relative Standard ◽  
Lake Bottom ◽  
Lake Bottom Sediments

The paper reports comparison of three approaches to define the contents of minerals and mineral groups in the carbonate-silicate lake bottom sediments. The two approaches are based on the method of X-ray powder diffraction. The first one treats with the Rietveld Method in the software DIFFRAC Plus diffractometer D8 Advance (PDF-2 database). The second one uses the method of reference intensities (corundum ratios) and optimization of the model powder patterns from the X-ray phase standards of PDF-2 database and equations of the element balance with regularization of the least square functional. The third approach of physic-chemical modeling selects probable single mineral and multi-component phases through modelling the sold solutions, and it uses the data on the element composition obtained by XRF technique, as well as the data of X-ray diffraction on the qualitative mineral composition. Thirty samples of bottom sediment cores taken in the Zun-Torey Lake in East Siberia were analyzed by the three approaches described herein. The contents of mineral groups (feldspars, quartz, clay minerals and carbonates) varied within the range 10-40 mass %. The discrepancies between obtained results show the standard deviation ranging from 2 to 9 mass %. A relative standard deviation commonly provides the value below 30 %, so such determinations could be considered quantitative ones. With regard to the acquired data, it is hard to prefer this or that approach. Available data was employed to assess the error of X-ray phase powder analysis in measuring the abundance of mineral groups in the carbonate-silicate sedimentary rocks in the absence of reference materials to compare with certified mineral composition

scholarly journals Geochemical indicators of paleo-seismicity based on the data of study of Fumarolnoe lake bottom sediments (Kamchatka, Uzon)

2019 ◽  
Vol 98 ◽  
pp. 08012
Author(s):  
Ivan Kirichenko ◽  
Nikolay Dobretsov ◽  
Sergey Zhmodik ◽  
Elena Lazareva ◽  
Dmitry Belyanin
Keyword(s):  
Mineral Composition ◽  
Bottom Sediments ◽  
Spectral Methods ◽  
Chemical Elements ◽  
Geochemical Indicators ◽  
Lake Bottom ◽  
Lake Bottom Sediments ◽  
Periodic Changes

The distribution of chemical elements in bottom sediments of Fumarolnoe lake was obtained by XRFA. The mineral composition of the sediment was examined by SEM, XPA. Variations in contents of alkaline elements in the column of bottom sediments of the Fumarolnoe Lake have been studied using spectral methods (Wavelet and Fourier analyses). It has been established that concentrations of these elements change periodically, periods being correlated with periodic changes in seismic conditions of the present region

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