X-RAY FLUORESCENCE DETERMINATION OF MAJOR ROCK FORMING ELEMENTS IN SMALL SAMPLES 50 and 110 mg

Amosova, Alena A.; Panteeva, S. V.; Татаринов, В. В.; Чубаров, В. М.; Finkelshtein, А. L.

doi:10.15826/analitika.2015.19.2.009

Cited by 18 publications

(10 citation statements)

References 1 publication

(2 reference statements)

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“…Bulk-rock major-element contents were obtained by X-ray fluorescence (XRF) method, using S8 Tiger spectrometer (Bruker AXS, Karlsruhe, Germany), according to the technique of [36]. Ti was determined by XRF on the S4 Pioneer spectrometer (Bruker AXS) with Rh-anode tube at 40 kV accelerating voltage and 50 mA current.…”

Section: Methodsmentioning

confidence: 99%

From Decompression Melting to Mantle-Wedge Refertilization and Metamorphism: Insights from Peridotites of the Alag Khadny Accretionary Complex (SW Mongolia)

et al. 2020

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This study reports on mineral and bulk rock compositions of metaperidotites from the Alag Khadny accretionary complex in SW Mongolia, to reveal their nature and relationships with associated eclogites. The peridotites preserved original porphyroclastic textures and are composed of olivine, orthopyroxene relics, Cr-spinel, interstitial (not residual) clinopyroxene, and secondary chlorite, tremolite, olivine, Cr-magnetite, clinopyroxene, and antigorite. Cr-spinel has Cr# of 0.3–0.5, and primary olivine shows Mg# of 0.90–0.92. The pyroxenes are high-magnesian with low Al2O3 and Cr2O3. The bulk rocks have U-shaped normalized trace-element patterns with enrichment in LILE, L-MREE relative to HREE, and weak Pb–Sr peaks and Nb–Zr–Hf minima. Interstitial clinopyroxene exhibits V- and U-shaped normalized REE patterns with (La/Yb)N > 1 (Yb = 1.2–3 of chondritic values) and enrichment in fluid-mobile elements and Zr. HREE abundances of clinopyroxene can be simulated by 23–26% partial melting of depleted mantle starting at garnet-facies (6–8%) depths, followed by hydrous or anhydrous melting at spinel-facies depths L-MREE characteristics of clinopyroxenes can be simulated by further interaction of harzburgites with an island-arc basaltic melt in a supra-subduction environment. The association of hydrous secondary minerals in the Alag Khadny peridotites suggests their retrograde metamorphism at 1.6–2.0 GPa and 640–720 °C, similar to P–T conditions reported earlier for the spatially associated eclogites. This supports metamorphism of the Alag Khadny peridotites in a mantle wedge, followed by joint exhumation of peridotites and eclogites. Given the findings above and implying the regional geological background, we advocate for a sequential Neoproterozoic evolution the Alag Khadny harzburgites from (1) their formation by decompression partial melting in an Early Neoproterozoic or older spreading center of a mid-ocean or back-arc setting, and (2) refertilization by supra-subduction melts, followed by (3) Late Neoproterozoic–Early Cambrian hydrous-fluid metamorphism and juxtaposition with eclogites.

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Section: Methodsmentioning

confidence: 99%

From Decompression Melting to Mantle-Wedge Refertilization and Metamorphism: Insights from Peridotites of the Alag Khadny Accretionary Complex (SW Mongolia)

et al. 2020

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“…The fusion technique previously used for quantitative X-ray analysis of rocks [29] was taken as a basis to obtain homogeneous glass. According to this technique, 0.5 g of sample calcined at 950 C for 4 hr was mixed with 7.5 g of flux (mixture of lithium metaborate and tetraborate) and seven drops of the releasing agent (4% LiBr solution).…”

Section: Methodsmentioning

confidence: 99%

X‐ray fluorescence determination of major elements in ferromanganese nodules

2020

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In this article, the X‐ray fluorescence technique is proposed for the quantitative determination of major elements in ferromanganese nodules and crusts, which is a necessary stage of the oceanic ferromanganese deposits investigation and development. The research was performed using a wavelength‐dispersive spectrometer S4 Pioneer (Bruker AXS, Germany). Certified reference materials of ferromanganese nodules, cobalt‐bearing ferromanganese crusts and pelagic sediments were dried and prepared by two different techniques: the pressing of powder samples on a boric acid substrate and the homogenization by fusion with lithium tetraborate in an electric furnace at 1050°C. For each sample preparation technique, different forms of calibration curves (linear or quadratic) and methods of matrix effect correction (fundamental parameters or empirical intensities coefficients) were examined. The uncertainty of the proposed technique was assessed by analyzing the certified reference material FeMn‐1 and by comparison with the atomic absorption spectrometry, flame photometry and spectrophotometry results. Analysis of both fused beads and pressed pellets provides a quantitative determination of the major elements in the oceanic ferromanganese nodules.

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“…Results of whole rock X-ray fluorescence and ICP-MS analyses for the dikes are given in Table 1. Whole rock X-ray fluorescence analyses were performed on a S4 Pioneer or a S8 Tiger spectrometer (Bruker AXS, Karlsruhe, Germany) with the 4-kW X-ray tube fitted with a Rh anode target disk according to the methodology in [27]. Samples for analysis were homogenized by fusing with a flux (mix of lithium metaborate and lithium tetraborate) in platinum crucibles in a TheOX electric fusion instrument (Claisse, Quebec City, QC, Canada) at 1050 • C. Melts were formed into radiator elements 32 mm in diameter.…”

Section: Methodsmentioning

confidence: 99%

Early Ediacaran Magmatism in the Yenisei Ridge and Evolution of the Southwestern Margin of the Siberian Craton

et al. 2020

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We present the first comprehensive data for the early Ediacaran stage of evolution of the western active continental margin of the Siberian Craton (Yenisei Ridge). U-Pb (SHRIMP-II SIMS) data for zircons from dikes of picrodolerites, quartz diorites, and leucocratic granites show that they were emplaced at 625 ± 5, 623 ± 8, and 626 ± 5 Ma, respectively, which indicates a narrow time window of Ediacaran magmatic events. The mafic tholeiitic rocks have OIB and E-MORB mantle components in their magmatic sources. Mineralogical and geochemical observations showed that the mantle-sourced mafic melts assimilated some crustal material, forming Th-enriched dikes of intermediate composition and K- and Rb-enriched felsic rocks. The possible geodynamic conditions for the formation of these early Ediacaran dikes are shown and a geodynamic model is presented for the development of the Yenisei Ridge orogen from the late Cryogenian to the late Ediacaran.

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X-RAY FLUORESCENCE DETERMINATION OF MAJOR ROCK FORMING ELEMENTS IN SMALL SAMPLES 50 and 110 mg

Cited by 18 publications

References 1 publication

From Decompression Melting to Mantle-Wedge Refertilization and Metamorphism: Insights from Peridotites of the Alag Khadny Accretionary Complex (SW Mongolia)

From Decompression Melting to Mantle-Wedge Refertilization and Metamorphism: Insights from Peridotites of the Alag Khadny Accretionary Complex (SW Mongolia)

X‐ray fluorescence determination of major elements in ferromanganese nodules

Early Ediacaran Magmatism in the Yenisei Ridge and Evolution of the Southwestern Margin of the Siberian Craton

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