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Several of the Siberian platform's more than 30 diamondiferous areas are rich in micas kimberlites, some of which are rocks of the Nakyn field diatremes. The rocks of this field pipes belong to one of a petrochemical variety of kimberlites, and the identified concentrations of petrogenic oxides are correlated with a variety of diatremes' occurrences, according to different depths of diatremes. Correlation study of minerals-neoformations in conjunction with potential diamondiferousness of kimberlites showed an inverse relationship between mica, quartz, and dolomite grade with an increasing amount of useful component. Preva-lence of transparent diamonds of octahedral to rhombic dodecahedral habit of variety I is a common feature of inspected micaceous kimberlites, with a notable presence of crystals with a variety IV envelope.
Source link: https://doi.org/10.17072/chirvinsky.2022.85
Ba-Cl micas and Cl-phosphates were discovered in garnet phosphates as a part of the matrix or in polyphase inclusions in garnets. This is the second world record of goryainovite, and the first evidence that Ca can be partially replaced by Sr in this mineral. 0. 73 Mg 0. 39 Si 2. 02 Cl 1. 88, XFe 0. 88, the most Cl-rich mica so far described from natural samples and comes nearest to chloroferrokinoshitalite BaFe 3. 91 Si 2. 69 Mg 0. 97 Mo. 0. 83 Mo. 0. 79 Cl 1. 88 XFe 0. 88, XFe 0. 88 XFe 0. 88, XFe 0. 88, XFe 0. 88, which is the most Q 0. 95 Mg 0. 95 K 0. 36 Mg 2. 95 Mg 2. 89 Mg 0. 95 Si 2. 88 XFe 0. 89 Mg 0. 89 Mg 0. 88 XFe 0. 89 Mg 0. 91 K 0. 96 Mg 0. 93 Mg 0. 96 Mg 0. 89 Mg 0. 93 Mg 0. 33 Mg 0. 89, XFe 0. 93 Mg 0. 89 Mg 0. 88, XFe 0. 88, XFe 0. 88, XFe 0. 88, XFe 0. 88 XFe 0. 88, XFe 0. 89 Mg 0. 90 Mg 0. 89 Ba 1 Ba 1 Si -1 linking the composition of phlogopite and kinoshitalite indicates the positive correlation of Ba with Al and their negative correlation with Si and K, which is correlated to Ba's coupled substitution Ba 1 Al 1 K -1 Si -1. Since the incorporation of either Cl or Ti + O correlates with the XFe content of mica, the XFe ratio can be the determining factor in mica's ability to introduce Cl into its crystal lattice, mica's ability to absorb Cl can be a significant factor. In several cases, two micas with similar composition corresponding closer to chloroferrokinoshitalite or oxykinoshitalite coexist in a single polyphase inclusion, as shown by distinct representations of XFe, Ti, and Cl. In the metasomatizing fluid/melt that interacted with garnet pyroxenites, the presence of Cl-rich phases alongside carbonates indicates high levels of Cl and CO2 in the metasomatizing fluid/melt.
Source link: https://doi.org/10.5194/egusphere-egu22-7935
At CEA, there have been a number of experiments carried out within the framework of the CEA's Generation IV reactor program. New research conducted in MICAS investigates the possibility of vortex formation at one of the internal heat exchangers nozzle, which may lead to gasentrainment from the pool surface. Multi-scale calculations are carried out using Computational Fluid Dynamics in order to better identify the vortex formation at the IHX plenum and the associated potential gas entrainment into the vortex from the hot pool free surface.
Source link: https://doi.org/10.1115/icone28-65276
Green micas from the Archaean Isua and Malene supracrustal rocks of southern West Greenland's southern West Greenland's southwest Green micas reveal an astonishingly wide compositional range, from almost pure muscovite to versions with up to 5% Cr2O3 and - 8 wt % BaO. These Ba- and Cr-rich micas are unlike previously reported 'fuchsite' studies and may be a new species of mica, the confirmation of which needs further mineral-chemical and crystallographic investigation. During continuous up-to- 0. 45 cations/formula, Cr-substitution on the mica interlayer- or A-site appears continuously up to 0. 22 cations/formula, followed by a compositional hiatus to styles with 0. 90 cations/formula. The Ba and Cr may have arisen from detrital chromite and sedimentary barite components in the sedimentary protolith's sedimentary protolith's deposition of circulating hydrothermal fluids, or to secondary processes such as deposition from circulating hydrothermal fluids.
Source link: https://doi.org/10.34194/rapggu.v112.7814
First studies on chlorine and fluorine in apatites, micas, and amphiboles of eight of the Siberian Platform's eight difficult blocks were conducted on the basis of new factual and analytical results. Fluorine has magnesiophilic properties, and Clu2013f and FEU2013f trends show an increase in the Cl content and a decrease in the F content in the minerals with increasing f. Chlorine clearly has ferrophilic characteristics, and increasing f. Chlorine has crystallized properties. The micas are coexisting micas and amphiboles in the rock are similar to f value, but the amphiboles are higher in Cl than the amphiboles. At the MW, IW, and QIF buffer levels, we assume that the halogen-containing minerals crystallized under the pressure of halogen-u2013hydrocarbon fluids. The similarities of micas and amphiboles from various intrusive complexes in Clu2013f and Fu2013f trends indicate the same mechanisms for melt separation and mineral crystallization.
Source link: https://doi.org/10.1016/j.rgg.2017.05.003
Complex impedance spectroscopy experiments were carried out in muscovite and biotite micas, perpendicular to their cleavage planes, over a wide range of frequencies and temperatures that had never been recorded so far, indicating complex impedance spectroscopy experiments. To investigate micas' electrical properties and the electrical signatures of the dehydration/dehydration reaction processes, different formalisms of data representation were employed, namely, Cole-Cole plots of intricate impedance, complicated electrical conductivity, and electric modulus. Our results reveal that ac-conductivity is influenced by the chemical hydroxyls and the different amounts of transition metals in biotite and muscovite micas.
Source link: https://doi.org/10.3390/ma13163513
Abstract The Dahutang tungsten deposit, located in South China's Yangtze Block, is one of the world's largest tungsten deposits. The pluton in the Dahutong ore block's Central segment of the Dahutang tungsten deposit's Central segment is characterized by multi-stage intrusive phases, including biotite granite, muscovite granite, and Li-mica granite, according to a ton in the Dalingshang ore block. P and F-depletion is particularly prominent and abundant in P and F, as shown by decreasing bulk-rock N ratios and total rare earth element amounts from the biotite granite to muscovite granite and Li-mica granite, indicating an evolution involving the fractional crystallization of plagioclase. In the Li-mica granite's biotite granite, muscovite granite, and Li-muscovite granite, the micas were classified as lithian biotite and muscovite. Micas in the muscovite granite and Li-mica granite rock layer reveal compositional structuration in which Si, Rb, F, Fe, and Li increase, and Li decreases gradually from core to mantle, demonstrating magmatic differentiation. Both the magmatic and hydrothermal evolutions in the Dahutang deposit were closely associated with W mineralization. The variation in W contents of the micas matches those of Li, F, Rb, and Cs contents, indicating that both the magmatic and hydrothermal evolutions were closely linked to W mineralization in the Dahutang deposit. The chemical zoning of muscovite and Li-micas does not only illustrate W enrichment by magmatic change and volatiles, but also follows the leaching of W by the fluids.
Source link: https://doi.org/10.2138/am-2019-6796
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