The correlations of δ41K with SiO2 and Al2O3 contents are attributed to the difference in K-O bond strengths. Compared to K-feldspar, the K content could be a better proxy for constraining the δ41K of plagioclase. Our results demonstrate that the δ41K of K-feldspar is dependent on its mineral chemistry, and its K isotopic composition may be ...
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Sand samples were collected from seven different locations along the California and Oregon coastlines where beach sediments and eolian coastal dunes are in close proximity (< 0.5 km) to each other. Beach sand was collected from the swash zone and dune sand was taken from the crests or lee faces of dunes. Loose sand was impregnated with epoxy and thin …
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Although the concentration of most of trace elements is lower in K-feldspar compared to biotite, the chemical composition of K-feldspar still reflects the fractionation model of the MDG system (Figs. 14 d-f). Li, Rb, and Cs values increase with fractionation, however, Sr behaves contradictory that is attributed to its much greater compatibility ...
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Compared to K-feldspar, the K content could be a better proxy for constraining the δ41K of plagioclase. Our results demonstrate that the δ41K of K-feldspar is dependent on its mineral …
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The main K- and Rb-bearing minerals in the BST pluton are mica and K-feldspar, which are mainly represented by phengite and microcline, respectively. From Zone-a to Zone-c, the Li, F, and Rb contents of phengite increase, and the K/Rb and Nb/Ta ratios decrease. The Rb and K/Rb ratios of microcline also decrease from Zone-a to Zone-c.
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Mineral dust particles are thought to be an important type of ice-nucleating particle (INP) in the mixed-phase cloud regime around the globe. While K-feldspar has been identified as being a ...
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feldspar minerals can be grouped, according to bulk compo-sition, into potassium-rich feldspar (K-feldspar) and Na- or Ca-rich species (plagioclase). While the series of plagioclase contains all fractions of Na and Ca, there is a mixing gap for K-feldspar. Only a limited fraction of KCcan be replaced by NaCor Ca2C. K-feldspar is subdivided into ...
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K-feldspar is a common rock-forming mineral that is likely representative of the source terranes and could offer a more unbiased constraint on the sediment routing system. ... 2007; Zhang et al., 2021a). Compared to zircon, K-feldspar is prone to both mechanical and chemical weathering (Wang et al., 2019; Zhang et al., 2021a), and partial ...
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Numerous studies suggest that 40Ar/39Ar K-feldspar analyses record continuous thermal histories from ∼300 °C to 150 °C due to the presence of multiple diffusion domains (MDDs).
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To assess the potential influence of secondary alteration (e.g., sericitisation of K-feldspar along microcracks) that could influence the quality, and therefore utility, of a reference material, one aliquot of K-feldspar crystals was acid leached (i.e., HCl and HNO 3) prior to isotope analysis, and the results compared with the unleached ...
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Abstract. Mineral dust particles are thought to be an important type of ice-nucleating particle (INP) in the mixed-phase cloud regime around the globe. While K-rich feldspar (K-feldspar) has been identified as being a particularly important component of mineral dust for ice nucleation, it has been shown that quartz is also relatively ice-nucleation active. Given quartz typically makes up …
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Wairakei hydrothermal K-feldspar, max. o'5 Myr old, is compared with Arkansas adularia 287 or zI4 Myr old, also containing both monoclinic and triclinic material. The comparison suggests that, ... thermal K-feldspar from an incrustation in drill-hole 8o at IO I2 ft is: SiO2 65" I, A120 3 18"9, K20 16.o, and Na20 0.2 weight %.1 The K20 and Na20 ...
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This is a similar increase compared to K-feldspar powder studies at similar Eu(III) concentration, where between pH 5.5 and 6.9 uptake increased by a factor of 2.5 (Neumann et al., 2021a).
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In all locations, models constrained only by ZHe data have limited resolving power for the past ∼600 m.y., compared to models that combine K-feldspar 40Ar/39Ar and ZHe data, which extends the recorded history into the Mesoproterozoic. Our model results suggest that two regional basement unroofing events occurred.
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Quartz and feldspar are the two most abundant minerals in the continental crust. The rheology of quartz and feldspar has been used to approximate the rheology of the upper and the lower crust, respectively. However, compared with quartz and plagioclase, the rheology of K-feldspar (Kfs) is much less characterized. We present here systematic axial compression deformation …
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of K-Feldspar Junjie Zhang and Sheng-Hua Li * Department of Earth Sciences, The University of Hong Kong, Hong Kong 999077, China; [email protected] * Correspondence: [email protected] ... Compared to quartz, the infrared stimulated luminescence (IRSL) of K-feldspar has several advantages: the IRSL signal of K-feldspar saturates at higher dose ...
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K-M) contd.: Photomicrographs of Phulad granite in cross polarized light showing K) inclusions also associated with K-feldspar grain boundary, L) large augen shaped K-feldspar megacrysts with ...
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For the first time, we found large inter-mineral fractionation of K isotopes in natural samples (up to 1.072‰), where plagioclase displays a significant enrichment of heavier K …
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Thus, we compared the K-Ar age of the hydrothermal K-feldspar with that of the magmatic K-feldspar. The magmatic K-feldspar of sample MIU1-2 (-261.9 masl of borehole MIU-1) ( Yuguchi et al., 2010 ), which was obtained near the samples of this study, has the K-Ar age of 68.2 ± 3.4 Ma (unpublished data collected by the Japan Atomic Energy Agency).
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Feldspars belong to the tectosilicates, sometimes referred also as network silicates. Their structure is based on three dimensional network of SiO4 tetrahedrons which are partially replaced by AlO4tetrahedrons. Feldspars form monoclinic or triclinic crystals. They are divided into groups of the disordered (high) and the ordered (lo…
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K-feldspar Decomposition: K-feldspar is a common mineral found in igneous and metamorphic rocks. It is a silicate mineral with the chemical formula KAlSi3O8. ... A rapid heating rate can lead to the formation of different products compared to a slow heating rate. The decomposition process is also influenced by the presence of other minerals and ...
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Over-etching results in loss of detail, and we recommend starting with short etching times of ~10 s. Albite lamellae usually etch more slowly than K-feldspar, and the resulting relief …
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The K/Cs ratio of the synthetic K-feldspar was compared to modeled K/Cs ratios for K-feldspars formed from a water-saturated melt in which the initial Cs concentration (Co) of the melt was ...
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a significant role in the K isotopic behavior of K-feldspar. The correlations of δ41K with SiO 2 and Al 2 O 3 contents are attributed to the difference in K-O bond strengths. Compared to K-feldspar, the K content could be a better proxy for constraining the δ 41K of plagioclase. Our results demonstrate that the δK of
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K-feldspar grains can emit luminescence signals when they are stimulated by infrared at wavelengths around 800-900 nm (Bøtter-Jensen et al., 2003), which is termed Guo-Qiang Li et al. as IRSL. There are three advantages for IRSL dating from K …
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OSL dating are quartz and K-feldspar. Compared with . quartz, the infra-red stimulated luminescence (IRSL) signal of K-feldspar has se veral adva ntages, such a s high .
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ID Species Reference Link Year Locality Pressure (GPa) Temp (K) 0000887: Hyalophane: Viswanathan K, Kielhorn H M (1983) Al,Si distribution in a ternary (Ba,K,Na)-feldspar as determined by crystal structure refinement Celsian-rich American Mineralogist 68 122-124 1983: Yugoslavia: 0: 293: 0009608: Hyalophane
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Besides the slower decay rate of the K-feldspar IRSL signal compared to quartz OSL signals (Godfrey-Smith et al., 1988), K-feldspar has unbleachable signals even after a very long exposure to sunlight; they are termed "residual signals" and are equivalent to "residual doses" (Buylaert et al., 2011).
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new K-feldspar parameterization is compared to the litera-ture data (Fig. 7d) it represents the variability of K-feldspar, as well as the curvature in the datasets. In particular, the.
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K-feldspar is a common mineral in numerous clastic rocks and is a significant component of sediments. Compared to the widely used detrital zircon, the K-feldspar grains are more likely to preserve a first-cycle signal that is derived directly from the source (Tyrrell et al., ...
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