A pot experiment was conducted with kiwifruit planting soil to evaluate the impacts of potassium solubilizing bacteria (KSB) and K-feldspar on the soil nutrient levels, enzyme activities, and microecological environment. The effects were investigated of three inoculation treatments (T1: K-feldspar, …
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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 reaction process of K-feldspar and Ca(OH)2 was discussed by comparing the reaction between K-feldspar bulk and Ca(OH)2 solution with the reaction between K-feldspar and lime (CaO) powders.
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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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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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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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In this study, K-feldspar (KAlSi 3 O 8) was taken as the raw material, using KOH and CaO as additives to enhance the decomposition of K-feldspar under hydrothermal conditions to release potassium and aluminum, and simultaneously transformed the silicon component into calcium …
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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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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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Small pieces of albite in K-feldspar are called perthite, the reverse is antiperthite. By comparison, K-feldspars mix very well with Ba-feldspars. The ternary plot of possible feldspar compositions. The small black labels are old (and discouraged) feldspar names, the % shows the content of albite component (so basically the content of Na in ...
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The K-feldspar was selectively floated from Na-feldspar at pH 10.5–11.6 with NaOH as pH adjuster/modifier and Brij58 as frother, but without any additional collector other than the …
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Abstract. The relation between the mineralogical characteristics of size-selected feldspar particles from 50 to 800 nm and their ability to act as ice-nucleating particles (INPs) in the immersion mode is presented. Five polymorph members of K-feldspar (two microclines, orthoclase, adularia and sanidine) and four plagioclase samples (three labradorites and a …
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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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However, compared with quartz and plagioclase, the rheology of K-feldspar (Kfs) is much less characterized. We present here systematic axial compression deformation experiments on a relatively dry (22 ± 2 wt ppm) synthetic Kfs aggregates (Or 81 Ab 19 ) at strain rates of 10 −4 –10 −5 s −1, temperatures of 950–1100 °C and a pressure ...
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When compared to other rocks from the TMP, the Pb isotopic composition of the K-feldspar megacrysts overlaps with the volcanic district of Tolfa-Manziana (southernmost outcrop of the TMP; Pinarelli, 1991) and the rhyolitic volcanic centres of San Vincenzo and Roccastrada (Fig. 1; Vollmer, 1977) and has similar 208 Pb/ 204 Pb to lamproitic rocks ...
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1 1 The ice-nucleating ability of quartz immersed in water and its 2 atmospheric importance compared to K-feldspar 3 4 Alexander D. Harrison1, Katherine Lever1, Alberto Sanchez-Marroquin1, Mark A. Holden1,2*, 5 Thomas F. Whale1,2, Mark D. Tarn1,3, James B. McQuaid1 and Benjamin J. Murray1 6 1School of Earth and Environment, University of Leeds, Leeds, …
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The 0.5 m.y. age difference and the similarities with whole-rock zircon ages from the pHD and CP units as well as the trace-element characteristics compared to those in the groundmass zircons indicate growth of the K-feldspar into its megacrystic size by growth in different, interacting magma bodies, rather than through fast growth or in situ ...
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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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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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1 1 The ice-nucleating ability of quartz immersed in water and its 2 atmospheric importance compared to K -feldspar 3 4 Alexander D. Harrison 1, Katherine Lever 1, Alberto Sanchez -Marroqu in1, Mark A. Holden 1,2*, 5 Thomas F. Whale 1,2, Mark D. Tarn 1, James B. McQuaid 1 and Benjamin J. Murray 1 6 1School of Earth and Environment, University of Leeds, Leeds, …
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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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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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This has previously been shown to be an issue for comparing natural Kspar-mica K isotope fractionation (Huang et al., 2023) compared with theoretical DFT calculations (Li et al., 2019), where Huang et al. (2023) found a larger isotope fractionation factor between natural mica and feldspar than predicted by DFT. The discrepancy was attributed to ...
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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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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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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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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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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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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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