Investigation of the hydrothermally altered K-feldspar use in slag

This paper explores the use of nano-structured, hydrothermally altered K-feldspar, known as a multi-phase material (MPM), as a precursor in alkali-activated systems based on ground …

WhatsApp: +86 18221755073

The ice-nucleating ability of quartz immersed in water and its

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.

WhatsApp: +86 18221755073

Comparison of Equivalent Doses Obtained with Various post-IR …

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 .

WhatsApp: +86 18221755073

K isotopic fractionation in K-feldspar: Effects of mineral chemistry

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 ...

WhatsApp: +86 18221755073

Albany K-Feldspar: A New Pb Isotope Reference Material

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 ...

WhatsApp: +86 18221755073

Bleachability of pIRIR signal from single-grain K-feldspar

The calculated K-feldspar ages (IRSL and pIRIR) were then compared with quartz-SAR and two independent radiocarbon ages.The ages of the investigated sediments range from the late Pleistocene (∼ ...

WhatsApp: +86 18221755073

Pb isotopic zoning of K-feldspar megacrysts determined by Laser

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 ...

WhatsApp: +86 18221755073

Rb enrichment processes in highly evolved granites: Insights from …

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.

WhatsApp: +86 18221755073

Fractional crystallization of high-K arc magmas: biotite- versus

Biotite and K-feldspar fractionation in the alkaline arc series results in the moderation of K 2 O/Na 2 O values and LILE concentrations with increasing SiO 2 as compared to the more common calc-alkaline series characterized by amphibole and plagioclase crystallization and strong increases in K 2 O/Na 2 O values. Lastly, we suggest that common ...

WhatsApp: +86 18221755073

K isotopic fractionation in K-feldspar: Effects of mineral …

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

WhatsApp: +86 18221755073

K-feldspar – H2 interaction in the context ofunderground hydrogen

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.

WhatsApp: +86 18221755073

K-feldspar

K-feldspar, Quartz and Biotite in a Granite. This view shows two large flakes of brownish green biotite and minor hornblende (darker smaller grains) near the left edge; the hornblende does not have a distinctive appearance. The biotite has a pebbly texture and micaceous cleavage.The right half of the view contains a large grain of clear to cloudy K-feldspar.

WhatsApp: +86 18221755073

Thermodegradation Modeling in Simplified K-Feldspar Systems

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 ...

WhatsApp: +86 18221755073

(PDF) ORIGIN OF K-FELDSPAR MEGACRYSTS IN PHULAD …

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 ...

WhatsApp: +86 18221755073

The ice-nucleating ability of quartz immersed in water and its

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 …

WhatsApp: +86 18221755073

Review of the Post-IR IRSL Dating Protocols of K-Feldspar

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 ...

WhatsApp: +86 18221755073

Selective flotation of K-feldspar from Na-feldspar in alkaline

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 …

WhatsApp: +86 18221755073

COMPARISON OF EQUIVALENT DOSES OBTAINED WITH …

Compared with quartz, the infra-red stimulated luminescence (IRSL) signal of K-feldspar has several advantages, such as high signal intensity, high internal dose rate, late saturation and …

WhatsApp: +86 18221755073

(PDF) Comparison of three K-feldspar luminescence dating …

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 …

WhatsApp: +86 18221755073

Field calibration of 40Ar/39Ar K-feldspar multiple diffusion domain

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).

WhatsApp: +86 18221755073

Routine characterization and interpretation of complex alkali …

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 …

WhatsApp: +86 18221755073

K isotopic fractionation in K-feldspar: Effects of mineral …

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 …

WhatsApp: +86 18221755073

Mechanistic understanding of Curium(III) sorption on natural K-feldspar

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).

WhatsApp: +86 18221755073

Genesis of hydrothermal K-feldspar (adularia) in an active …

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 ...

WhatsApp: +86 18221755073

Feldspars

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…

WhatsApp: +86 18221755073

K-Ar geochronology for hydrothermal K-feldspar within …

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).

WhatsApp: +86 18221755073

Rounding of Quartz and K-Feldspar Sand From Beach to Dune …

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 …

WhatsApp: +86 18221755073

Deep-time thermal history of the Great Unconformity in the Grand …

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.

WhatsApp: +86 18221755073

Review of the Post-IR IRSL Dating Protocols of K-Feldspar

Compared to quartz, the infrared stimulated luminescence (IRSL) of K-feldspar saturates at higher dose, which has great potential for extending the dating limit.

WhatsApp: +86 18221755073

Rheology of dry K-feldspar aggregates at high temperature and …

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 ...

WhatsApp: +86 18221755073