Distribution of elements among minerals of a single (muscovite-) biotite granite sample – an optimal approach and general implications

Janoušek, Vojtěch; Navrátil, Tomáš; Trubač, Jakub; Strnad, Ladislav; Laufek, František; Minařík, Luděk

doi:10.2478/geoca-2014-0017

Cited by 10 publications

(3 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The data reduction included the correction for the gas blank, the internal standard and a calibration check, and the data were processed off line in an MS Excel spreadsheet-based program (Zachariáš and Wilkinson 2007). Similar analytical protocol and correction strategy have been used by Strnad et al (2005) and Janoušek et al (2014).…”

Section: La-icp-msmentioning

confidence: 99%

Trace-element chemistry of barren and ore-bearing quartz of selected Au, Au-Ag and Sb-Au deposits from the Bohemian Massif

Pacák¹,

Zachariáš²,

Strnad³

2019

Jour. Geosci.

View full text Add to dashboard Cite

The trace-element contents in gold-bearing and barren quartz veins from eight Au, Au-Ag and Sb-Au Variscan deposits in the Bohemian Massif have been determined in situ in order to evaluate the differences between the various types of gold deposits and discuss trace-element variations in the successive generations of quartz veins. The variability of Ti, Al, Ge, Li and Sb abundances obtained by Laser-Ablation Inductively-Coupled Plasma Mass Spectrometry (LA-ICP-MS) roughly correlates with the origin and the temperature of the mineralizing fluids. The Al content ranges up to 4020 ppm (median value 230 ppm), while the Li content is generally low (< 4 ppm). The elevated Sb content (30-360 ppm Sb) is only related to quartz that immediately preceded deposition of Sb-rich phases. The titanium content of the ore-bearing vein quartz follows bimodal distribution: gold deposits with assumed higher temperature (> 450 °C) formation exhibit higher median values (~10 ppm Ti) than medium-to-low (< 300 °C) temperature deposits (~2 ppm Ti). A statistically significant threshold value (8 ppm Ti) has been recognized as an empirical tool for discriminating between them. In terms of the Ti and Al contents, the studied Bohemian gold deposits fall within and in between fields of orogenic gold and porphyry deposit types.

show abstract

Section: La-icp-msmentioning

confidence: 99%

Trace-element chemistry of barren and ore-bearing quartz of selected Au, Au-Ag and Sb-Au deposits from the Bohemian Massif

Pacák¹,

Zachariáš²,

Strnad³

2019

Jour. Geosci.

View full text Add to dashboard Cite

show abstract

“…Or, worse still, it is imprecise or misleading, due to the presence of phenocrysts, fabric, problems with identification of colourless minerals etc. (Janoušek et al 2014). Accordingly, the quantitative modal analyses of the granitoids are seldom reported in recent literature; for example, only about 5 % of the data in the igneous rock database in western North America (NAVDAT) reported its actual mineral contents (Glazner et al 2019a, b).…”

Section: Introductionmentioning

confidence: 99%

The 2Q-(Or + Ab)-4An (QUORAA) diagram: poor for classification but good at deciphering the evolution of granitoids

Sun,

Wang

2024

J. Geosci.

View full text Add to dashboard Cite

The 2Q-(Or + Ab)-4An (QUORAA) diagram (Enrique 2018) is proposed as an approximation of the modal QAP naming scheme for silica-saturated plutonic rocks. However, whether this scheme can reasonably reproduce the modal QAP classification results still needs to be tested. Through the inspection based on a dataset of 955 pairs of the mineral mode and whole-rock chemical compositions from the literature, it was found that the ratio of consistency between the two schemes is only 63.56 %. The consistency ratio is higher for discrimination of the granites (s.s.), but the inconsistency increases significantly for the rocks containing more mafic minerals (M > 25 %). As a section of the An-Ab-Or-Q (haplogranodiorite) tetrahedron, the QUORAA diagram is very helpful to illustrate the evolutionary paths of granitoid melts. The typical arc-related (ACG + ATG), the collision-related peraluminous (CPG + MPG), the rift-related peralkaline (PAG) as well as the potassic KCG granitoids show different trajectories in the QUORAA diagram. It is concluded that the QUORAA diagram would be applicable as a petrogenetic tool rather than the classification scheme.

show abstract

“…Lesní potok is one of 14 catchments in the Czech GEOMON network (Oulehle et al, 2021) and thus has been part of several cross-site comparisons (Bohdalkova et al, 2014;Fottov a & Skorepov a, 1998;Nov ak et al, 2005Nov ak et al, , 2010Oulehle et al, 2008Oulehle et al, , 2017Oulehle et al, , 2021. The catchment is well-characterized in terms of its physical properties (soils, geology, vegetation, hydrology;Janoušek et al, 2014;Navr atil et al, 2003). Lesní potok was the site of studies on beryllium cycling (Navr atil et al, 2002;Skrivan et al, 1993), lead geochemistry (Navr atil et al, 2004), manganese cycling (Navr atil et al, 2007), rare earth elements in vegetation (Špičkov a et al, 2010) and Hg in soils (Navr atil et al, 2014) and stream water (Navr atil et al, 2015).…”

mentioning

confidence: 99%

Mercury cycling during acid rain recovery at the forested Lesní potok catchment, Czech Republic

Navrátil

Shanley

Rohovec

et al. 2021

Hydrological Processes

Self Cite

View full text Add to dashboard Cite

From 2011 to 2019, mercury (Hg) stores and fluxes were studied in the small forested catchment Lesní potok (LES) in the central Czech Republic using the watershed mass balance approach together with internal measurements. Mean input fluxes of Hg via open bulk deposition, beech throughfall and spruce throughfall during the periodwere 2.9, 3.9 and 7.6 μg m−2 year−1, respectively. These values were considerably lower than corresponding deposition Hg fluxes reported in the early years of the 21st century from catchments in Germany. Current bulk precipitation inputs at unimpacted Czech mountainous sites were lower than those in Germany. The largest Hg inputs to the catchment were via litterfall, averaging 22.6 and 17.8 μg m−2 year−1 for beech and spruce stands. The average Hg input, based on the sum of mean litterfall and throughfall deposition, was 23.0 μg m−2 year−1, compared to the estimated Hg output in runoff of 0.5 μg m−2 year−1, which is low compared to other reported values. Thus, only ~2% of Hg input is exported in stream runoff. Stream water Hg was only weakly related to dissolved organic carbon (DOC) but both concentrations were positively correlated with water temperature. The estimated total soil Hg pool averaged 47.5 mg m−2, only 4% of which was in the O‐horizon. Thus Hg in the O‐horizon pool represents 72 years of deposition at the current input flux and 3800 years of export at the current runoff flux. Age‐dating by 14C suggested that organic soil contains Hg from recent deposition, while mineral soil at 40–80 cm depth contained 4400‐year old carbon, suggesting the soil had accumulated atmospheric Hg inputs through millennia to reach the highest soil Hg pool of the soil profile. These findings suggest that industrial era intensification of the Hg cycle is superimposed on a slower‐paced Hg cycle during most of the Holocene.

show abstract

Distribution of elements among minerals of a single (muscovite-) biotite granite sample – an optimal approach and general implications

Cited by 10 publications

References 57 publications

Trace-element chemistry of barren and ore-bearing quartz of selected Au, Au-Ag and Sb-Au deposits from the Bohemian Massif

Trace-element chemistry of barren and ore-bearing quartz of selected Au, Au-Ag and Sb-Au deposits from the Bohemian Massif

The 2Q-(Or + Ab)-4An (QUORAA) diagram: poor for classification but good at deciphering the evolution of granitoids

Mercury cycling during acid rain recovery at the forested Lesní potok catchment, Czech Republic

Contact Info

Product

Resources

About