Petrophysical and geochemical constraints on alteration processes in granites

Machek, Matěj; Roxerová, Zuzana; Janoušek, Vojtěch; Staněk, Martin; Petrovský, Eduard; René, Miloš

doi:10.1007/s11200-013-0923-6

Cited by 7 publications

(8 citation statements)

References 64 publications

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“…Fluorapatite, triplite, Nb-Ta-Ti oxides, zircon, xenotime-(Y), monazite-(Ce), and very rare Nb-bearing wolframite are accessories. The alkali-feldspar syenite is described as feldspathite in some papers (e.g., [16,17]), but this name does not agree with the magmatic nature of this rock, which is in some places underlined by its striking magmatic layering (Figure 3). …”

Section: Petrographymentioning

confidence: 99%

“…The inner structure of the south-eastern edge of the KGB, partly overlain by metamorphic rocks of the Slavkov crystalline unit, is well stratified, comprising variable greisenised high-F, high-P2O5 Li-mica granites occurring also in the Hub, and Schnöd greisen Figure 1. Schematic geological map of the Krudum granite body modified after [17].…”

Section: Geological Settingmentioning

confidence: 99%

“…The youngest, high-F, high-P 2 O 5 Li-mica granite forms the outermost shell [17]. The inner structure of the south-eastern edge of the KGB, partly overlain by metamorphic rocks of the Slavkov crystalline unit, is well stratified, comprising variable greisenised high-F, high-P 2 O 5 Li-mica granites occurring also in the Hub, and Schnöd greisen stocks hosting the world-famous Sn-W-Nb-Ta-Li mineralization of the Horní Slavkov-Krásno ore district [18][19][20][21][22] (Figure 2).…”

Section: Geological Settingmentioning

confidence: 99%

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REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

René

2018

Minerals

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Abstract:The Krudum granite body comprises highly fractionated granitic rocks ranging from medium-F biotite granites to high-F, high-P 2 O 5 Li-mica granites. This unique assemblage is an ideal site to continue recent efforts in petrology to characterize the role of zircon, monazite, and xenotime as hosts to rare earth elements (REEs). The granitic rocks of the Krudum body analyzed in this study were found to contain variable concentrations of monazite and zircon, while xenotime was only found in the high-F, high-P 2 O 5 Li-mica granites and in the alkali-feldspar syenites of the Vysoký Kámen stock. Intermediate trends between cheralite and huttonite substitutions are characteristic for analyzed monazite grains from all magmatic suites. The highest concentration of cheralite was found in monazite from the alkali-feldspar syenites (up to 69.3 mol %). The proportion of YPO 4 in analyzed xenotime grains ranges from 71 to 84 mol %. Xenotime grains are commonly enriched in heavy rare earth elements (HREEs; 9.3-19.5 wt % HREE 2 O 3 ) and thorite-coffinite and cheralite exchange was observed. Some xenotime analyses return low totals, suggesting their hydration during post-magmatic alterations. Analyzed zircon from granite suites of the Krudum granite body contains moderate Hf concentrations (1.0-4.7 wt % HfO 2 ; 0.010-0.047 apfu Hf). The highest concentrations of HfO 2 were found in zircon from the high-F, high-P 2 O 5 Li-mica granites (1.2-4.7 wt % HfO 2 ). Analyzed zircon grains from the high-F, high-P 2 O 5 Li-mica granites and alkali-feldspar syenites are enriched in P (up to 8.29 wt % P 2 O 5 ; 0.24 apfu P), Al (0.02-2.0 wt % Al 2 O 3 ; 0.00-0.08 apfu Al), Ca (up to 3.9 wt % CaO; 0.14 apfu Ca), Y (up to 5.5 wt % Y 2 O 3 ; 0.10 apfu Y), and Sc (up to 1.17 wt % Sc 2 O 3 ; 0.03 apfu Sc). Zircon grains from the high-F, high-P 2 O 5 Li-mica granites were sometimes hydrated and fluorized. The concentrations of F in zircon from partly greisenised high-F, high-P 2 O 5 Li-mica granites reached up to 1.2 wt % (0.26 apfu F).

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Section: Petrographymentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

René

2018

Minerals

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“…area (Figure 1). The Krudum granite body is part of the Western Erzgebirge pluton [16][17][18][19][20]. The inner structure of the granite stocks in the Krásno-Horní Slavkov ore district is remarkably stratiied, comprising greisens, weakly greisenised topaz alkali-feldspar granites, and layers of alkali-feldspar syenites (Figure 2).…”

Section: Geological Setingmentioning

confidence: 99%

Petrology, Geochemistry and Mineralogy of Greisens Associated with Tin-Tungsten Mineralisation: Hub Stock Deposit at Krásno–Horní Slavkov Ore District, Czech Republic

René¹

2018

Contributions to Mineralization

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The greisens evolved in the apical part of the Hub stock, formed by weakly greisenised topaz granites, are predominantly represented by Li-mica-topaz and topaz-Li-mica greisens. These greisens, relative to weakly greisenised topaz granites, are enriched in Ca, F, Fe, Li, Si, Sn and W and depleted in Al, K, Mg, Na, Ti, Y, Zr and ΣREE. Weakly greisenised topaz granites show convex tetrads in the normalised REE paterns. Compared to topaz granites, the greisens display lower ΣREE concentrations, partly higher negative Eu anomaly, high Y/Ho and low Zr/Hf ratios. Li-micas occurring in greisens are represented by zinnwaldite. Chemical composition of cassiterite is near to ideal SnO 2 (>99 wt.% SnO 2 ). The wolframite is represented by manganoan ferberite.

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“…Mielke et al, 2017;Weinert et al, 2020a) as well as degree of alteration or weathering (e.g. Machek et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Database of petrophysical properties of the Mid-German Crystalline Rise

Weinert

Bär

Sass

2021

Earth Syst. Sci. Data

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Abstract. Petrophysical properties are a key element for reservoir characterization but also for interpreting the results of various geophysical exploration methods or geophysical well logs. Furthermore, petrophysical properties are commonly used to populate numerical models and are often critically governing the model results. Despite the common need for detailed petrophysical properties, data are still very scarce and often not available for the area of interest. Furthermore, both the online research for published property measurements or compilations, as well as dedicated measurement campaigns of the selected properties, which require comprehensive laboratory equipment, can be very time-consuming and costly. To date, most published research results are often focused on a limited selection of parameters only, and hence researching various petrophysical properties, needed to account for the thermal–hydraulic–mechanical behaviour of selected rock types or reservoir settings, can be very laborious. Since for deep geothermal energy in central Europe, the majority of the geothermal potential or resource is assigned to the crystalline basement, a comprehensive database of petrophysical properties comprising rock densities, porosity, rock matrix permeability, thermal properties (thermal conductivity and diffusivity, specific heat capacity) as well as rock mechanical properties as compressional and shear wave velocities, unconfined compressive strength, Young's modulus, Poisson's ratio, tensile strength and triaxial shear strength was compiled from measurements conducted at the HydroThermikum lab facilities of the Technical University of Darmstadt. Analysed samples were mostly derived from abandoned or active quarries and natural or artificial outcrops such as road cuts, riverbanks or steep hillslopes. Furthermore, samples of the cored deep wells Worms 3 (samples from 2175–2195 m), Stockstadt 33R (samples from 2245–2267 m), Weiterstadt 1 (samples from 2502–2504 m), Tiefbohrung Groß-Umstadt/Heubach, B/89–B02 and the cored shallow wells (Forschungsbohrung Messel GA 1 and 2) as well as GWM17 Zwingenberg, GWM1A Zwingenberg, Langenthal BK2/05, EWS267/1 Heubach, and archive samples of the Institut für Steinkonservierung e.V. in Mainz originating from a comprehensive large-scale sampling campaign in 2007 were investigated. The database (Weinert et al., 2020b; https://doi.org/10.25534/tudatalib-278) aims to provide easily accessible petrophysical properties of the Mid-German Crystalline Rise, measured on 224 locations in Bavaria, Hessen, Rhineland-Palatinate and Thuringia and comprising 26 951 single data points. Each data point is addressed with the respective metadata such as the sample identifier, sampling location, petrography and, if applicable, stratigraphy and sampling depth (in the case of well samples).

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Petrophysical and geochemical constraints on alteration processes in granites

Cited by 7 publications

References 64 publications

REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

Petrology, Geochemistry and Mineralogy of Greisens Associated with Tin-Tungsten Mineralisation: Hub Stock Deposit at Krásno–Horní Slavkov Ore District, Czech Republic

Database of petrophysical properties of the Mid-German Crystalline Rise

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