Trace element composition in olivine from the 2022 Meradalir eruption of the Fagradalsfjall Fires, SW-Iceland (Short Communication)

This study focuses on determining the trace element composition in olivine from olivine tholeiitic basalts sampled in Iceland during the 2022 Meradalir eruption of the 2021-ongoing Fagradalsfjall Fires. The chemistry of Meradalir olivine is characteristic for a volcanic origin where olivine crystals represent the product of crystallisation. Olivine from the Meradalir basalt magma falls within the field characteristic for the melting of a dominantly peridotitic mantle source. However, the data show that the 2022 Meradalir olivine crystalized from a compositionally more evolved magma than olivine from the preceding 2021 Geldingadalir eruption of the Fagradalsfjall Fires

Phlogopite/matrix, Cpx/matrix and Cpx/phlogopite trace element partitioning in true lamprophyres

This contribution summarizes the results of pilot determination of distribution coefficients for various trace elements between the phlogopite, clinopyroxene and surrounding matrix of calc-alkaline lamprophyres. Partition coefficients were determined using the method of laser ablation in conjunction with inductively coupled plasma-mass spektrometry (LA-ICP-MS).Příspěvek shrnuje výsledky pilotního stanovení rozdělovacích koeficientů pro jednotlivé stopové prvky mezi flogopitem, klinopyroxenem a okolní matrix vápenato-alkalických lamprofyrů. Rozdělovací koeficienty byly určeny s využitím metody laserové ablace ve spojení s hmotnostní spektrometrií indukčně vázaného plazmatu (LA-ICP-MS).This contribution summarizes the results of pilot determination of distribution coefficients for various trace elements between the phlogopite, clinopyroxene and surrounding matrix of calc-alkaline lamprophyres. Partition coefficients were determined using the method of laser ablation in conjunction with inductively coupled plasma-mass spektrometry (LA-ICP-MS)

The transition from granite to banded aplite-pegmatite sheet complexes: An example from Megiliggar rocks, Tregonning topaz granite, Cornwall

This is the author accepted manuscript. The final version is available from Elsevier via the DOI in this record.The genetic relationship between a granite pluton and adjacent complex of rare-metal pegmatite-aplite-banded sheets (Megiliggar Sheet Complex - MSC) has been studied at the border of the Tregonning topaz granite at Megiliggar Rocks, Cornwall, SW England. Similarities in whole-rock chemical and mineralogical compositions, together with a gradual change in textures away from the granite margin, provide strong evidence for a genetic link between the Tregonning Granite and MSC. The sheets are likely to represent apophyses of residual melt which escaped from the largely crystallised roof of the granite pluton. The escaping melt was peraluminous, had a composition near the F, B, Li slightly enriched granite minimum, and, in comparison with other Cornish granites, was enriched in F, Li, Rb, Cs, Sn, W, Nb, Ta, and U, and depleted in Fe, Mg, Ca, Sr, Th, Zr, and REE. With increasing distance from the Tregonning Granite, the silicate melt crystallised as homogeneous leucogranite sheets and banded complex sheets (i.e. combinations of bands with granitic, aplitic and pegmatitic textures), then layered aplite-pegmatites; this sequence becoming progressively more depleted in the fluxing and volatile elements F, Li, Rb, and Cs, but showing no change in Zr/Hf ratios. The fixed Zr/Hf ratio is interpreted as indicating a direct genetic link (parental melt) between all rock types, however the melt progressively lost fluxing and volatile elements with distance from the granite pluton, probably due to wall-rock reaction or fluid exsolution and migration via fractures. Differentiation of the primary melt into Na-Li-F-rich and separate K-B-rich domains was the dominant chemical process responsible for the textural and mineral diversity of the MSC. On a large (cliff-section) scale, the proximal Na-Li-F-rich leucogranite passes through complex sheets into K-B-rich aplite-pegmatites, whilst at a smaller (< 1 m) scale, the K-B-rich bands are interspersed (largely overlain) by Na-Li-F-rich segregations. The grain size differences between the aplite and pegmatite could be related to pressure fluctuations and/or undercooling.Laser-ablation ICP-MS analyses of micas and tourmaline in Masaryk University Brno were supported by the Czech Science Foundation project No. GA14-13600S. All other analytical work for this contribution was supported by the RVO 67985831 in the Institute of Geology of the Czech Academy of Sciences, Praha. We are grateful to P. Davidson and an anonymous referee for their reviews

Supported employment in the region of Litoměřice

This thesis is aimed at the policy of employment of disabled people and at supported employment in the region of Litoměřice. The basic question of the theoretical part is what contemporary policy of empolyment of disabled people in the Czech Republic is (and partly in the European Union), whether the quantity and quality of the legislative regulations connected with this problems is sufficient and satisfactory and whether the launching of these regulations to the practice is effective and useful for disabled people. The thesis also explores the possibilities of disabled people in the Czech Republic to find and keep employment and difficulties connected with it. The thesis also analyses a part of supported employment at solving the question of employment od disabled people. The practical part surveys the role and position of supported employment in the region of Litoměřice. The thesis designates two aims. The first one is to contribute to creation of complete view of employement of disabled people and to introduce supported employment as one of the possibilities how to solve the problems of employment of these people. The second aim is to make a detailed probe into supported eployment in the region of Litoměřice which is provided by Supported Employment Agency by the Diákony of the Evangelical Church..