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Temperature and isotopic relations in the Middle Miocene sandstones from the Ukrainian Carpathian Foredeep Basin - a reconnaissance study

Jarmołowicz-Szulc K., Kozłowska A., Kuberska M.

Annales Societatis Geologorum Poloniae

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2011

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Vol. 81, No 1

79-86

EN

Studies of the Middle Miocene sandstones in selected wells from the western Ukraine concerned calcite cements, both from isotopic and fluid inclusion aspects. The aim of the reconnaissance study was to find out inclusion – isotopic constraints for the calcite cements in the sandstones. The studied sandstones are subarkosic, sporadically sublithic arenites. The delta1318

2

Wybrane zagadnienia napędu hydraulicznego z multiplikacją ciśnienia

Tomasiak E., Barbachowski E.

Hydraulika i Pneumatyka

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2008

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nr 4

5-8

PL

Wskazano na zależność rozwoju nowych technologii zasilania pojazdów samochodowych od zastosowania małogabarytowych butli gazowych dla ciśnień użytkowych 70 MPa i więcej. Podkreślono, że sterowanie procesem badań wymusza stosowanie techniki proporcjonalnej w napędzie multiplikatora, a siłownik multiplikacji ciśnienia wymaga odpowiednich uszczelnień i szczególnej ich zabudowy.

EN

The relation between development of new vehicles fueled technologies and using of small size gas cylinder for nominal pressure 70 MPa and more has been mentioned. Control of experimental research requires proportional valves in the pressure multiplication system. Pressure multiplication cylinder needs an adequate seals and specially mounting of seals.

3

Hydrothermal veins linked with the Variscan structure of the Prague Synform (Barrandien, Czech Republic): resolving fluid-wall rock interaction

Halavínová M., Melichar R., Slobodník M.

Geological Quarterly

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2008

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Vol. 52, No 4

309-309

EN

Variscan syntectonic hy dro ther mal veins of the Prague Synform are important traces of small-scale fluid migration in Lower Palaeozoic sedimentary rocks — a process induced by late Variscan tectogenesis. Two main structural types of Variscan syntectonic calcite veins were recognised during fieldwork. Veins of Type I have an irregular or sigmoidal shape and are often arranged in en echelon arrays. A shearing regime during the formation of this type is deduced. Veins of a second structural type (Type II) have a more regular and straight shape relative to those of Type I and in some places form a dense network. The structural position of the Type II veins is related to structural elements of Variscan folds. Veins were formed due to interlayer-slip combined with fold- related fracturing that gave rise to the infilling of dilational structures. A tensional regime also permits growth of the fibrous veins. Two princpal directions were distinguished within the Type II veins. The first one is NNW–SSE and the second one shows a perpendicular ENE–WSW orientation. These directions seem to be parallel and/or perpendicular to the nappearchitec ture of the Prague Synform. Variscan syntectonic veins crystallised in a relatively closed, rock-buf fered system. Extraction of chemical components from surrounding rocks is indicated by a combined microprobe/cathodoluminescent study and by isotope geochemistry. The carbon isotope values of hydrothermal calcites reflect the carbon isotope composition of the host rocks. The delta exp.13C values of vein calcites and their host Silurian rocks are between –0.29 and –1.98‰ PDB. The same relationships were found between the veins and the host Devonian limestones (from 1.72 to 2.52‰ PDB). Samples close to the Silurian/Devonian boundary show transition values between 0.25 and + 1.16‰ PDB. The Sr-isotopic signature supports a genetic link between the calcite veins and the host rocks. The 87Sr/86Sr ra tio in calcites ranges between 0.708619 and 0.708738 and in wall rocks be tween 0.708755 and 0.709355. Aqueous and hydrocarbon-rich fluid systems have been found in fluid inclusions. Liquid hydrocarbons show mostly a light blue fluorescence suggesting the presence of higher hydrocarbons. They are more abundant in dark Silurian rocks, which are rich in organic matter. Lower salinities (0.5–8.9 eq. wt.% NaCl) and homogenization temperatures with a maximum around 140gradeC are typ i cal for the aqueous (H2O–NaCl) system. The oxygen isotopic composition of fluids ranges between –2.80 and +3.33‰ SMOW. This indicates that transformed formation waters in teracted with the host rocks and/or deeply circulating isotopically depleted meteoric waters. Intersections with the isochore specify border trapping temperatures between 127 and 160grade C and pressures from 300 to 1070 bars.

4

Fizyko-chemiczne mechanizmy uszkodzeń układu przepływowego pomp. Częsć 1Korozja

Koziej A.

Pompy, Pompownie

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2007

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nr 1 (124)

42-45

PL

Omówienie zjawiska korozji, mechanizmów i form uszkodzeń korozyjnych – korozji wżerowej, równomiernej, selektywnej, międzykrystalicznej i mikrobiologicznej.

EN

Description and classification of corrosion in forms, like pitting, crevices, intercrystalline stress and other forms of corrosion.