Mantle(?) xenoliths in the carbonatites of northern Transbaikalia

The composition and nature of high-Cr minerals in lithic clasts from the carbonatites of the Veseloe occurrence, northern Transbaikalia, were considered. In order to determine their source, the Cr-bearing phases were compared with chromite, magnetite, and rutile from ultrabasic rocks, mantle xenoliths, and eclogites. It was suggested that the xenoclasts studied were formed at great depths, whereas the carbonatites were directly derived from the mantle rather than formed by the crustal differentiation of a silicate-carbonate melt.     

Stratigraphie und Fazies des Erzgebirgischen Kristallins im Rahmen des Mitteleuropäischen Varistikums

Zusammenfassung Es läßt sich zeigen, daß im erzgebirgischen Raum die jungalgonkische Serie des varistischen Sockels von der Petrofazies diskordant geschnitten wird. Im Bereich des erzgebirgischen Kristallins steigt die Amphibolitfazies beulenförmig bis an die Basis des varistischen Sedimenttroges auf. Mit diesem Aufstieg wird eine Granitbildung regionalen und lokalen Charakters als möglich in Verbindung gebracht.

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It can be demonstrated that the Upper Algonkian rocks of the Hercynian basement are disconformably cut by the petrofacies of the Erzgebirge. In the environment of crystallin rocks amphibolitic facies ascend to the bottom of the hercynian sedimentary trough. With this rise a granitisation of regional and locally restricted character might seem to be possible.

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Résumé On peut montrer que dans la région de l'Erzgebirge les couches de l'Algonkien supérieur du socle hercynien sont recoupées en discordance par le petrofacies. Dans le domaine du cristallin de l'Erzgebirge, le facies amphibolite a la forme d'un dûme atteignant la base de la fosse sédimentaire varisque. On croit pouvoir établir une relation entre la formation de granite à l'échelle régionale et locale et cette montée métamorphique.

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Herrn Prof. Dr. Dr. h. c.Erich Bederke zum 70. Geburtstag gewidmet.     

Dynamical attitude model for Gaia

The Dynamical Attitude Model (DAM) is a simulation package developed to achieve a detailed understanding of the Gaia spacecraft attitude. It takes into account external physical effects and considers internal hardware components controlling the satellite. The main goal of the Gaia mission is to obtain extremely accurate astrometry, and this necessitates a good knowledge of Gaia’s behaviour as a spinning rigid body under the influence of various perturbations. This paper describes these perturbations and how they are modelled in DAM.     

Linear mechanism of generation and intencification of internal gravity waves in the ionosphere at their interaction with a nonuniform zonal wind: 1. Model of the medium and initial dynamic equations

The specific features of the generation and intensification of internal gravity wave structures in different atmospheric-ionospheric regions, caused by zonal local nonuniform winds (shear flows), are studied. The model of the medium has been explained and an initial closed system of equations has been obtained in order to study the linear and nonlinear dynamics of internal gravity waves (IGWs) when they interact with the geomagnetic field in a dissipative ionosphere (for the D, E, and F regions).     

Photoelectric device for monitoring the movement of a torsion balance beam

Manufactured and tested in his work is a photoelectric device that makes it possible to automatically determine the relative angular position of the beam of a miniature torsion balance, angular readings being discretized with various time step values and stored in a computer. Measurements were taken with this device that captured the occurrence of the partial solar eclipse on September 11, 2007, and confirmed the fact, established previously through visual observation, that the position of torsion balance beams changed at the instant an eclipse took place.     

The structure of benthic communities in an area of thermal discharge from a coastal power station

The area of sea subjected to heated effluent discharged from the power station at Piombino is very suitable for the study of problems connected with thermal pollution of the nearshore environment. Construction of the power station is planned to go ahead by successive operational stages, producing correspondingly increased amounts of heat discharged into the marine environment. At present it produces 640 MW and discharges 190 Mcal s^?1 into the sea.This paper studies the benthic communities after the power station had been operating for about 1 yr. Comparison of these data with those about subsequent operational stages will presumably allow to establish to what extent the environment can receive, without damage, increasing amounts of heat.