ДВОРЯНСЬКИЙ РІД БАНТИШІВ В ІСТОРІЇ КАТЕРИНОСЛАВЩИНИ

Встатті простежується історія молдавського боярського роду Бантиш від початкуXVIII ст. – до початкуХХ ст.The history ofMoldavian noble family Bantish from beginning XVIII c. to beginning XX c. is observed in this articl

Complexity of the anisotropy of magnetic susceptibility in single-phase deformed, low-grade, cleaved mudstone

The anisotropy of magnetic susceptibility (AMS) is often interpreted in terms of strain. However, since AMS is controlled by all magnetic (s.1.) carriers present, an AMS interpretation is not straightforward, especially in the presence of composite magnetic fabrics. Considering the large number of factors that may influence rock mineralogy (e.g. sediment source area, metamorphism), it becomes clear that one cannot interpret AMS in terms of strain without applying additional techniques that allow determining the nature and preferred orientation of all magnetic (s.1.) carriers likely influencing the measured AMS. This is discussed using samples from the Brabant Massif (Belgium) and the Moesian Platform (E-Romania).status: publishe

Fabric development and metamorphic evolution of lower Palaeozoic slaty rocks from the Rocroi massif (French-Belgian Ardennes): new constraints from magnetic fabrics, phyllosilicate preferred orientation and illite crystallinity data

This paper presents new results of a petrofabric study from Cambrian slates cropping out within the anchiepimetamorphic core of the Rocroi massif (Ardennes Variscan fold-thrust belt of northern France and southern Belgium). This study includes measurements of the Anisotropy of the Isothermal Remanent Magnetisation (AIRM) and the phyllosilicate preferred orientation. It completes the previous results of Anisotropy of Magnetic Susceptibility (AMS) and of magnetic mineralogy which were obtained in 47 sites situated in and around this massif. These new data allow the characterisation of the different subfabrics carried by the ferromagnetic minerals (metamorphic pyrrhotite and magnetite) and the paramagnetic matrix (Fe-rich phyllosilicates). Combined with some illite crystallinity data measured throughout the massif, the petrofabric measurements evidence a polyphase tectonometamorphic evolution. A major Variscan compressional event is evidenced inducing the growth of highly anisotropic pyrrhotite, coarse-grained hematite and phyllosilicates. By contrast, the magnetite grains display a less well-organised fabric due to the existence of an inherited orientation pattern. In agreement with recent metamorphic studies, it argues for an early diastathermal metamorphic event developed during a Devonian crustal-scale extension. (C) 1999 Elsevier Science B.V. All rights reserved.status: publishe

Conditions of meteoric calcite formation along a Variscan fault and their possible relation to climatic evolution during the Jurassic-Cretaceous

Two calcite cements, filling karst cavities and replacing Lower Carboniferous limestones at the Variscan Front Thrust, were precipitated after mid-Jurassic Cimmerian uplift and subsequent erosion but before late Cretaceous strike-slip movement. The first calcite (stage A) is nonferroan and crystals are coated by hematite and/or goethite. These minerals also occur as inclusions along growth zones. The calcite lattice contains < 0.07 mol.% Fe, but Mn concentrations can be as high as 0.72 mol.% in bright yellow luminescent zones. Primary, originally one-phase, all-liquid, aqueous inclusions have a final melting temperature between -0.2 degrees and +0.2 degrees C, indicating a meteoric origin of the ambient water. The delta(13)C and delta(18)O values of the calcites are between -7.3 parts per thousand, and -6.3 parts per thousand, -7.8 parts per thousand, and -5.5 parts per thousand on the Vienna PeeDee Belemnite (VPDB) scale, respectively. The second calcite (stage B) consists of ferroan (0.13-0.84 mol.% Fe) blocky crystals with Mn concentrations between 0.34 and 0.87 mol.%. Primary, single-phase aqueous fluid inclusions indicate precipitation from a meteoric fluid below 50 degrees C. The delta(13)C values of stage B calcites vary between -7.3 parts per thousand and -2.1 parts per thousand VPDB and the delta(18)O values between -7.9 parts per thousand and -7.2 parts per thousand VPDB. A precipitation temperature below 50 degrees C for the stage A calcites and the presence of iron oxide/hydroxide inclusions in the crystals indicate near-surface precipitation conditions. Within this setting, the geochemistry of the nonferroan stage A calcites reflects precipitation under oxic to suboxic conditions. The ferroan stage B calcites precipitated in a reducing environment. The evolution from the stage A to stage B calcites and the associated geochemical changes are interpreted to be related to the change from semiarid to humid conditions in western Europe during late Jurassic-Cretaceous times. A change in humidity can explain the evolution of groundwater from oxic/suboxic to reducing conditions during calcite precipitation. The typically higher delta(13)C values of the stage B compared to the stage A calcites can be explained by a smaller contribution of carbon derived from soil-zone processes than from carbonate dissolution in the groundwater under humid conditions. The small shift to lower delta(18)O between stage A and B calcites may be caused by a higher precipitation temperature or a decrease in the delta(18)O value of the meteoric water. This decrease could have been caused by a change in the source of the air masses or by an increase in the amount of rainfall during the early mid-Cretaceous. Although the latter interpretation is preferred, it cannot be proven.status: publishe

Alteration and fluid characteristics of a mineralised shear zone in the Lower Palaeozoic of the Anglo-Brabant belt, Belgium

In the Lower Palaeozoic rocks of the Brabant Massif (Belgium), a recently discovered polysulphide mineralisation is intimately related to a high strain zone. Data from drillings, completed with outcrop data allow a detailed investigation of mineralisation, alteration and fluid characteristics of this high strain zone, currently interpreted as a low-angle reverse shear zone and attributed to the main Early to early Middle Devonian Acadian deformation event. Ore mineralisation occurred synkinematically and was closely associated with the shear zone. I,ow saline H2O-CO2(-CH4)-NaCl fluids with temperatures gt 260 degrees C were involved in the hydrothermal circulation, which caused alteration of the host rock and extensive sericidsation in the shear zone. Isotope data and the general setting indicate a metamorphic-driven system

Deformation features in Paleogene sands in the Hoegaarden area (Belgium)

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