993 resultados para Alexandra Land Island, Franz Josef Land


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Rb, Sr, Sm, Nd, U, and Pb contents and Sr, Nd, and Pb isotopic composition were determined in tholeiite and subalkaline basalts (in both whole-rock samples and individual minerals) from the Franz Josef Land Archipelago. Isotopic data obtained for the Arctic basin are similar to those for islands from the Pacific, Atlantic, and Indian oceans. The assimilation of crustal (sedimentary) rocks by primary depleted material makes isochron determination of basalt age difficult or impossible. The subalkaline basalts (basaltic andesites) were presumably formed by the metasomatic introduction of incompatible elements in tholeiitie basalts and, only partially, through crustal contamination and fractional crystallization.

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A combined study of magnetic parameters of basalt and andesite samples has been carried out in the framework of geological investigations of the Franz Josef Land. This study has included determination of coercivity, saturation magnetization, Curie points, natural remanent magnetization (NRM), and magnetic susceptibility as well as examination of ferromagnetic minerals with a microscope. Data on chemical composition of the rocks have been obtained for all the samples, and radiological ages have been determined for the majority of the rocks. Thermomagnetic curves of the samples have been subdivided into four types depending on composition of ferromagnetic NRM carriers. Data showing multiple changes in the predominant composition of the igneous rocks have been obtained. Each stage of magmatism is characterized by a specific type of the ferromagnetic component in the rocks and, therefore, magnetomineralogical investigations can be used for differentiation and correlation of the igneous rocks.

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Coal pebbles found in 1994 in the Greham Bell Island (Franz Josef Land Archipelago) are made up of Barzas-type cuticular liptobiolith. The coal belongs to the initial stage of catagenesis and is characterized by high content of cutinite (up to 70%) with very low reflectance (Ro = 0.1%). Maceration products show some tegillate elements of Arthropoda and individual Devonian spores. It is supposed that plant cuticle and Arthropoda exocuticle are present in this coal. Obtained data suggest presence of Paleozoic rocks in the sedimentary sequence, although they are not yet recovered. These data complement available information on distribution of specific Devonian coals and allow to have a new insight into zoogenic material involved in coal formation.

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The Climatological Database for the World's Oceans: 1750-1854 (CLIWOC) project, which concluded in 2004, abstracted more than 280,000 daily weather observations from ships' logbooks from British, Dutch, French, and Spanish naval vessels engaged in imperial business in the eighteenth and nineteenth centuries. These data, now compiled into a database, provide valuable information for the reconstruction of oceanic wind field patterns for this key period that precedes the time in which anthropogenic influences on climate became evident. These reconstructions, in turn, provide evidence for such phenomena as the El Niño-Southern Oscillation and the North Atlantic Oscillation. Of equal importance is the finding that the CLIWOC database the first coordinated attempt to harness the scientific potential of this resource represents less than 10 percent of the volume of data currently known to reside in this important but hitherto neglected source.

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Franz Josef Strauss, West German Minister of Atomic Energy and Minister of Defence, pursued a project by which European political integration was to be paralleled by co-operation in the field of nuclear energy and indeed nuclear weapons. It has often been alleged that this covered nationalist German ambitions to turn Germany into a nuclear power in its own rights. Seen in the context of his European integration programme - which foundered on the devotion of French President de Gaulle to French national sovereignty - Strauss' overall policy suggests that he did indeed aim not to obtain nuclear weapons for Germany, but for an integrated European superstate.

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Leopold Horowitz