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Browsing ELibrary by Title
Now showing items 3226-3245 of 20247
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(1997)During the ARCTIC '91 expedition aboard RV Polarstern (ARK VIII/3) to the Central Arctic Ocean, a box corer sample on the Gakkel Ridge at 87°N and 60°E yielded a layer of sand-sized, dark brown volcanic glass shards at the ...
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(2001)A review is presented of the currently available evidence of life in the Precambrian, with special reference to microfossils of the size range 0.1-3 μm. The particles are spotted in thin sections of the rock under high ...
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(1989)The oldest supracrustal rocks of the Olekma granite-greenstone region constitute a large 0.8 × 9.5-km erosion remnant among infracrustal formations of the Olekma granite-gneiss complex. They are components of the so-called ...
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(1996)The Neoproterozoic–Cambrian succession in the Zavkhan Basin of western Mongolia preserves early Cambrian bioconstructions of Nemakit-Daldynian to Botomian age. As elsewhere (Siberia, Morocco), the Nemakit-Daldynian ...
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(2002)The end of the Proterozoic–beginning of the Cambrian is marked by some of the most dramatic events in the history of Earth. The fall of the Ediacaran biota, followed by the Cambrian Explosion of skeletonised bilaterians, ...
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(2002)Despite the fact that crinoids were an important component of the benthic communities in the Early Carboniferous seas of central European Russia, their remains have been only poorly studied so far. The present work partly ...
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(2005)The 182Hf-182W isotopic systematics of Ca-Al-rich inclusions (CAIs), metal-rich chondrites, and iron meteorites were investigated to constrain the relative timing of accretion of their parent asteroids. A regression of the ...
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(2004)This article discusses the isotopic dates for the Albian alkaline basic rocks (116-104 Ma) in the Pribrezhnaya structural zone of the Primor'e region and investigated their mineral compositions. The graphite-ilmenite ...
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(2001)Some Early Cretaceous ammonites nominally listed in the stratigraphic schemes and works on the Lower Cretaceous stratigraphy of the Sikhote-Alin are briefly described and pictured in this paper. Side by side with the ...
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(2003)In Baikal region, Mesozoic depressions are widely noted. Their formation was accompanied by active volcanism. So far, nature of the volcanism is not totally clear. In connection with this, paleomagnetic investigations of ...
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(2004)This study is the first of a series of works on trigoniids (Class Bivalvia) from the Lower Cretaceous of the Crimea. It contains systematic descriptions of nine genera and 15 species and subspecies of trigoniids from the ...
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(2001)Early Cretaceous vertebrates at Shestakovo were known since 1953, when 2 partial Psittacosaurus skeletons were found. Intensive excavations and screen-washing at Shestakovo 1 and 3 localities, carried out since 1995 by a ...
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(2005)The plutonic rocks of the magnesian suite (Mg-suite) represent the period of lunar basaltic magmatism and crustal growth (∼4.46 to 4.1 Ga) that immediately followed the initial differentiation of the Moon by magma ocean ...
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(2001)Labradorite reacted with HCl solution (pH = 2.0) develops leached layers extending to about 500 #9 depth after 12 h leaching, and to 1500 #9 depth after 143 h leaching. Accurate Al, Ca, and Na compositional depth profiles ...
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(2002)Petroleum geochemistry is the outgrowth of the application of the principles and methods of organic chemistry to petroleum refining and petroleum geology. This paper reviews 120 years of petroleum geochemistry, from about ...
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(2004)Lochkovian redbeds in the Dnester formation in Podolia, Ukraine, record an upward transition from marginal-marine to fluvial conditions. A 60-m-thick section through transitional strata reveals a regressive stack of three ...
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(1997)The present work describes processes that change, within decades, the composition of interstitial water and the mineral assemblage of the newly formed unsaturated zone in the coastal Dead Sea aquifer. The main processes ...
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(1995)Long-term subaqueous decomposition patterns of five different vascular plant tissues including mangrove leaves and wood (Avicennia germinans), cypress needles and wood (Taxodium distichum), and smooth cordgrass (Spartina ...
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(1996)Fluorescence at wavelengths characteristic of humic substances (excitation 350 nm, emission 450 nm) have been used in this study to approximate concentrations of fluorescent dissolved organic material (FDOM). In situ ...
Now showing items 3226-3245 of 20247