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Now showing items 21-40 of 257
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(2006)Evidence from laboratory experiments indicates that fractionation against the heavy stable isotope of carbon (?13C) by bryophytes (liverworts and mosses) is strongly dependent on atmospheric CO2. This physiological response ...
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(2002)Theoretical models predict a marked increase in atmospheric O2 to ~35% during the Permo-Carboniferous (~300 Ma) occurring against a low (~0.03%) CO2 level. An upper O2 value of 35%, however, remains disputed because ignition ...
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(2001)Carbon isotopic composition was studied in oils and hydrocarbon gases from different oil and gas fields and reservoirs hosted in the Upper Cretaceous to Upper Pliocene sequences of the South Caspian mega-depression. It was ...
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(2002)The Hamitidae are a family of mid-Cretaceous heteromorph ammonites including lineages leading to four other families. Problems are outlined in trying to describe the phylogeny of completely extinct groups such as these ...
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(1999)Although submarine methane hydrates or clathrates have been highlighted as potential amplifiers of modern global climate change and associated glacio-eustatic sea-level rise, their potential role in sea-level fall has not ...
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(2004)Investigation of the Triassic–Lower Cretaceous rocks of the Dal'negorsk key section (southern Sikhote Alin) revealed the following successive associations of authigenic clay minerals: (1) sericite–chlorite (Lower Triassic); ...
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(1998)Variations of the atmospheric CO2 level and the global mean surface temperature during the last 150 Ma are reconstructed by using a carbon cycle model with high-resolution input data. In this model, the organic carbon ...
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(1997)The climate of the Holocene is not well suited to be the baseline for the climate of the planet. It is an interglacial, a state typical of only 10% of the past few million years. It is a time of relative sea-level stability ...
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(1999)The Grebenka flora comprising over 120 species of horsetails, ferns, gymnosperms, and angiosperms was found in a number of exposures of the upper subformation of the Krivaya Rechka Formation, the middle course of the Anadyr' ...
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(2001)A new box model for the global carbon-calcium-strontium cycle is developed to simulate the evolution of Cretaceous and Cenozoic seawater and atmosphere. The model accounts for carbon masses in ocean and atmosphere, in ...
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(2003)The Koolen metamorphic dome of Chukotka Peninsula has been interpreted as a mid-Cretaceous extensional core complex. On the NW flank of the dome, three lithotectonic units are exposed: (1) High-Grade unit, composed of ...
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(2000)The present paper summarizes the results of the investigations carried out in East Russia within the framework of the International Program of Geological Correlation (350) supported by UNESCO entitled "Cretaceous Environmental ...
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(1998)The character and intensity of Cretaceous events in continental margins are genetically linked with the rate of oceanic crust accretion and intensity of endogenic (plume) activity of the Earth. This is most evidently proved ...
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(2002)These last 10 years, numerical models of mantle convection have emphasized the role of the 670 km endothermic phase change in generating avalanches that trigger catastrophic mass transfers between upper and lower mantle. ...
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(2002)The upper amphibolite facies Koolen gneiss dome was subjected to 600–800 MPa pressures and >700 °C temperatures at deep structural levels, and 400–500 MPa and ∼600 °C temperatures at shallow levels during peak metamorphism ...
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(2003)The Cretaceous stratigraphy and main palaeogeographic features of the North-Eastern Peri-Tethys are briefly summarised on the base of new data. The study is mainly focused on the time-slices that were chosen for the recently ...
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(2001)В юго-восточной части Корейского полуострова вдоль зон левых сдвигов Конджу-Ымсонг и Кванджу-Ёндонг располагается серия эпиконтинентальных бассейнов готерив-альбского возраста, которые, судя по их геометрии и особенностям ...
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(2003)By the Late Jurassic, the northern part of the East Asian continental margin was diversified. Principal structural constituents were the Siberian (or North Asian) craton bounded on the east by a miogeosynclinal fold belt, ...
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(1996)Both the bolide impact hypothesis and the volcanism hypothesis suggest, as one of the major environmental consequences, the release of large amounts of SO2 and CO2 into the atmosphere, with consequent lowering of the pH ...
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(1988)The development of the Kurile island arc is though to have begun in the Late Cretaceous. In the Neogene deposits on northern and southern islands of this ridge, including Kunashir, there are well-rounded fragments of granite ...
Now showing items 21-40 of 257