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Геология России: Recent submissions
Now showing items 1321-1340 of 40749
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(2006)The Lisov Granulite Massif differs from neighbouring granulite bodies in the Moldanubian Zone of southern Bohemia (Czech Republic) in including a higher proportion of intermediate–mafic and orthopyroxene-bearing rocks, ...
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(2006)The Neoproterozoic Aries kimberlite was emplaced in the central Kimberley Basin, Western Australia, as a N–NNE-trending series of three diatremes infilled by lithic-rich kimberlite breccias. The breccias are intruded by ...
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(2006)Detailed field evidence indicates that the Kameruka Suite plutons of the Bega Batholith, eastern Australia, grew by crystal accumulation on the floor of a magma chamber. Depositional features in the plutons, including mafic ...
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(2006)Rhyolite pumices and co-erupted granophyric (granite) xenoliths yield evidence for rapid magma generation and crystallization prior to their eruption at 15·2 ± 2·9 ka at the Alid volcanic center in the Danikil Depression, ...
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(2006)Large mafic–ultramafic layered intrusions may contain layers enriched in platinum-group elements (PGE). In many cases, the PGE are hosted by disseminated sulphides. We have investigated the distribution of the sulphides ...
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(2006)The Merensky Reef of the Bushveld Complex is one of the worlds largest resources of platinum group elements (PGE); however, mechanisms for its formation remain poorly understood, and many contradictory theories have been ...
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(2006)Whole-rock major and trace element and O, Sr, Nd and Pb isotopic data are reported for 3·0–0·89 Ma lamproites from the Leucite Hills, Wyoming, USA. The two main groups of lamproites, madupitic lamproites and phlogopite ...
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(2006)Skeletal carbonate mineralogy of 1183 specimens of marine bryozoans from the literature was examined for phylogenetic patterns in order to elucidate the effects of bryozoan mineralogy on geochemical and paleoenvironmental ...
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(2006)A mathematical approach is presented for the calculation of the major and trace element fractionation that is caused by growth of zoned garnet in metamorphic rocks. This approach is based on textural and compositional ...
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(2006)The effect of radiogenic heat production within the crust on thermal processes such as crustal anatexis is generally disregarded as bulk geochemical models suggest that crustal heat generation rates are too low to effect ...
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(2006)The East African Rift System is important to understanding plume-initiated rifting as manifest in the geochemistry of mafic lavas erupted along the rift throughout its evolution. We present new data from high-MgO Tertiary ...
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(2006)Crystal size distributions (CSD) are the most commonly studied character in quantitative textural investigations of igneous rocks. The quality of CSD depends fundamentally on the sample size (i.e. total number of crystals). ...
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(2006)The digital image of airborne radiometric data across South Africa reveals that the largest anomaly, ?100?nGy/h, is caused by the granulite-facies rocks of the Namaquan metamorphic complex, whereas most of the country is ...
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(2006)Whole-rock geochemical data on basaltic to rhyolitic samples from 12 volcanic centers are used to constrain the role of continental crust in the genesis of magmas formed beneath the anomalously wide subduction-related ...
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(2006)The Early to Middle Jurassic Talkeetna Arc section exposed in the Chugach Mountains of south–central Alaska is 5–18?km wide and extends for over 150?km. This accreted island arc includes exposures of upper mantle to volcanic ...
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(2006)Граница между мелом и палеогеном является одним из наиболее ярких рубежей в историй Земли. Для выяснения характера событий, происходивших в это время в континентальных условиях, большое значение имеет изучение растительных ...
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(2006)Вымирание среди морской биоты в конце перми (с пиком в джульфинском веке) было наиболее ярким в фанерозойской истории. На этом рубеже, вымерло до 96% видов, около 70% родов и 55% семейств. Коренные изменения произошли в ...
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(2006)Позднеордовикский биотический кризис был вторым в фанерозое по своим масштабам после пермо-триасового. Большинство исследователей рассматривало и продолжает считать этот кризис целиком, как результат великого хирнантского ...
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(2006)Вымирание как морских, так и наземных организмов на рубеже палеозойской и мезозойской эр, выразившееся в исчезновении около 90% видов в море и не менее 80% видов на суше и сопровождавшееся серьезными и глубокими изменениями ...
Now showing items 1321-1340 of 40749