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Now showing items 16983-17002 of 39126
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(2000)A survey of global ocean island basalt geochemistry shows a remarkably strong linear correlation (average r2 = 0·95) between Zr and Nb concentrations. Fractional crystallization explains neither the range in Zr and Nb ...
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(1866)
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(2003)The Palaeoproterozoic Kuetsjarvi Sedimentary Formation from the Pechenga Greenstone Belt, NW Russia, has been studied with the purpose of determining δ13Ccarb and δ18Ocarb values in various carbonate phases from genetically ...
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(1998)Analyses of the organic compounds in the Murchison meteorite have led to a greater understanding of the nature of extraterrestrial organic materials. However, the relationship between low and high molecular weight material ...
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(1998)Analyses of the organic compounds in the Murchison meteorite have led to a greater understanding of the nature of extraterrestrial organic materials. However, the relationship between low and high molecular weight material ...
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(2002)Low-molecular-weight (LMW) aqueous organic acids were generated from six oil-prone source rocks under hydrous-pyrolysis conditions. Differences in total organic carbon-normalized acid generation are a function of the initial ...
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(2001)Soil organic carbon can be labelled at natural abundance by the cultivation of C4 plants, e.g. maize, on soils which have been previously cropped with isotopically distinct C3 plants, e.g. wheat. Particle-size fractions ...
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(2004)We examined δ13C values of shallow and deep-water scallop shells as well as δ13C of dissolved inorganic carbon (DIC) from the Bay of Brest in western Brittany. Time series of shell calcite δ13C do not reflect seasonal ...
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(1998)δ18O values of both carbonate (18.7-25.1%%) and phosphate (15.1-16.7%%) components of the francolite from the fossil brachiopod shells are interpreted as the result of a partial resetting of pristine isotopic compositions. ...
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(2002)Belemnite guards of Cretaceous and Jurassic age were found to contain varying amounts of quartz deposited both on the external surface and inside the rostrum. The oxygen isotopic composition of coexisting carbonate, quartz ...
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(1996)The whole-rock δ18O of mudrocks, as well as the δ18O of the clay-sized silicate fraction, does not change in any systematic manner over Paleozoic and late Proterozoic time. Therefore, the δ18O of the ocean has not changed ...
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(1987)The present paper studies the effect of the pH2 on the solubility of minerals in terms of phase diagrams of μ$-H$(2)$/ (pH2) versus X (by analogy with the μH+ (pH)-X) diagrams discussed previously. As an example, the authors ...
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(2016)В работе приводятся данные о составе и возрасте гранитоидов одного из массивов Гродековского батолита (Южное Приморье). Показано, что в составе батолита присутствуют гранитоиды повышенной щелочности, обогащенные высокозарядными ...
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(Государственное образовательное учреждение высшего профессионального образования «Томский политехнический университет», 1969)
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(Минералогический музей им. А.Е. Ферсмана РАН (Москва), 2007)Описывается научная и организаторская деятельность известного ученого – доктора геолого-минералогических наук, профессора А.А. Годовикова – директора Минералогического музея им. А.Е. Ферсмана РАН в период с 1984 по 1995 ...
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(2018)А.Б. Миссуна (1869—1922) принадлежит к числу первых российских женщин-еологов. Большинство её научных работ посвящено четвертичным ледниковым отложениям, которые она изучила в бассейнах рек Вилюй, Двина, Неман на территории ...
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(2018)В статье приведены воспоминания А.П.Павлова (1854–1929) — профессора Императорского Московского университета и основателя первой в стране геологической школы — о Йеллоустонском национальном парке (США), который он посетил ...
Now showing items 16983-17002 of 39126