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Now showing items 12737-12756 of 39126
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(2001)There were three negative seawater strontium-isotope excursions (shifts to lower 87Sr/86Sr values) during the Jurassic and Cretaceous that were of relatively short duration (5-13 my) and showed a relatively quick recovery ...
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(1996)The second, modified and essentially supplemented edition of the International Stratigraphic Guide, which was published in 1994, is discussed with consideration of its peculiar features and differences from the first edition ...
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(1988)Jaipurite, cobalt sulfide CoS, was discovered in 1846 and named for the locality in India, where it was associated with pyrrhotite in old schist. We found jaipurite among minerals of the potassic feldspar-quartz-bornite- ...
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(Федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский горный университет», 2018)The paper discusses the results of bulk rock geochemical sampling of the Kamenushinsky massif eluvial-deluvial deposits and the massifs bedrocks spectral analysis data. Evaluation of secondary dispersion halos using ...
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SECONDARY MELT INCLUSIONS IN OLIVINE FROM UNALTERED KIMBERLITES OF THE UDACHNAYA-EAST PIPE, YAKUTIA (2003)In the central part of the Udachnaya-East kimberlite pipe situated in the Daldyn–Alakit district of the Yakutian kimberlite province, unique (in the high degree of its preservation) kimberlitic rock with abundant olivine, ...
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(2003)Iron (hydr)oxides not only serve as potent sorbents and repositories for nutrients and contaminants but also provide a terminal electron acceptor for microbial respiration. The microbial reduction of Fe (hydr)oxides and ...
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(2003)Discovery of apovolcanic aluminoquartzite with rare metal phosphate mineralization drastically changed the notions on mineragenic potential of Riphean metamorphic complexes in the Polar Urals. Until recently, it was believed ...
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(2006)On Kamchatka, detailed geologic and geomorphologic mapping of young volcanic terrains and observations on historical eruptions reveal that landslides of various scales, from small (0.001 km3) to catastrophic (up to 20–30 ...
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(1999)Several high alumina basalts from the Aleutian volcanic centers of Cold Bay and Kanaga Island contain large (up to 1.5 cm diameter) megacrysts of sector-zoned augite. The megacrysts are invariably euhedral with well developed ...
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(Федеральное государственное бюджетное учреждение науки Институт земной коры Сибирского отделения Российской академии наук, 2016)Paradoxically, the lists of "proxies" of both plateand plume-related settings are devoid of even a mention of the high-grade metamorphic rocks (granulite, amphibolite and high-temperature eclogite facies). However, the ...
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(2003)Geochemical and isotopic data from Mesozoic lavas from the Jianguo, Niutoushan, Wulahada, and Guancaishan volcanic fields on the northern margin of the North China Craton provide evidence for secular lithospheric evolution ...
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(1985)At the same Mg-number, a decrease is observed in the average content of Ni, Co, and Cr in basalts between 2.5 and 2.0 b.y. Such decreases can be accounted for by smaller degrees of melting in the mantle in response to ...
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(2003)An extension of the seawater secular-variation model that successfully predicted the observed timing of Phanerozoic MgSO4 vs. KCl marine evaporites and aragonite seas vs. calcite seas has been applied to the prediction of ...
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(1998)Stable carbon isotopic compositions of C15+ saturate and aromatic hydrocarbon fractions from 514 crude oils from known source rocks were examined for secular, episodic variations. The oils have been correlated by means of ...
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(PANGAEA, 2017-07-31)We here present lithological, geochronological, and geochemical data from a core drilled in 1999 in the Ivashkina Lagoon on the Bykovsky Peninsula, Northeast Siberia.
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(2004)A new concept of a "living ocean" is based on thousands of analyses of suspended particulate matter from all oceans, in situ studies of particle fluxes and sedimentation rates, and mass estimates of present and past (in ...
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(2003)The effects of sediment surfaces on methane hydrate formation and dissociation were investigated using colloidal suspensions and new experimental methods developed for a large volume (72 liters), temperature-controlled ...
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(2003)In nature, erosive rainstorms are usually associated with high winds. Therefore, a quantification of wind and rain interactions and the effects of wind on detachment and transport processes provides a great opportunity for ...
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(2003)The understanding of soil erosion processes and the development of accurate erosion prediction models require understanding of detachment, deposition, and sediment transport in rills. The objectives of this study were to ...
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(2004)Sedimentary basin inversion, the shortening of formerly extensional basins, is accommodated mainly by compressional reactivation of extant faults and fractures across a wide range of scales. As such, inversion is a large-scale ...
Now showing items 12737-12756 of 39126