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Browsing ELibrary by Title
Now showing items 14348-14367 of 22924
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(2001)The bedrock in eastern Lapland is divided into the Naruska, Ahmatunturi and Vintilänkaira-Kemihaara granitoid complexes and the supracrustal Tuntsa metasedimentary and Tulppio metavolcanic belts. Traditionally the bedrock ...
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(1997)The dating of polymetamorphic rocks with the U-Pb zircon method often results in discordant data. Thus a new technique combining cathodoluminescence imaging (CL) and thermal ion mass spectrometry (TIMS) measurements was ...
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(1998)U-Pb and Pb-Pb isotopic systems were studied in limestones of the Inzer Formation representing the middle part of the Karatau Group of the Urals, whose section is authorized as the Upper Riphean stratotype. Carbonate rock ...
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(2004)В статье приведены результаты изотопно-геохронологических (U-Pb метод по цирконам) и геохимических исследований гранитоидов ряда массивов Мамынского террейна, традиционно относимых к условно раннепалеозойскому октябрьскому ...
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(2006)В строении Калгутинской рудно-магматической системы выделяются два интрузивных комплекса: калгутинский гранит-лейкогранитный и восточно-калгутинский комплекс даек и малых интрузий. U-Pb изотопное датирование единичных зерен ...
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(2006)A combined study of internal structure, U-Pb age, and Hf and O isotopes was carried out for metamorphic zircons from ultrahigh-pressure eclogite boudins enclosed in marbles from the Dabie orogen in China. CL imaging ...
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(2002)U-series dating of bone has suffered problems of reliability since its inception because bone remains an open system with respect to uranium. Commonly applied a priori assumptions of U uptake, such as early uptake or linear ...
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(2001)We have experimentally investigated the effects of crystal chemistry on the partitioning of U and Th between clinopyroxene and anhydrous silicate melt in a wide range of synthetic systems from 1 to 8 GPa and 1330 to 1735°C. ...
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(1996)Volcanic rocks from subduction zones are widely believed to originate by partial melting of mantle lherzolite modified by the addition of a fluid or melt extracted from the down-going slab. U-series disequilibrium in such ...
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(2006)Both chemical weathering rates and fluid flow are difficult to measure in natural systems. However, these parameters are critical for understanding the hydrochemical evolution of aquifers, predicting the fate and transport ...
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(2000)230Th, 232Th, 234U and 238U compositions of several deep-sea solitary corals, mainly the species Desmophyllum cristagalli, were determined by thermal ionization mass spectrometry (TIMS). It is possible to obtain high ...
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(2005)Both theoretical and empirical evidence shows that intracrystalline U-Th heterogeneity in zircon can lead to biases in (U-Th)/He ages if not accurately accounted for in a-ejection corrections. We present a model for age ...
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(2003)We performed a systematic study of (U-Th)/He ages of volcanic zircons of known eruption age to establish a reliable protocol for zircon He dating and to validate the resulting ages. Using laser He extraction and dissolution ...
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(2003)The 238U-230Th-226Ra and 235U-321Pa disequilibria have been measured by mass spectrometry in historic lavas from the Kamchatka arc. The samples come from three closely located volcanoes in the Central Kamchatka Depression ...
Now showing items 14348-14367 of 22924