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Browsing ELibrary by Title
Now showing items 13560-13579 of 21936
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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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(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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(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 ...
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(2004)In order to investigate the potential of combined Th-U-Pb isotope and 230Th/238U disequilibrium systematics for tracing magmatic crystallization and melt evolution, conventional high-resolution single-crystal TIMS techniques ...
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(1995)The U-Th-Pb and Sm-Nd isotopic systematics of mineral separates from the Goalpara ureilite were studied after applying acid leaching techniques. The separates were successively leached with dilute HBr and HNO3 in order to ...
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(2002)The dominant occurrence of phosphate minerals in crystalline rocks is as accessory phases, most notably apatite, monazite, and xenotime. Because these minerals tend, to varying degrees, to partition U and Th into their ...
Now showing items 13560-13579 of 21936