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Browsing ELibrary by Title
Now showing items 13571-13590 of 21934
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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 ...
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(2001)The alkenone producing species Isochrysis galbana has been cultured at different temperatures, nutrient and light levels, to investigate effects of genetic and environmental variation on U37K'. The experiments show that: ...
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(2003)Type II porphyritic chondrules commonly contain several large (>40 μm) olivine phenocrysts; furnace-based cooling rates based on the assumption that these phenocrysts grew in a single-stage melting-cooling event yield ...
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(2001)For many years the presence of waxes in crude oils has been associated with organic matter derived from terrigenous sources. High temperature gas chromatography (HTGC) has been used to establish the ubiquitous presence of ...
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(2004)In the period of earthquake preparation, electromagnetic emissions appear over the seismic zones. In this work magma movements are considered as a possible source of ULF electromagnetic emissions over the zones with volcanic ...
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(2004)Ultra-calcic ankaramitic magmas or melt inclusions are ubiquitous in arc, ocean-island and mid-ocean ridge settings. They are primitive in character (XMg 4 0 65) and have high CaO contents (414 wt %) and CaO/Al2O3 (41 1). ...
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(2001)A fundamentally new model is proposed for the generation of heat and ultradeep fluids in the Earth's liquid core. Considering the rheological properties of the liquid core (viscosity from 103-105 to 107-109 poises), pressure ...
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(1997)A high-resolution calculation of strongly time-dependent thermal convection in the upper mantle with non-Newtonian, temperature-dependent rheology shows that, for an effective Rayleigh number of around 106, extremely fast ...
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(2002)The crystal structures and chemical compositions of two crystals of clinopyroxene (labelled K1 and K2) synthesized in the model system CaMgSi 2 O 6 -KAlSi 2 O 6 at 7 GPa, have been investigated. Quantitative analysis leads ...
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(2003)More and more evidence is being discovered in Phanerozoic collision belts of the burial of crustal rocks to previously unsuspected (and ever increasing) depths, presently on the order of 150–200 km, and of exhumation from ...
Now showing items 13571-13590 of 21934