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Browsing ELibrary by Title
Now showing items 1545-1564 of 22187
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(2004)This paper concerns the interpretation of borehole geophysical data from basalt sequences, especially continental basalt sequences that host aquifers. Based on modifications of the rules used for interpreting borehole data ...
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(2006)Boric acid, B(OH)3, forms complexes in aqueous solution with a number of bidentate O-containing ligands, HL-, where H2L is C2O4H2 (oxalic acid), C3O4H4 (malonic acid), C2H6O2 (ethylene glycol), C6H6O2 (catechol), C10H8O2 ...
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(2005)B(OH)3 and CO2 are acidic species of considerable geochemical importance, yet the microscopic nature of the acid dissociation reactions for these B and C species is not well understood. Quantum mechanical methods have ...
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(2004)We show that the linearized reflection coefficients for arbitrary anisotropic media embedded in an isotropic background can be derived directly from a Born formalism. Due to rapidly varying phases of the scattered waves ...
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(2003)Borocookeite, ideally Li1+3xAl4–x(BSi3)O10(OH,F)8 (where “x” varies in the range 0.00–0.33 apfu), in which [4]Al is replaced by B relative to cookeite, occurs as a late-stage pocket mineral in the Sosedka and Mokhovaya ...
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(2004)The concentrations of B, F, and other "crustal" elements (Li, Sn, Rb, and Cs) in some mantle-derived rocks from the Pamirs and Tien Shan are higher than in the Earth's crust. In the mantle F is largely related to K being ...
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(1997)Experiments at 750 °C, 200 MPa(H2O), a (H2O)=1, and fO2 - Ni-NiO established that the equilibrium among tourmaline, biotite, cordierite, and melt (± spinel, aluminosilicate, or corundum) occurs with ∼2 wt% B2O3 in strongly ...
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(2001)Experiments were performed to measure the isotopic fractionation of boron between illite/smectite (I/S) clay minerals and water as a function of temperature (300° and 350°C) and degree of illitization. Corresponding changes ...
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(2005)Boron isotope composition of marine carbonates has been proposed as a paleo-pH proxy and potential tool to reconstruct atmospheric pCO2. The precise knowledge of the boron isotopic composition of ancient seawater represents ...
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(1996)The 11B10B ratios of thirty-two meteorite falls and nine lunar rocks were measured as Cs2BO+2 using thermal ionization mass-spectrometry. The11B10B ratios of meteorites vary from 4.011 to 4.098, i.e., their δ11B values ...
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(1997)Negative thermal ionization mass spectrometry (NTIMS) is an effective and robust analytical method which allows to analyze the boron isotopic composition (δ11B) of natural waters directly with an analytical uncertainty of ...
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(2006)Boron isotope compositions (?11B) and B concentrations of rains and snows were studied in order to characterize the sources and fractionation processes during the boron atmospheric cycle. The 11B/10B ratios of instantaneous ...
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(1999)Many arc lavas contain material derived from subducted oceanic crust and sediments, but it remains unresolved whether this distinctive geochemical signature is transferred from the subducting slab by aqueous fluids, silicate ...
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(2005)Boron isotopic fractionation during adsorption onto Ca-flocculated Aldrich humic acid (HA) has been investigated experimentally as a function of solution pH at 25°C and I = 0.15 M. Boron aqueous concentration and isotopic ...
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(1997)We have determined the boron content and isotopic composition of bulk carbonates and associated pore waters from Ocean Drilling Program Site 851. The δ11B of the carbonates range from 23%% to as low as -5.5%%, greatly ...
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(2000)Synchrotron radiation B K-edge XANES spectra are reported for 19 borate and borosilicate minerals. The spectra are characterized by three prominent features; a sharp peak (A) at ~194 eV (the edge feature of trigonal B; ...
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(2001)Synchrotron radiation boron K-edge XANES spectra collected in fluorescence yield mode are reported for monoclinic metaboric acid [HBO2(II)], sinhalite (MgAlBO4), and a selection of boron oxides in which B is exclusively ...
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(1998)Large submarine mud volcanoes in the abyssal part of the Black Sea south of the Crimean Peninsula are similar in many respects to synsedimentary mud volcanoes in the Mesoproterozoic Belt-Purcell basin. One of the Belt-Purcell ...
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(2003)Quaternary sedimentation in the northwestern Sea of Okhotsk, where tidal and thermohaline currents are active, was studied using 8443 km of high-resolution air gun profiles from four cruises. It is characterized by: (1) ...
Now showing items 1545-1564 of 22187