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GeologyScience Repository: Recent submissions
Now showing items 3001-3020 of 40311
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(2005)Partitioning of Ca, Mn, Mg, and Fe2+ between olivine and melt has been used to examine the influence of energetically nonequivalent nonbridging oxygen in silicate melts. Partitioning experiments were conducted at ambient ...
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(2005)α-Amino acids and α-hydroxy acids are well known constituents of several carbonaceous meteorites. One proposed mechanism of their formation is the reactions of CN−, NH3, aldehydes and ketones in aqueous solution, a ...
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(2005)Using trace metal-defined culture conditions, we measured the cellular barium concentration in cultures of the diatom Thalassiosira weissflogii. In cultures with low Fe concentration, at a typical surface seawater Ba ...
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(2005)The stable boron isotope ratio (11B/10B) in marine carbonates is used as a paleo-pH recorder and is one of the most promising paleo-carbonate chemistry proxies. Understanding the thermodynamic basis of the proxy is of ...
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(2005)The fate and transport of uranium in contaminated soils and sediments may be affected by adsorption onto the surface of minerals such as montmorillonite. Extended X-ray absorption fine structure (EXAFS) spectroscopy has ...
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(2005)We have studied thermochemistry of the first hydration steps for Cl-, Br-, and I- in the gas phase both experimentally using high-pressure mass spectrometry (HPMS) and theoretically using density functional theory (DFT) ...
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(2005)We found thirty compound chondrules in two CV3 carbonaceous chondrites. The abundance in each meteorite relative to single chondrules is 29/1846 (1.6%) in Allende and 1/230 (0.4%) in Axtell. We examined petrologic features, ...
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(2005)The skeletal oxygen isotope ratio of Porites corals is the most frequently used proxy of past seawater temperature and composition for tropical and subtropical oceans. However, field calibration of the proxy signals is ...
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(2005)Models for thermodynamic behavior of FeO-bearing liquids are required for understanding the separate roles of evaporation, condensation and crystallization in the formation of free-floating silicate liquid droplets in the ...
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(2005)The fractionation of the isotopes of Mo between different geological environments has recently been determined to high accuracy using mass spectrometry (Barling et al., 2001). Fractionation is observed between Mo in seawater, ...
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(2005)We have measured diffusion coefficients for P, Cr, Co, Ni, Cu, Ga, Ge, Ru, Pd, Ir, and Au in Fe metal from 1150 to 1400°C and at 1 bar and 10 kbar. Diffusion couples were prepared from high-purity Fe metal and metal from ...
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SULFUR ISOTOPE COMPOSITION OF PUTATIVE PRIMARY TROILITE IN CHONDRULES FROM BISHUNPUR AND SEMARKONA (2005)The sulfur isotopic compositions of putative primary troilite grains within 15 ferromagnesian chondrules (10 FeO-poor and 5 FeO-rich chondrules) in the least metamorphosed ordinary chondrites, Bishunpur and Semarkona, have ...
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(2005)Ionization constants for several simple amino acids have been measured for the first time under hydrothermal conditions, using visible spectroscopy with a high-temperature, high-pressure flow cell and thermally stable ...
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(2005)We have measured activity coefficients for NiO and FeO in a variety of silicate melts (SiO2-CaO-MgO-Al2O3) using electrochemical methods similar to square wave voltametry. We report the activity of the oxide ion (aO2−) in ...
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THE EARLY DIFFERENTIATION HISTORY OF MARS FROM 182W-142ND ISOTOPE SYSTEMATICS IN THE SNC METEORITES (2005)We report here the results of an investigation of W and Nd isotopes in the SNC (Shergottite-Nakhlite-Chassignite (martian)) meteorites. We have determined that ε182W values in the nakhlites are uniform within analytical ...
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(2005)Stable carbon and oxygen isotope measurements of biogenic carbonate provide information for reconstructing past oceanic environments. In particular, 18O/16O ratios correlate with the temperature and salinity of seawater ...
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(2005)Chondritic clast PV1 from the Plainview H-chondrite regolith breccia is a subrounded, 5-mm-diameter unequilibrated chondritic fragment that contains 13 wt% C occurring mainly within irregularly shaped 30–400-μm-size opaque ...
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(2005)Micron-scale variations in the trace-element (TE) composition of tropical coral skeletons were measured using laser-ablation ICP-MS (LA-ICP-MS) as part of an investigation into the chemical processes underlying paleoenvrionmental ...
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(2005)The plutonic rocks of the magnesian suite (Mg-suite) represent the period of lunar basaltic magmatism and crustal growth (∼4.46 to 4.1 Ga) that immediately followed the initial differentiation of the Moon by magma ocean ...
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STRUCTURES AND STABILITIES OF CD(II) AND CD(II)-PHTHALATE COMPLEXES AT THE GOETHITE/WATER INTERFACE (2005)The complexation of Cd(II) and Cd(II)-phthalate at the goethite/water interface were investigated by EXAFS and IR spectroscopy, by batch adsorption experiments and by potentiometric titrations at 298.15 K. The EXAFS spectra ...
Now showing items 3001-3020 of 40311