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GeologyScience Repository: Recent submissions
Now showing items 2741-2760 of 40311
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(2016)New Os isotope and highly siderophile element (HSE) abundance data, in combination with lithophile trace element and Sm–Nd, Lu–Hf, and Hf–W isotope data, are reported for komatiitic basalts from the Vetreny Belt and tonalites ...
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(2005)New analyses of highly siderophile elements (HSE; Re, Os, Ir, Ru, Pt, and Pd) obtained by Carius tube digestion isotope dilution inductively coupled plasma mass-spectrometry (ID-ICPMS) technique are reported for 187Os-enriched ...
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(2016)Terrestrial magmatism is dominated by basaltic compositions. This definition encompasses mid-ocean ridge basalts (MORB), which account for more than eighty percent of Earth’s volcanic products and which are formed at ...
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(2006)Osmium, Ru, Ir, Pt, Pd and Re abundances and 187Os/188Os data on peridotites were determined using improved analytical techniques in order to precisely constrain the highly siderophile element (HSE) composition of fertile ...
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(2005)The solubility and incorporation mechanisms of H and various trivalent and divalent cations in synthetic rutile have been investigated. Experiments performed using different bulk Fe2O3 contents demonstrate that Fe3+ ...
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(2005)The search for extraterrestrial life was recently intensified because of new space missions. As long as life has not been found elsewhere in the universe, the best chances to discover extraterrestrial life are considered ...
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(2005)Locally diffusive, radiative heat transport inside the earth is represented by an effective thermal conductivity (krad,dif), calculated from spectra. Previous geophysical models assumed that emissivity (ξ) equals unity, ...
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(2005)High pressure optical and near infrared spectra of a single crystal of ringwoodite with composition (Mg0.90Fe0.10) 2SiO4 were measured to 21.5 GPa. The spectrum at ambient pressure shows a strong band at 12 265 cm-1 with ...
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(2005)Wavelet coherence analysis is defined and used to analyze the relationships between Length-Of-Day (LOD) variations and El Niño-Southern Oscillation (ENSO) on interannual scales. Using the newest observation data, this study ...
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MUD VOLCANOES AND MICROSEEPAGE: THE FORGOTTEN GEOPHYSICAL COMPONENTS OF ATMOSPHERIC METHANE BUDGET (2005)Mud volcanoes and microseepage are two important natural sources of atmospheric methane, controlled by neoritectonics and seismicity. Petroleum and gas reservoirs are the deep sources, and faults and fractured rocks serve ...
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(2005)The identified emissions of abiogenic carbon dioxide, carbon monoxide and methane are generally attributed to volcanic activity or to geochemical processes associated with thermometamorphic effects. In this paper we show ...
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(2005)This work examines the red luminescence of benitoite studied by laser-induced time-resolved luminescence spectroscopy. This method allows the differentiation between luminescence centers of similar emission wavelengths, ...
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(2005)After having re-read all the relevant literature on methane emission by mud volcanoes and after having recalculated my own flux estimates, it looks as if the problem with these papers are not the variations in total numbers, ...
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(2005)The Inner Carpathians comprise several distinct Neogene late-stage orogenic Pb-Zn-Cu-Ag-Au ore districts. The mineral deposits in these districts are closely related to volcanic and subvolcanic rocks, and represent mainly ...
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(2005)Noctilucent clouds play an important role in the physics of the summer polar mesopause. They consist of tiny ice crystals with characteristic dimensions smaller than 200 nm. However, neither exact shape of particles nor ...
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(2005)The relationships between the global carbon cycle and paleo-climates on short and long time scales have been based on studies of accumulation rate of the two main components of the sedimentary carbon reservoir, organic ...
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(2005)The equilibrium intracrystalline distribution of Mn and Mg between the M1 and M2 sites of a Mn-rich/Fe-free orthopyroxene (donpeacorite) was investigated by means of annealing experiments at temperatures between 980 and ...
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(2005)The loading of various phosphates on the surfaces of nanoparticles of allophane (1-2SiO2·Al2O3·5-6H2O) was investigated. The allophane used was a high-silica type with a Si/Al ratio of 0.85. The phosphate-sorption isotherm ...
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(2005)Among the oxides, spinels are relatively abundant constituents of stardust, as has been inferred from studies of presolar grains in meteorites. Up to now, only pure Mg-Al-spinels have been considered as a possible stardust ...
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(2005)A new thermodynamic model for multi-component spinel solid solutions has been developed which takes into account thermodynamic consequences of cation mixing in spinel sublattices. It has been applied to the evaluation of ...
Now showing items 2741-2760 of 40311