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Browsing ELibrary by Title
Now showing items 5034-5053 of 26297
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(1999)Evaporation rates of forsterite in the primordial solar nebula were modeled. There are 3 evaporation regimes expected: 1. free evaporation-dominated (FED) regime, where forsterite evaporates as free evaporation, 2. hydrogen ...
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(1999)Single crystals of forsterite were evaporated in a vacuum furnace at temperatures of 1500-1800°C to study evaporation kinetics, magnesium isotopic fractionation, and magnesium diffusion in forsterite. The evaporation of ...
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(2006)A compilation of data on volumes and masses of evaporite deposits is used as the basis for reconstruction of the salinity of the ocean in the past. Chloride is tracked as the only ion essentially restricted to the ocean, ...
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(1996)Synchronous occurrence of three large event borderlines at 1.100, 850, and 650 Ma in the Neoproterozoic is shown for the Siberian Platform in the northern part of the Central-Asian foldbelt and Chinese Platform. They ...
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(2001)In the history of the Kazanian sea basin in the Russian plate, periods of quasi-stationary shoreline position alternated with quick phases of transgressions and regressions. The last events were responsible for appearance ...
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(2003)The presence of event beds in the shallow-marine stratigraphic record indicates formation is governed by high magnitude-low frequency processes rather than low magnitude-high frequency processes. In this paper, a 2-D ...
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(2001)Petroleum-geochemical analyses of carbonaceous regionally metamorphosed rocks, carbonaceous rocks from ore deposits, and alkalic plutonic rocks from diverse settings, demonstrated the presence of very low to moderately low ...
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(2001)Upper Cambrian to Lower Ordovician radiolarites (alternations of ribbon-banded radiolarian cherts and siliceous shales) from Kazakhstan are dated accurately by means of conodonts. They represent the only known continuous ...
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(2002)In the seventeenth century, two tsunamis that were generated by earthquakes on the Kuril-Kamchatka subduction zone inundated the eastern coast of Hokkaido, northern Japan. Stratigraphic evidence for these two tsunamis and ...
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(1996)We present evidence from tungsten (W) isotopic measurements consistent with the presence of live 182Hf (T1 = 9 Ma) in the early solar system. This is based on the observation of a well-resolved deficit of about four parts ...
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(2000)True polar wander (TPW), the shift of the Earth’s rotation axis with respect to the entire globe, is most probably due to mass redistribution in the Earth’s mantle as a result of convection. Using a new rigorously selected ...
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(2005)Temporal clustering of the larger earthquakes (foreshock-mainshock-aftershock) followed by relative quiescence (stress shadow) are characteristic of seismic cycles along plate boundaries. A global seismic-moment release ...
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(2001)A central problem in understanding the Earth system is the relationship between mantle convection and near-surface structure, geophysics and geochemistry. Unexplained anomalies of the plate tectonics (PT) model are the ...
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(2003)We combine updated GPS velocities from the Nubian (NU), Eurasian (EU), and North American (NA) plates with 500 new 3.16-Myr-average seafloor spreading rates and nine transform fault azimuths from the northern Atlantic and ...
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(1999)We studied the cosmic-ray records of the H6 chondrite ALH76008 in a bulk sample, in a chondrule fragment, and in matrix material. The matrix was separated into olivine/pyroxene, plagioclase, and metal concentrates. For all ...
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(2006)To date, all Cretaceous ichthyosaur material from North America has been referred to the species Platypterygius americanus. This species is generally identified based on skull and paddle morphology, but all non-diagnostic ...
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(2006)Unusually magnesian (Mg# ~76) basalts have been sampled from a small submarine volcano situated on the Mariana arc magmatic front. Total alkalis range from 1.7 to 1.94%, Al2O3 from 9.09 to 10.3% and CaO from 13.9 to 14.09%. ...
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(2006)Recent analyses of elemental concentrations and mineralogy of iron-bearing compounds of Martian soils and rocks by the Mars Exploration Rovers at Meridiani Planum and Gusev Crater demonstrate that phosphorus concentration ...
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(2001)13C-depleted archaeal-derived ether-bound cyclic biphytanes occur in particulate organic matter from the euxinic waters of the Black Sea. These strongly 13C-depleted biomarkers (up to -58%%) provide evidence that archaea ...
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(1999)Using zinc sulfide as an example, we demonstrate a plausible stepwise process for the formation of minerals from low temperature aqueous solutions. The process occurs with the formation of soluble complexes that aggregate ...
Now showing items 5034-5053 of 26297