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Browsing ELibrary by Title
Now showing items 9272-9291 of 21768
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(1988)Ore deposits in the Soviet Maritime region and other regions with a mature continental crust usually are confined to points of prolonged endogene activity. Igneous activity at such nodes is heterogeneous, and relative to ...
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(2001)Three M>8 earthquakes have occurred in Mongolia during a 52-year period (1905-1957). Since these earthquakes were well separated in space (400 km), the coseismic stress change is far too low (0.001 bar) to explain mutual ...
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(2004)In addition to shock effects in olivine, plagioclase, orthopyroxene and Ca-pyroxene, petrographic shock indicators in equilibrated ordinary chondrites (OC) include chromite veinlets, chromite-plagioclase assemblages, ...
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(1989)The problem of the formation and development of back-arc basins remains one of the most controversial in plate tectonics. This also pertains to newly formed suboceanic basins which arose, for instance, within the Alpine ...
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(2004)Despite being studied for over 200 years, the posture, locomotion, paleobiology, and phylogeny of pterosaurs are still poorly understood due to lack of well-preserved, three-dimensional specimens. In this paper we investigate ...
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(1995)The origin and the relationships between the high potassic (HKS) and potassic (KS) suites of the Roman Comagmatic Province and the nature of their primary magmas have been intensively debated over the past 35 years. We ...
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(2001)In this contribution, we propose using the concordia diagram, which was proposed by Wetherill, to evaluate the discordant values of K-Ar and Rb-Sr mineral ages. The considerable difference between the decay constants of ...
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(2001)Fertilization of agricultural land in groundwater infiltration areas often causes deterioration of groundwater quality. In addition to nitrogen and phosphorous, potassium deserves attention. The fate of potassium in the ...
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(2004)Among the calcium-aluminum-rich inclusions (CAIs), excess 41K (41K*), which was produced by the decay of the short-lived radionuclide 41Ca (t1/2 = 0.1 Myr, has so far been detected in fassaite and in two grains of melilites. ...
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(2001)Oxygen-17 magic angle spinning, non-spinning, 1H-decoupled, 1H-17O cross-polarization, and triple-quantum magic-angle spinning nuclear magnetic resonance (NMR) spectroscopy experiments were performed at two different ...
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(2002)The partitioning of K and Na between liquid Fe-S-O alloys and silicate melt has been determined over the pressure and temperature range 2.5-24 GPa and 1500-1900°C. In experiments with S-free Fe alloys, the alkali elements ...
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(1999)To determine the role of radioactive heating as an energy source in planetary cores, the solubility of K in metal has been examined experimentally. All experiments were conducted at 15 kbar and 1900°C and involved K ...
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(2000)No isotopic anomalies have yet been reported for K, but the relevant published literature is sparse and error limits for the scarce (0.01% abundance) isotope 40K are relatively large, 0.5 to 1%. We have developed thermal ...
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(1986)A large number of potassium-rich igneous rocks can be displayed as a contiguous set of mineral assemblages in a modified normative tetrahedron kalsilite-forsterite-larnite-quartz. Pairs of phases in subtetrahedra undergo ...
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(2001)Simple mineral acid extraction and open column chromatographic methods commonly used to isolate pyridinic nitrogen fractions from crude oil and rock extract appear to yield severely altered distributions of alkylquinolines ...
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(2002)The Trans-European Suture Zone (TESZ) is the most fundamental lithospheric boundary in Europe, separating the ancient crust of the Fennoscandian Shield–East European Craton from the younger crust of central Europe, and ...
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(1990)Many new practical methods of geophysical harmonic analysis appeared in the 1970's, including the Burg maximum-entropy method, the Pisarenko harmonic expansion method, the Capon spectral maximum-likelihood method, and their ...
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(2003)Considerable attention has focussed on methane hydrates as a potential energy resource but much less on the potential environmental problems of exploiting these deposits. In fact, methane hydrate deposits represent a dynamic ...
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(2003)General Circulation Models simulate significant changes of temperature and precipitation over Europe as part of the anthropogenic climate change. In this study, the impacts of climate change on groundwater recharge and ...
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(2001)Eleven petroleum source rock samples have been examined by Emission Fourier transform infrared spectroscopy (FTIRES) and by Rock-Eval thermal analyses. FTIRES has been used to estimate the amount of C-H aliphatic and C-H ...
Now showing items 9272-9291 of 21768