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Browsing ELibrary by Title
Now showing items 54-73 of 21768
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(2005)A 3D, static fracture mechanics model of earthquake rupture that incorporates cohesive end zones (CEZs), or zones of increased frictional strength, is tested to determine whether it helps to understand the observed scaling ...
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(2004)We present a finite-element algorithm for computing NIT responses for 3D conductivity structures. The governing differential equations in the finite-element method are derived from the T-Omega Helmholtz decomposition of ...
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(2002)Vector and scalar magnetic anomaly maps have been determined from Magsat data on a spherical grid (35-60° in latitude and -10-30° in longitude) at an altitude of 400 km over the European region. These anomaly maps have ...
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(1991)3 He / 4 He and 20 Ne / 4 He ratios were measured in shallow underground waters (opened by water-supplying wells) of the Large Vud-Javr intramountain artesian basin in the Khibiny alkaline massif, the Kola Peninsula. The ...
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(2004)How the collision between India and Asia is related to processes deeper in the mantle is unclear. Here we compare geological reconstructions of block motions within Asia since ≈50 Ma with the tomographically imaged ...
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(2005)Analysis of δ18O in igneous zircons of known age traces the evolution of intracrustal recycling and crust-mantle interaction through time. This record is especially sensitive because oxygen isotope ratios of igneous rocks ...
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(1999)Following accretion of southern Siberian microcontinents to the Siberian craton in the Early Paleozoic, five cycles of K-rich silicic magmatism, progressively decaying in volume, occurred on batholithic scales throughout ...
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(1996)Hydrothermal bulk-loss experiments employing radiogenic Ar (4°Ar*) were performed to determine whether 40 Ar* diffusivity in biotite increases with Fe content. Diffusion laws determined for intermediate and Fe-rich biotite ...
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(1997)Five of six samples representing the entire stratigraphic sequence (∼3700 m thick) of basaltic flows in the Noril'sk section in the northwestern part of Siberian flood basalt province, Russia yield 40Ar–39Ar plateau ages ...
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(1995)Volcanic and intrusive rocks of the Chegem caldera and the nearby Eldjurta (Eldzhurtinskiy) Granite record a late Pliocene episode of silicic magmatism in the north-central Caucasus Mountains. Surface exposures, created ...
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(2006)Twenty-one 2-4 mm rock samples from the Apollo 12 regolith were analyzed by the 40Ar/39Ar geochronological technique in order to further constrain the age and source of nonmare materials at the Apollo 12 site. Among the ...
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(1999)The Multiple Diffusion Domain (MDD) theory of Ar loss, based on the 40Ar/39Ar method, has been used to obtain thermal histories, over tens of millions of years, in the range 500 °C to near-surface temperatures, of alkali ...
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(1999)West of the Main Uralian fault, the main suture in the southern Urals, 40Ar/39Ar apparent ages of amphibole, muscovite and potassium feldspar are interpreted as cooling ages. A fast exhumation of the metamorphic complex ...
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(2005)В статье представлены новые изотопно-геохронологические данные для мезозойских магматических образований Хингано-Олонойской вулканической зоны Хингано-Охотского вулканического пояса, полученные 40Аr/39Аr методом, а также ...
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(1998)We report depth profiles of the cosmogenic radionuclides 10Be, 26Al, and 41Ca in the titanium-rich lunar basalt 74275. The 10Be profile is flat: 10Be activities are confined to a narrow range between 9.6 and 11.2 dpm/kg ...
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(2004)Using classical diffusion theory, we present a mathematical technique for the determination of 4He concentration profiles in minerals. This approach should prove useful for constraining the low-temperature cooling histories ...
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(2002)5-n-Alkylresorcinols with alkyl chain lengths varying from C19 to C25 were identified solely in bog-forming plant species classified as sedges (Eriophorum vaginatum, E. angustifolium, Trichophorum cespitosum and Rhynchospora ...
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(1999)The model of Cr isotopic evolution presented here, relies on the relative volatility properties of the two elements: Mn-Cr in planetary formation processes. The Mn/Cr ratio of the respective parent bodies correlate in most ...
Now showing items 54-73 of 21768