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Browsing ELibrary by Title
Now showing items 47-66 of 21768
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(2004)The Olondo greenstone belt is a unique structure lying in the Aldan Shield. The Aldan Shield is the largest basement salient in the Siberian craton. The Subgan granite-greenstone complex includes sedimentary, volcaniclastic ...
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(2003)В первой из серии статей "300 лет жизни камчатских вулканов" рассмотрена и проанализирована 350-летняя история эруптивной активности вулкана Молодой Шивелуч - самого северного из действующих вулканических аппаратов на ...
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(2004)В первой из серии статей "300 лет жизни камчатских вулканов" рассмотрена и проанализирована 350-летняя история эруптивной активности вулкана Молодой Шивелуч - самого северного из действующих вулканических аппаратов на ...
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(1995)Our studies of the 105 kg Chico L chondrite show that it contains #60% impact melt and the largest volume of impact melt recognized in stony meteorites. We suggest that it is part of a much larger dike complex that formed ...
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(1995)We determined a 39Ar-40Ar age of 4.495 +/- 0.015 Ga for the unbrecciated Ibitira eucrite. This age ranks among the oldest 39Ar-40Ar ages for eucrites and suggests that Ibitira escaped the widespread impact resetting of ...
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(1998)Determinations of 39Ar-40Ar ages for plagioclase separates of three clasts from the Vaca Muerta and Mount Padbury mesosiderites give similar results. Ages increase monotonically by #0.2-0.3 Ga when plotted against increasing ...
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(2004)We determined 39Ar- 40Ar ages of eight LL chondrites, and one igneous inclusion from an LL chondrite, with the object of understanding the thermal history of the LL-chondrite parent body. The meteorites in this study have ...
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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 ...
Now showing items 47-66 of 21768