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Browsing ELibrary by Title
Now showing items 13427-13446 of 21879
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(2001)This paper presents a theoretical study on normally incident elastic P-wave transmission across single dry fractures with a nonlinear normal deformational behavior. The effects of nonlinear fracture normal behavior on ...
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(2001)An explicit expression, based on the second-order Neumann expansion, is derived for computing the gradual evolution of a monochromatic compressional seismic wave as it propagates through a medium, the density of which ...
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(1993)It is shown in four examples from geologically different environments that accessory or minor minerals rich in rare-earth elements (REE) are often texturally associated with base-metal sulfides. The examples demonstrate ...
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(2000)We have investigated the stability and composition of potassium amphibole and its high-pressure breakdown product phase X in synthetic peralkaline and subalkaline KNCMASH (K 2 O–Na 2 O–CaO–MgO–Al 2 O 3 –SiO 2 –H 2 O) and ...
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(2000)We have investigated the stability and composition of potassium amphibole and its high-pressure breakdown product phase X in synthetic peralkaline and subalkaline KNCMASH (K2O–Na2O–CaO–MgO–Al2O3–SiO2–H2O) and natural KLB-1 ...
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(2002)This study focuses on the coupled transport of dissolved constituents and particulates, from their infiltration on a karst plateau to their discharge from a karst spring and their arrival at a well in an alluvial plain. ...
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(2000)This study re-estimates one important component in the global carbon cycle: the modern global fluviatile organic carbon discharge- and burial rates. According to these results, approximately 430×1012 g of terrestrial organic ...
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(2001)The transport of Th, Ra, and 210Pb from a continental source region and through an estuarine environment was investigated. Unlike previous studies, here both short- and long-lived nuclide data were obtained for river inputs, ...
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(2002)Understanding the stability of radiation-damaged zircon under low-temperature hydrothermal conditions is crucial to the application of zircon for U–Pb geochronology and as a host phase for the disposal of plutonium waste. ...
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(2004)Over 1.6 million liters of radioactive, high-temperature, Al-rich, alkaline and saline high-level waste (HLW) fluids were accidentally discharged from tank leaks onto the sediments at the Hanford Site, Washington. In order ...
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(1998)Material recycling in subduction zones, including the generation and migration of aqueous fluids and melts, is key to understanding the origin of volcanism in subduction zones and is also important for understanding the ...
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(1999)Group IIIAB, the largest iron-meteorite group, shows compositional trends (including a three-order-of-magnitude Ir concentration range) indicating that it formed by fractional crystallization of a metallic magma. Because ...
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(2004)Twenty-two dark inclusions (DIs) from Allende (18), Leoville (2), Vigarano (1) and Efremovka (1) were studied by the I-Xe method. All except two of these DIs (Vigarano 2226 and Leoville LV2) produce well-defined isochrons, ...
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(2004)Analytical hydropyrolysis performed under high hydrogen gas pressure (>10 MPa) has been demonstrated to possess the unique ability to release high yields of biomarker hydrocarbons covalently bound within the non-hydrocarbon ...
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(2004)The new mineral trattnerite, (Fe,Mg)2(Mg,Fe)3[Si12O30], a member of the milarite group, occurs in small cavities of a Sirich xenolith at the haüyne-nephelinite quarry Stradner Kogel, eastern Styria, Austria. Trattnerite ...
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(2002)An approximation to the traveltime field is calculated for an elastic wave that propagates in a homogeneous anisotropic layer and is reflected at a plane boundary. The traveltime is approximated by a Taylor series expansion ...
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(2003)We present the results of a comprehensive numerical study of 3-D acoustic wave propagation in weakly heterogeneous random media. Finite-frequency traveltimes are measured by cross-correlation of a large suite of synthetic ...
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(2003)Nine Scots pine tree-ring-width chronologies were compared regarding growth variability and response to climate along a gradient of oceanicity–continentality at 62–64°N in central Fennoscandia. The study revealed higher ...
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(2002)A detailed description is presented of the statistical patterns of climate forcing of tree growth (annual maximum latewood density and ring-width time series), across a network of 387 specially selected conifer sites that ...
Now showing items 13427-13446 of 21879