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Browsing ELibrary by Title
Now showing items 8576-8595 of 21934
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(2004)Secondary ion mass spectrometer (SIMS) oxygen isotope analyses were performed on 24 clasts, representing 9 clast types, in the Dar al Gani (DaG) 319 polymict ureilite with precisions better than 1‰. Olivine-rich clasts ...
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(1999)Isotopic analyses of fluids from the wells drilled in the Mutnovsky geothermal field revealed that the water of a melting glacier in the crater of Mutnovsky Volcano might be a source of water supply to the Dachnyi and ...
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(2001)Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was used to measure distributions of the siderophile elements P, V, Cr, Fe, Co, Ni, Mo, Ru, Rh, Pd, W, Re, Os, Ir, and Pt in metal grains in the ...
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(2001)We have determined slip rates on the most active reverse faults, reconstructed an extensive preorogenic erosion surface, constructed local and regional cross sections, and dated syntectonic Tertiary sedimentary rocks by ...
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(2001)Investigations of natural and synthetic quartz specimens by cathodoluminescence (CL) microscopy and spectroscopy, electron paramagnetic resonance (EPR) and trace-element analysis showed that various luminescence colours ...
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(2003)Temporal patterns of origination and extinction are essential components of many paleontological studies, but it has been difficult to obtain accurate rate estimates because the observed record of first and last appearances ...
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(1997)The origins of surface roughness (λ) of powdered feldspar grains, the ratio of the total surface area quantified by gas adsorption to the surface area estimated by assuming an average grain geometry, has been investigated ...
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(2001)Orogenic gold deposits have formed over more than 3 billion years of Earth's history, episodically during the Middle Archean to younger Precambrian, and continuously throughout the Phanerozoic. This class of gold deposit ...
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(1998)The so-called `mesothermal' gold deposits are associated with regionally metamorphosed terranes of all ages. Ores were formed during compressional to transpressional deformation processes at convergent plate margins in ...
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(2000)Phyllonite and metaquartzite clasts occur in early Pliocene or possibly Miocene sediment at the base of the University of Wisconsin Arctic Ocean core Fl-380. Single-crystal 40Ar/39Ar laserprobe ages derived from feldspars ...
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(2003)Initial dissolution kinetics at orthoclase (001) and (010) cleavage surfaces were measured for ~2 to 7 monolayers as a function of temperature using in situ X-ray reflectivity. The sensitivity of X-ray reflectivity to probe ...
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(2002)Orthogonal cross joints extend across intervals between systematic joints in brittle sedimentary strata and abut the systematic joints at about 90° angles. These joints typically form a 'ladder-like' pattern if viewed on ...
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(1985)A new set of reversal experiments for coexisting ortho- and clinopyroxenes in the system CMAS at conditions between 1,000–1,570° C and 30 to 50 kb is presented and combined with literature data. Pyroxene behaviour, ...
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(1990)Control experiments were run at 700°C and 30 kb on a UTF-40 in silver-palladium ampoules. The starting materials were natural amphibole and garnet, as well as mixtures of oxides, oxalates, hydroxides and NaAlO2. Equilibrium ...
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(2003)Granulite facies magnesian metapelites commonly preserve a wide array of mineral assemblages and reaction textures that are useful for deciphering the metamorphic evolution of a terrane. Quantitative pressure, temperature ...
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(2001)The Vetreny belt in the southeast Baltic Shield is a large volcano-sedimentary basin containing a 4- to 8-km-thick sequence of basaltic to komatiitic lavas, which were erupted 2.45 Ga ago in a continental rift setting ...
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(1996)The study of 187 Re-187OS systematics in the orogenic lherzolite bodies of Baldissero, Beni Bousera, Lanzo and Lherz shows the extreme isotopic heterogeneity of these massifs. Peridotites have 187Os/186Os ratios that cluster ...
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(2000)New experimental results are reported on the partitioning of Os between Ni94Os6 (at) alloys and silicate melt at 1400 °C at one atmosphere total pressure and oxygen fugacities ranging from 10−6 to 10−8 atm. Specially ...
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(2002)Geological, mineralogical and Os isotopic data for detrital PGE-mineralization derived from the Guli and Bor-Uryah ultramafic massifs, within the Maimecha-Kotui Province (the northern part of the Siberian Platform, Russia), ...
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(1997)Humic acids in solution behave as a kinetic system that is characterized by steady-states rather than by equilibria. This is shown by redox measurements at 0.1 M NaCl and 24°C under carefully controlled anaerobic conditions. ...
Now showing items 8576-8595 of 21934