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Now showing items 10573-10592 of 39124
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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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(PANGAEA, 2015-04-28)
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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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(PANGAEA, 1957-08-31)The Kara scientific expedition of 1945, using the fishing trawler M. Gorkiy and survey vessel Osetr, took sediment samples in the Kara Sea in addition to other oceanographic work. The investigations of sediments composition ...
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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. ...
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(1993)During crystallization of silicate magmas, silica polymers advect into the reaction zone carrying other chemical species with them. If some species forming minerals are more abundant relative to Si in the liquid than in ...
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(1996)Granodiorite, amphibolite, and feldspar samples were dissolved in acidic, neutral, and basic solutions under ambient conditions as laboratory batch experiments. Oscillations of silicon and aluminium concentrations in ...
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(2000)Zoning in agate crystallizing in a medium enriched with silica, water, and trace elements may be caused by successive precipitation of the latter on the crystallization front. The Wang-Merino mathematical model of this ...
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(2002)The results of numerical treatment of proton-induced X-ray emission (PIXE) data for trace element (Fe, Sr, Zn) contents in agate from the environment surrounding the city of Pavlodar (Kazakhstan) are presented in this ...
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(1995)High-Mg volcanic rocks from the ca. 250 Ma old Siberian Flood Basalt Province (SFBP) were analyzed for their osmium and neodymium isotopic compositions in order to help to constrain source characteristics as the system ...
Now showing items 10573-10592 of 39124