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Now showing items 6687-6706 of 43490
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(2004)Mineralogical and crystal-chemical descriptions are provided for two end-members of the new Group 5 introduced by Leake et al. (2004) in the nomenclature of amphiboles. This new classification scheme recognizes the occurrence ...
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(2002)Ferriallanite-(Ce), ideally CaCeFe3+AlFe2+(SiO4 (Si2O7)O(OH), is the analogue of allanite-(Ce) with Fe3+ dominant in the octahedral site M(1). It is of metasomatic origin and occurs in an alkaline granitic pegmatite of ...
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(2001)The crystal structure of ferrian winchite (□0.87K0.13)∑1.00 (Ca0.65Na1.34)∑1.99 (Mg2.78Fe2+0.12 Mn0.07Ti0.01)∑2.98 (Fe2+0.88Fe3+0.92 Al0.20)∑2.00 (Si7.88Al0.12)∑8.00 O22 ((OH)1.77F0.23)∑2.00, a 9.8339(2), b 18.0357(2), c ...
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(2006)The bulk Fe2O3 contents and inter-mineral distributions of Fe3+ were investigated in a suite of samples from several orogenic lherzolite massifs, including Beni Bousera (Morocco), Ronda (Spain) and Lherz (France). Ferric ...
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(2001)Seventy-five K2O-FeO-Fe2O3-SiO2 liquids were equilibrated in air between 1123°C and 1596°C. The bulk compositions of the quenched glasses range from 35 to 85 wt.% SiO2, 3 to 41 wt.% Fe2O3, 0 to 5 wt.% FeO, and 11 to 34 ...
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(1996)Several experimentally-based, empirical calibrations of the fO2 of natural silicate melts at atmospheric pressure as a function of melt composition, melt Fe2+/Fe3+, and crystallization temperature have been developed ...
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(2000)Although the electron microprobe has become the standard microanalytical tool in modern geosciences, conventional electron microprobe analysis does not allow determination of the valence states of elements such as Fe. The ...
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(PANGAEA, 2012-05-30)
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(PANGAEA, 1995-02-17)Data on mineral and chemical compositions of Fe-Mn nodules sampled in Cruise 49 of R/V Dmitry Mendeleev.
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(PANGAEA, 1993-12-09)
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(2004)Experiments on compositions along the join MgO–NaA3+Si2O6 (A=Al, Cr, Fe3+) show that sodium can be incorporated into ferropericlase at upper mantle pressures in amounts commonly found in natural diamond inclusions. These ...
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(1997)A suite of picroilmenite megacrysts from the Dalnaya kimberlite, Siberia, was found to fall into one of two groups, the most abundant having 11-12 wt% MgO and 650-1500 ppm Nb, and the others having lower MgO (8.8-10.2 wt%) ...
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(2001)Pink nanofibers were extracted from rose quartz from 29 different pegmatitic and massive vein localities throughout the world. Their width varied from 0.1 to 0.5 μm. On the basis of optical absorption spectra of the fibers ...
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(PANGAEA, 2019-03-04)The table contains the biallelic data for 8 loci (LOCUS#: "K241", "Ld56", "K225", "K224", "Ld45", "K235", "K260", "K066") for 612 Larix gmelinii individuals sampled within 100x100 m from site TY04-V1 located on the Taymyr ...
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(2001)The new variational statement is suggested for the elliptical equations systems describing behavior of structurally-inhomogeneous media. The statement is implemented in the form of a calculation algorithm. The inverse ...
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(2006)Snow entrainment alters the speed and hence the run-out distance of avalanches, yet little is known about this significant process. We studied entrainment in snow avalanches using observations from (1) the Swiss Vallée de ...
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(2009)The near-field expression of the tsunami produced by the 15 November 2006 Kuril earthquake(Mw8.1–8.4) in the middle Kuril Islands, Russia, including runup of up to 20 m, remained unknown until weconducted a post-tsunami ...
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(2002)A design of a dewatering system is necessary for site improvement prior to the construction of some structures. The design of an efficient dewatering system requires estimating the value of the in-situ coefficient of ...
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FIEST FIND OF ACCESSORY DIAMONDS IN DRUSITIC ECLOGITES OF SOME OPHIOLITE COMPLEXES IN TRANSBAIKALIA (1989)Most banded ophiolite complexes contain rocks with eclogite or eclogite-like parageneses. These include various mineralogical varieties of eclogite and eclogite-like rocks, glaucophane and eclogite-glaucophane schists, as ...
Now showing items 6687-6706 of 43490