Results 81 to 90 of about 15,904 (206)

Origin of Fe3+ in Fe-containing, Al-free Mantle Silicate Perovskite

, 2015
We have studied the ferrous (Fe2+) and ferric (Fe3+) iron concentrations in Al-free Fe containing Mg-silicate perovskite (Mg-Pv) at pressure (P), temperature (T), and oxygen fugacity (fO2) conditions related to the lower mantle using a thermodynamic ...
Morgan, Dane, Shim, Sang-Heon, Xu, Shenzhen   +2 more
core   +1 more source

A solid ceramic electrolyte system for measuring redox conditions in high temperature gas mixing studies [PDF]

The details of the construction and operation of a gas mixing furnace are presented. A solid ceramic oxygen electrolyte cell is used to monitor the oxygen fugacity in the furnace. The system consists of a standard vertical-quench, gas mixing furnace with
Williams, R. J.
core   +1 more source

A Critical Examination of the X-Wind Model for Chondrule and Calcium-rich, Aluminum-rich Inclusion Formation and Radionuclide Production

, 2010
Meteoritic data, especially regarding chondrules and calcium-rich, aluminum-rich inclusions (CAIs), and isotopic evidence for short-lived radionuclides (SLRs) in the solar nebula, potentially can constrain how planetary systems form.
Alan P. Boss, Anderson, Bacciotti, Beckett, Beckett, Blandford, Boley, Boss, Boss, Boss, Bouvier, Chevalier, Chiang, Ciesla, Coffey, Connelly, Connolly, Connolly, Connolly, Cuzzi, Cuzzi, Cuzzi, Cuzzi, Davis, Desch, Desch, Desch, Desch, Desch, Dodd, Dominik, Ebel, Eisner, Fedkin, Fedkin, Feigelson, Fitoussi, Gaidos, Getman, Gooding, Goswami, Goswami, Gounelle, Gounelle, Gounelle, Grossman, H. C. Connolly, Harker, Hewins, Hewins, Hewins, Hsu, Huss, Jacobsen, Jacobsen, Jones, Jones, Jones, Jones, Kita, Kita, Kita, Klerner, Koyama, Krot, Königl, Lauretta, Lee, Lee, Lee, Lee, Levy, Leya, Liffman, Liu, Lodders, Lofgren, Looney, M. A. Morris, MacPherson, MacPherson, MacPherson, McKeegan, Meibom, Meyer, Miura, Morris, Murty, Ouellette, Ouellette, Ouellette, Palme, Paque, Paque, Pilipp, Preibisch, Pudritz, Ray, Russell, Russell, S. J. Desch, Sahijpal, Sanders, Sargent, Scott, Shu, Shu, Shu, Simon, Simon, Skinner, Srinivasan, Tachibana, Takigawa, Teitler, Tominaga, Umeda, Umeda, Ushikubo, Vanhala, Wadhwa, Wadhwa, Ward-Thompson, Wasserburg, Wasserburg, Weidenschilling, Weidenschilling, Weisberg, Yu   +128 more
core   +1 more source

The system diopside-acmite-nepheline at low oxygen fugacity.

JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY, 1992
Nepheline component (NaAlSiO4, 20 wt.%) was added to the join diopside (CaMgSi2O6)-acmite (NaFeSi2O6) and the phase relations were determined at 10-12 atm ƒO2 and 1, 050-1, 300°C. The liquidus lines for wustite and clinopyroxene cross each other at about 1, 160°C and the composition of Di24Ac56Ne20.
Kosuke ONUMA, Susumu IKEDA, Eiji Ohtani, Takumi KATO   +3 more
openaire   +2 more sources

Petrological implications of melanite in the rocks of the Morro de São João Alkaline Complex, Casimiro de Abreu, Rio de Janeiro, Brazil [PDF]

Brazilian Journal of Geology
This article presents a study of the titanium-rich andradite garnet, melanite, which occurs in the rocks of the Morro de São João Alkaline Complex, of Paleocene age, located in the district of Casimiro de Abreu, southeast of the state of Rio de Janeiro ...
Mariana Bessa Fagundes, Anderson Santos, Mauro Geraldes, Sérgio de Castro Valente, Eliane Guedes, Theresa Rocco Pereira Barbosa, Júlio Lopes   +6 more
doaj   +1 more source

Origin of the RNA World in Cold Hadean Geothermal Fields Enriched in Zinc and Potassium: Abiogenesis as a Positive Fallout from the Moon-Forming Impact?

Life
The ubiquitous, evolutionarily oldest RNAs and proteins exclusively use rather rare zinc as transition metal cofactor and potassium as alkali metal cofactor, which implies their abundance in the habitats of the first organisms.
Armen Y. Mulkidjanian, Daria V. Dibrova, Andrey Y. Bychkov   +2 more
doaj   +1 more source

Volatilization-fractionation of silicates related to chondrite composition [PDF]

The compositions of chondritic meteorites are linked to the solar composition. It is believed that the chemistry of the (generally) drop-shaped chondrules which comprise a large portion of these meteorites may present valuable clues to their formation ...
Walter, L. S.
core   +1 more source

Oxygen Fugacities of Lavas from the Galapagos Islands and the Galapagos Spreading Center [PDF]

, 2005
Oxygen fugacity is one of the most important intensive variables that controls the phase relations and compositions of precipitating minerals. It is accepted that oxygen fugacity reflects the redox state of the mantle source region.
Rilling, Sarah E.
core  

TRANSPARENT CONDUCTING OXIDE SYNTHESIS OF ALUMINIUM DOPED ZINC OXIDES BY CHEMICAL COPRECIPITATION

Avances en Ciencias e Ingeniería, 2013
Aluminium doped zinc oxides (AZO) are promising replacements for tin doped indium oxides (ITO) but thin films show a wide range of physical properties strongly dependent on deposition process conditions.
Silvia Maioco, Claudia Vera, Natan Rajchenberg, Ricardo Aragón   +3 more
doaj  

Controlling factors of the metallogenic intensity in Han–Xing-type skarn iron deposits: insights from trace elements in magmatic magnetite

Frontiers in Earth Science
The Handan–Xingtai region is one of the important production areas of skarn-type iron deposits in China. The magmatic rocks associated with iron mineralization in this region are predominantly intermediate-basic and intermediate-felsic in composition ...
Jin Yanan, Jin Yanan, Wang Denghong, Zhang Juquan, Zhang Juquan, Zhang Long   +5 more
doaj   +1 more source