Zobrazeno 1 - 10
of 70
pro vyhledávání: '"Otto Eugster"'
Autor:
Otto Eugster
Publikováno v:
CHIMIA, Vol 64, Iss 6 (2010)
Externí odkaz:
https://doaj.org/article/fc97af592ccc45a79ab1b0721e3ea807
Autor:
Otto Eugster
Publikováno v:
Gold Bulletin. 51:139-144
In this work, we present the application of the uranium, thorium–helium (U,Th–He) dating method to two different types of gold objects: geologic gold deposits and archeological gold objects. Direct dating of geologic gold deposits is difficult wi
Autor:
Bernd Lehmann, Thomas Zack, Matthias Barth, Francisco Robério de Abreu, Alexandre Raphael Cabral, Ernst Pernicka, Otto Eugster, Michael Brauns, Delia Rösel
Publikováno v:
Geology. 41:163-166
New analytical developments have made radiogenic helium ( 4 He) applicable to archeological gold artifacts for age determinations. Here we report the application of the U/Th– 4 He method to the direct dating of gold from the historically important
Publikováno v:
Archaeometry. 51:672-681
Forgeries of ancient gold objects are prevalent in almost every collection and some public exhibitions in the past have been exposed as containing forgeries to an embarrassing extent. This situation comes from the fact that it is sometimes impossible
Publikováno v:
Geochimica et Cosmochimica Acta. 70:5403-5425
We analyzed the spallogenic, trapped, fissiogenic and radiogenic noble gas components in various bulk samples of the angrites D’Orbigny and Sahara 99555 as well as in glass separates of D’Orbigny. The D’Orbigny glass samples show hints of solar
Publikováno v:
Meteoritics & Planetary Science. 41:A217-A230
The iron meteorite Shisr 043 is a single mass of 8267 g found in the south Oman desert 42 km NE of the Shisr village. It is the first iron identified among the >1400 individual meteorites reported from Oman. The meteorite is a slightly elongated mass
Autor:
Jordi Llorca, Ignasi Casanova, Otto Eugster, Matthias Laubenstein, Jose Luis Ortiz, Javier García-Guinea, José A. Docobo, Alan E. Rubin, Wayne N. Edwards, A. J. Castro-Tirado, Josep M. Trigo-Rodríguez
Publikováno v:
Scopus-Elsevier
An impressive daylight fireball was observed from Spain, Portugal, and the south of France at 16h46m45s UTC on January 4, 2004. The meteoroid penetrated into the atmosphere, generating shock waves that reached the ground and produced audible booms. T
Autor:
Otto Eugster, Silvio Lorenzetti
Publikováno v:
Geochimica et Cosmochimica Acta. 69:2675-2685
We determined the He, Ne, and Ar isotopic abundances in the four acapulcoites Dhofar (DHO) 125, DHO 290, DHO 312, and Graves Nunataks 98028, the metal-rich diogenite Northwest Africa (NWA) 1982, and a unique achondrite, NWA 1058, that resembles the a
Autor:
Toshiko K. Mayeda, Gregory W. Kallemeyn, Silvio Lorenzetti, Monica M. Grady, Alan E. Rubin, John T. Wasson, Otto Eugster, A. B. Verchovsky, Robert N. Clayton
Publikováno v:
Geochimica et Cosmochimica Acta. 67:3283-3298
Gujba is a coarse-grained meteorite fall composed of 41 vol% large kamacite globules, 20 vol% large light-colored silicate globules with cryptocrystalline, barred pyroxene and barred olivine textures, 39 vol% dark-colored, silicate-rich matrix, and r
Publikováno v:
Scopus-Elsevier
We determined the mineralogical and chemical characteristics and the He, Ne, and Ar isotopic abundances of 2 meteorites that fell in China and of 2 meteorites that were recovered by the 15th Chinese Antarctic Research Expedition. Guangmingshan (H5),