Výsledky vyhledávání - "H. O. A. Meyer"

Diamonds from Minas Gerais, Brazil: An Update on Sources, Origin, and Production

Autor: Mario Luiz de Sá Carneiro Chaves, H. O. A. Meyer, Joachim Karfunkel, Darcy P. Svisero

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

The State of Minas Gerais (MG) was the main diamond producer worldwide for almost 150 years. Today, Brazil contributes about 1.5% to the world diamond production, with 220,000 carats (ct) coming from MG; the two principal source areas are located in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f528b755518db8cc9002e6742130b93
https://doi.org/10.1080/00206819409465502

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Phlogopit in kalk-alkalischen lamprophyren von Nord-England

Autor: Roger H. Mitchell, S. Jayaganapathy, H. O. A. Meyer

Publikováno v: Mineralogy and Petrology. 51:227-237

Phlogopite mica is the major unaltered phase in minette and kersantite dikes in the Cross Fell and Taythes inliers in northwestern England. The compositional zonation trend in the micas from Mg-rich, Cr-bearing cores to Fe, Ti, Ba-rich, low Cr margin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1d654b0b4b79eb1a55258f29a2207162
https://doi.org/10.1007/bf01159728

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Crustal and upper mantle stratigraphy beneath eastern Kansas

Autor: H. O. A. Meyer, D. G. Brookins

Publikováno v: Geophysical Research Letters. 1:269-272

The kimberlites of Riley County, Kansas contain xenoliths of upper mantle and crustal rocks. The kimberlite probably originated below the Low Velocity Zone (LVZ). Deep seated xenoliths include ilmenite-pyroxene symplectites, lherzolite, and eclogite.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::07d0fc15f72b2b4d405ac8f2d5a8b20b
https://doi.org/10.1029/gl001i006p00269

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REVISION OF THE STRATIGRAPHY OF THE PERMIAN EVAPORITES AND ASSOCIATED STRATA IN NORTH-WESTERN ENGLAND

Autor: H. O. A. Meyer

Publikováno v: Proceedings of the Yorkshire Geological Society. 35:71-89

Summary Four evaporite beds of Permian age occur in the Vale of Eden. A correlation between the youngest, or D bed, and the Magnesian Limestone of Hilton Beck is suggested, and the stratigraphical position for the junction of the Hilton Plant Beds an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::315910156c586c3a104f6d592971c1cf
https://doi.org/10.1144/pygs.35.1.71

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Nitrogen-14 in Natural Diamonds

Autor: H. J. Milledge, H. O. A. Meyer

Publikováno v: Nature. 195:171-172

Kaiser and Bond1 showed, by mass-spectrographic analysis, that many type I diamonds contain up to 0.2 per cent of nitrogen-14 as impurity, and quantitatively correlated this fact with certain features of the type I infra-red and ultra-violet spectra.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4f2b7131e7f225de2707b962075229cd
https://doi.org/10.1038/195171a0

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Doped Synthetic Diamonds—Anomalous X-ray Spikes Along

Autor: H. O. A. Meyer, H. Judith Milledge

Publikováno v: Nature. 199:167-168

Lonsdale and Smith1 showed that type I natural diamonds give anomalous X-ray diffraction scattering along directions in reciprocal space. Hoerni and Wooster2 explained the intensities of this phenomenon in terms of impurity atoms in {100} planes, the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::20c0769e2f11aab2e344d9e76c8dd8d1
https://doi.org/10.1038/199167a0

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Diamonds: Minor elements in silicate inclusions: Pressure-temperature implications

Autor: J. W. Harris, R. L. Hervig, J. J. Gurney, Ian M. Steele, H. O. A. Meyer, Joseph V. Smith

Publikováno v: Journal of Geophysical Research. 85:6919

New electron and ion microprobe analyses of 36 olivines, 9 pyroxenes, and 10 garnets included in diamond were obtained. Olivine inclusions from kimberlites with Precambrian ages have higher mean Cr2O3 (850 versus 360 ppmw), Al2O3 (200 versus 90 ppmw)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a9b1102ac936283beb46395d87d5dfd9
https://doi.org/10.1029/jb085ib12p06919

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X-ray diffraction photographs of criented single crystals at temperatures up to 1800 C

Autor: H O A Meyer

Publikováno v: Journal of Scientific Instruments. 42:658-658

The Pt-Rh thermocouple heating-measuring device has been adapted for use on a Unicam goniometer head so that x-ray diffraction photographs of oriented single crystals can be obtained. Sliding contacts permit the crystal to be oscillated or rotated du

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0449b757cb7cd879103d7cec17647da8
https://doi.org/10.1088/0950-7671/42/8/447

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Natural Irradiation Damage in Ivory Coast Diamonds

Autor: H. J. Milledge, H. O. A. Meyer, E. Nave

Publikováno v: Nature. 206:392-392

SOME Ivory Coast diamonds lent to us by Dr. D. R. Grantham showed dark green patches over almost their entire surface. One specimen was fragmented and was found to consist of clear white diamond with a rather well-defined green skin about 0.02 mm thi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::54dc5cd0d68befc790065f59705a8633
https://doi.org/10.1038/206392a0

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