Zobrazeno 1 - 10
of 100
pro vyhledávání: '"Roger G. Burns"'
Autor:
Roger G. Burns
Publikováno v:
Perovskite: A Structure of Great Interest to Geophysics and Materials Science
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0166ce402a22edee5a9737115d5c65ab
https://doi.org/10.1029/gm045p0081
https://doi.org/10.1029/gm045p0081
Publikováno v:
Meteoritics. 30:625-633
— Mossbauer spectroscopy is a very useful tool for identifying ferric iron weathering products in meteorites because of the capability to quantify the relative amounts of ferric iron in them. Mossbauer measurements were made of 33 Antarctic H chond
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::989949b728f6d6b4d31fe31e463e710e
https://doi.org/10.1111/j.1945-5100.1995.tb01159.x
https://doi.org/10.1111/j.1945-5100.1995.tb01159.x
Autor:
Roger G. Burns
Publikováno v:
Hyperfine Interactions. 91:739-745
The variety of coordination numbers, symmetries, distortions and ligand environments in thermally-stable iron-bearing minerals provide wide ranges of chemical shift (δ) and quadrupole splitting (δ) parameters, which serve to characterize the crysta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92b051cac38417f34874118462c005fb
https://doi.org/10.1007/bf02064600
https://doi.org/10.1007/bf02064600
Autor:
Roger G. Burns, Duncan S. Fisher
Publikováno v:
Hyperfine Interactions. 91:571-576
Determination of oxidation states and the crystal chemistry of iron-bearing minerals in carbonaceous chondrites by Mossbauer spectroscopy is complicated by thermally-induced electron-hopping in cronstedtite, superparamagnetism of hydrous ferric oxide
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2617c03bdf62c1ab9dfe5e7de9985360
https://doi.org/10.1007/bf02064572
https://doi.org/10.1007/bf02064572
Autor:
Roger G. Burns
Publikováno v:
Geochimica et Cosmochimica Acta. 57:4551-4554
The topics covered with respect to chemical weathering on Mars include the following: Mars soil, mineralogy, spectroscopic analysis, clays, silicates, oxidation, iron oxides, water, chemical reactions, geochemistry, minerals, Mars atmosphere, atmosph
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a929fa2773c0aeca96bd0fcf245019a7
https://doi.org/10.1016/0016-7037(93)90181-u
https://doi.org/10.1016/0016-7037(93)90181-u
Publikováno v:
Geochimica et Cosmochimica Acta. 57:4583-4595
Spectroscopic analyses show that Fe(3+)-doped smectites prepared in the laboratory exhibit important similarities to the soils on Mars. Ferrihydrite has been identified as the interlayer ferric component in Fe(3+)-doped smectites by a low quadrupole
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::72ec83deb5716e1742e6ab62403ce57c
https://doi.org/10.1016/0016-7037(93)90184-x
https://doi.org/10.1016/0016-7037(93)90184-x
Autor:
Roger G. Burns
Publikováno v:
Geochimica et Cosmochimica Acta. 57:4555-4574
Ferric-bearing assemblages on Mars indicate that oxidative weathering of surface basalts has occurred during the evolution of the Red Planet. In aqueous environments chemical weathering proceeded through stages of dissolution of Fe 2+ -bearing silica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7be635acb1b98e6ef8fa3ee8dce97ed9
https://doi.org/10.1016/0016-7037(93)90182-v
https://doi.org/10.1016/0016-7037(93)90182-v
Autor:
Roger G. Burns
Publikováno v:
Mineralogical Applications of Crystal Field Theory. :470-474
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ddaf4d7115cd218f35c52abab7f67f9
https://doi.org/10.1017/cbo9780511524899.020
https://doi.org/10.1017/cbo9780511524899.020
Autor:
Marilyn M. Lindstrom, Ludolf Schultz, E. S. Michlovich, S. Vogt, Derek W. G. Sears, John F. Wacker, Duncan S. Fisher, Cecilia Satterwhite, T. Loeken, David W. Mittlefehldt, P. Scherer, Michael E. Zolensky, Michael E. Lipschutz, Roger G. Burns, Paul H. Benoit, Stephen F. Wolf, R.T. Dodd
Publikováno v:
Meteoritics. 28:528-537
The Noblesville meteorite is a genomict, regolith breccia (H6 clasts in H4 matrix). Moessbauer analysis confirms that Noblesville is unusually fresh, not surprising in view of its recovery immediately after its fall. It resembles 'normal' H4-6 chondr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::24f160b7dcbd14b04e48e715101b0efc
https://doi.org/10.1111/j.1945-5100.1993.tb00276.x
https://doi.org/10.1111/j.1945-5100.1993.tb00276.x
Autor:
Duncan S. Fisher, Roger G. Burns
Publikováno v:
Journal of Geophysical Research: Planets. 98:3365-3372
A model of acid weathering is proposed for the iron-rich basalts on Mars. Aqueous oxidation of iron sulfides released SO4(2-) and H(+) ions that initiated the dissolution of basaltic ferromagnesian silicates and released Fe(2+) ions. The Fe(2+) ions
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cbcae8d7a096d8d5d0fb87523b0ddcf2
https://doi.org/10.1029/92je02055
https://doi.org/10.1029/92je02055