Oxidation states of the upper mantle recorded by megacryst ilmenite in kimberlite and type A and B spinel lherzolites
dc.contributor.author | Dawson, J. B. | en_US |
dc.contributor.author | Arculus, Richard J. | en_US |
dc.contributor.author | Gust, D. A. | en_US |
dc.contributor.author | Holmes, R. D. | en_US |
dc.contributor.author | Mitchell, R. H. | en_US |
dc.date.accessioned | 2006-09-11T18:51:39Z | |
dc.date.available | 2006-09-11T18:51:39Z | |
dc.date.issued | 1984-01 | en_US |
dc.identifier.citation | Arculus, R. J.; Dawson, J. B.; Mitchell, R. H.; Gust, D. A.; Holmes, R. D.; (1984). "Oxidation states of the upper mantle recorded by megacryst ilmenite in kimberlite and type A and B spinel lherzolites." Contributions to Mineralogy and Petrology 85(1): 85-94. <http://hdl.handle.net/2027.42/47337> | en_US |
dc.identifier.issn | 0010-7999 | en_US |
dc.identifier.issn | 1432-0967 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/47337 | |
dc.description.abstract | The intrinsic oxygen fugacities of homogeneous, inclusion-free, megacryst ilmenites from the Frank Smith, Excelsior, Sekameng and Mukorob kimberlite pipes in southern Africa, and the alnöitic breccia in the Solomon Islands have been determined. Similar measurements have been made of the type A and B spinel peridotites from San Carlos in Arizona. The type A peridotites are characterised by oxygen fugacities close to the iron-wüstite buffer, similar to those of equivalent peridotite specimens from other continental and island arc environments. In strong contrast, the type B peridotites and all of the ilmenite megacrysts range between the oxygen fugacities defined by the nickelnickel oxide and fayalite-magnetite-quartz buffers. A close relationship between type B peridotites, oxidized metasomatizing fluids in the upper mantle and oxidized, silicaundersaturated magma types is suggested. It is unlikely that a solid elemental carbon phase can be an equilibrium crystallization product of kimberlite magmas if the ilmenite megacrysts represent the redox state of kimberlite melts. The ultimate source of the oxidizing fluids and the development of such a wide dispersion (>4 orders of magnitude) in oxygen fugacities of the upper mantle is not clear, but may involve recycled lithosphere, fluids from the lower mantle or result from the relatively rapid diffusion of H 2 , compared with other potential volatile species, in the mantle. | en_US |
dc.format.extent | 956000 bytes | |
dc.format.extent | 3115 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Springer-Verlag | en_US |
dc.subject.other | Mineralogy | en_US |
dc.subject.other | Geology | en_US |
dc.subject.other | Mineral Resources | en_US |
dc.subject.other | Geosciences | en_US |
dc.title | Oxidation states of the upper mantle recorded by megacryst ilmenite in kimberlite and type A and B spinel lherzolites | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Geology and Earth Sciences | en_US |
dc.subject.hlbsecondlevel | Chemistry | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Research School of Earth Sciences, Australian National University, P.O. Box 4, 2600, Canberra, A.C.T., Australia; Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, 48109, Ann Arbor, Michigan, USA | en_US |
dc.contributor.affiliationother | Research School of Earth Sciences, Australian National University, P.O. Box 4, 2600, Canberra, A.C.T., Australia | en_US |
dc.contributor.affiliationother | Geology Department, Lakehead University, P7B 5E1, Thunder Bay, Ontario, Canada | en_US |
dc.contributor.affiliationother | Research School of Earth Sciences, Australian National University, P.O. Box 4, 2600, Canberra, A.C.T., Australia | en_US |
dc.contributor.affiliationother | Department of Geology, University of Sheffield, S13JD, Sheffield, UK | en_US |
dc.contributor.affiliationumcampus | Ann Arbor | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/47337/1/410_2004_Article_BF00380225.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1007/BF00380225 | en_US |
dc.identifier.source | Contributions to Mineralogy and Petrology | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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