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Origin of diamonds in the Canyon Diablo and Novo Urei meteorites

1964; American Geophysical Union; Volume: 69; Issue: 12 Linguagem: Inglês

10.1029/jz069i012p02403

2156-2202

Neville L. Carter, George C. Kennedy,

Geological and Geochemical Analysis

Journal of Geophysical Research (1896-1977)Volume 69, Issue 12 p. 2403-2421 Origin of diamonds in the Canyon Diablo and Novo Urei meteorites Neville L. Carter, Neville L. CarterSearch for more papers by this authorGeorge C. Kennedy, George C. KennedySearch for more papers by this author Neville L. Carter, Neville L. CarterSearch for more papers by this authorGeorge C. Kennedy, George C. KennedySearch for more papers by this author First published: 15 June 1964 https://doi.org/10.1029/JZ069i012p02403Citations: 27AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Detailed optical studies of the textural features of several hundred diamonds and associated phases in three specimens of the Canyon Diablo meteorite and one specimen of the Novo Urei achondrite were made. Diamonds in the Canyon Diablo are associated exclusively with troilite, graphite, and schreibersite, and they occur both in shock-heated and unreheated specimens. Diamonds in the Novo Urei occur in pods and lenses interstitial to slightly deformed olivine and pyroxene crystals. The diamonds, once formed, were shattered and partially graphitized. X-ray and electron microscope studies show that the diamond bodies, which range in size up to 2 mm in Canyon Diablo, are now composed of 0.5-μ subindividuals with nearly random orientations. The evidence obtained from these studies indicates that the diamonds probably precipitated as a stable phase from a late-freezing residuum composed primarily of iron sulfide, iron phosphide, and carbon, under high gravitational pressures. The diamonds were subsequently shattered, distorted, and partially graphitized, possibly from a pressure drop due to the disruption of the large parent body. The physical evidence against the theory that the diamonds originated by high temperature and pressures due to shock is convincing. References Aust, R. B., H. G. Drickamer, A new crystalline phase of carbon, Science, 140, 817–819, 1963. Bailey, S. W., R. A. Bell, C. J. Peng, Plastic deformation of quartz in nature, Bull. Geol. Soc. Am., 69, 1443–1466, 1958. Cahn, R. W., Slip and polygonization in aluminum, J. Inst. Metals, 79, 128–129, 1951. Carter, N. L., J. M. Christie, D. T. Griggs, Experimental deformation and recrystallization of quartz, J. Geol., 1964. Christie, J. M., D. T. Griggs, N. L. 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