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Petrofabric studies of eclogite, spinel-Websterite, and spinel-lherzolite Xenoliths from kimberlite-bearing breccia pipes in southeastern Utah and northeastern Arizona

1972; American Geophysical Union; Volume: 77; Issue: 23 Linguagem: Inglês

10.1029/jb077i023p04350

2156-2202

Herwart Helmstaedt, Orson L. Anderson, Anna T. Gavasci,

Geochemistry and Geologic Mapping

Journal of Geophysical Research (1896-1977)Volume 77, Issue 23 p. 4350-4365 Petrofabric studies of eclogite, spinel-Websterite, and spinel-lherzolite Xenoliths from kimberlite-bearing breccia pipes in southeastern Utah and northeastern Arizona Herwart Helmstaedt, Herwart HelmstaedtSearch for more papers by this authorOrson L. Anderson, Orson L. AndersonSearch for more papers by this authorAnna T. Gavasci, Anna T. GavasciSearch for more papers by this author Herwart Helmstaedt, Herwart HelmstaedtSearch for more papers by this authorOrson L. Anderson, Orson L. AndersonSearch for more papers by this authorAnna T. Gavasci, Anna T. GavasciSearch for more papers by this author First published: 10 August 1972 https://doi.org/10.1029/JB077i023p04350Citations: 102AboutPDF 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 Textural evidence, clinopyroxene fabric, and mineral assemblages of eclogite nodules from the kimberlite-bearing breccia pipes of the east Colorado plateau are consistent with an origin by metamorphic recrystallization of predominantly basic igneous rocks. The eclogites are divided into three fabric groups exhibiting linear, planar, and random fabrics. Clinopyroxenes follow similar orientation rules as amphiboles in metamorphosed crustal tectonites. Partial recrystallization of olivine and extensive postcrystalline strain in the pyroxenes of the lherzolites and the websterites are believed to be due to a modification of the original fabric under crustal conditions. The inferred structural history of the ultramafic nodules puts various constraints on petrologic models attempting to explain their origin. References Alexandrov, K. S., T. V. Ryzhova, The elastic properties of rock-forming minerals, 1, Pyroxenes and amphiboles, Bull. Acad. Sci. U.S.S.R., Geophys. Ser.9, 871–875, 1961. Alexandrov, K. S., T. V. Ryzhova, B. P. Belikov, The elastic properties of pyroxenes, Sov. Phys. Crystallogr., 8, 589–591, 1963. Avé Lallemant, H. 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