Source components of the Gran Canaria (Canary Islands) shield stage magmas : evidence from olivine composition and Sr–Nd–Pb isotopes Gurenko, Andrey A. Hoernle, Kaj A. Sobolev, Alexander V. Hauff, Folkmar Schmincke, Hans-Ulrich 2012-02-08T16:48:20Z 2012-02-08T16:48:20Z 2009-09
dc.description Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Contributions to Mineralogy and Petrology 159 (2010): 689-702, doi:10.1007/s00410-009-0448-8. en_US
dc.description.abstract The Canary Island primitive basaltic magmas 31 are thought to be derived from a HIMU-type upwelling mantle containing isotopically depleted (NMORB) component and having interacted with an enriched (EM)-type component whose origin is still a subject of debate. We have studied the relationships between Ni, Mn and Ca concentrations in olivine phenocrysts (85.6-90.0 mol.% Fo, 1722-3915 ppm Ni, 1085-1552 ppm Mn, 1222-3002 ppm Ca) from the most primitive subaerial and ODP Leg 157 high-silica (picritic to olivine basaltic) lavas with their bulk rock Sr-Nd-Pb isotope compositions (87Sr/86Sr = 0.70315- 0.70331, 143Nd/144Nd = 0.51288-0.51292, 206Pb/204Pb = 19.55-19.93, 207Pb/204Pb = 15.60- 15.63, 208Pb/204Pb = 39.31-39.69). Our data point toward the presence of both a peridotitic and a pyroxenitic component in the magma source. Using the model [Sobolev et al. (2007) The amount of recycled crust in sources of mantle-derived melts. Science 316: 412-417] in which the reaction of Si-rich melts originated during partial melting of eclogite (a high pressure product of subducted oceanic crust) with ambient peridotitic mantle forms olivine-free reaction pyroxenite, we obtain an endmember composition for peridotite with 87Sr/86Sr = 0.70337, 143Nd/144Nd = 0.51291, 206Pb/204Pb = 19.36, 207Pb/204Pb = 15.61, 208Pb/204Pb = 39.07 (EM-type endmember) and pyroxenite with 87Sr/86Sr = 0.70309, 143Nd/144Nd = 0.51289, 206Pb/204Pb = 20.03, 207Pb/204Pb = 15.62, 208Pb/204Pb = 39.84 (HIMU-type endmember). Mixing of melts from these endmembers in proportions ranging from 70% peridotite and 30% pyroxenite to 28% peridotite and 72% pyroxenite can generate the compositions of the most primitive Gran Canaria shield stage lavas. Combining our results with those from the low silica rocks from the western Canary Islands [Gurenko et al. (2009) Enriched, HIMU-type peridotite and depleted recycled pyroxenite in the Canary plume: a mixed-up mantle. EPSL 277: 514-524], at least four distinct components are required. We propose that they are (1) HIMU-type pyroxenitic component (representing recycled ocean crust of intermediate age) from the plume center, (2) HIMU-type peridotitic component (ancient recycled ocean crust stirred into the ambient mantle) from the plume margin, (3) depleted, MORB-type pyroxenitic component (young recycled oceanic crust) in the upper mantle entrained by the plume, and (4) EM-type peridotitic component from the asthenosphere or lithosphere above the plume center. en_US
dc.description.sponsorship This work was supported by the Wolfgang Paul Award of the Alexander von Humboldt Foundation (to AVS), the Max Planck Society, DFG grants SCHM 250/64, 82-1 and HA3097/2 (to HUS, KH and FH), the Russian Basic Research Foundation (grant 06-05-65234 to AVS) and the Russian Academy of Sciences. en_US
dc.format.mimetype application/
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dc.language.iso en_US en_US
dc.subject Canary Islands en_US
dc.subject Gran Canaria en_US
dc.subject ODP Leg 157 en_US
dc.subject Olivine en_US
dc.subject Mantle plume en_US
dc.subject Peridotite en_US
dc.subject Pyroxenite en_US
dc.subject Radiogenic isotopes en_US
dc.subject Ocean crust en_US
dc.subject Recycling en_US
dc.title Source components of the Gran Canaria (Canary Islands) shield stage magmas : evidence from olivine composition and Sr–Nd–Pb isotopes en_US
dc.type Preprint en_US
dspace.entity.type Publication
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