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Geldmacher, J.; Hanan, B. B.; Blichert-Toft, J.; Harpp, K.; Hoernle, K.; Hauff, F.; Werner, R.; Kerr, Andrew (2003)
Publisher: American Geophysical Union.
Languages: English
Types: Article
Subjects:
We report Hf isotope compositions of 79 lavas that record the early (�5–95 Ma) history of the\ud Gala´pagos plume volcanism. These include lavas from the Caribbean Large Igneous Province (CLIP;\ud �95–70 Ma), the accreted Gala´pagos paleo-hot spot track terranes (54–65 Ma) of Costa Rica (Quepos,\ud Osa and Burica igneous complexes), and the Gala´pagos hot spot tracks (<20 Ma) located on the Pacific\ud seafloor (Cocos, Carnegie, Malpelo, and Coiba Ridges and associated seamounts). These samples have\ud previously been well characterized in terms of major and trace elements, Sr-Nd-Pb isotopes and Ar/Ar\ud ages. As a result of the relative immobility of the high field strength and rare earth elements during synand\ud post-emplacement hydrothermal activity and low-temperature alteration, combined Lu-Hf and Sm-Nd\ud isotope systematics, when used in conjunction with Pb isotopes, provide a particular powerful tool, for\ud evaluating the source compositions of ancient and submarine lavas. The combined Nd-Hf isotope data\ud suggest that three of the isotopically distinct source components found today in the Gala´pagos Islands (the\ud Floreana-like southern component, the Fernandina-like central component, and the depleted Genovesa-like\ud eastern component) were present in the CLIP already by 95–70 Ma. The fourth Pinta-like northern\ud component is first recorded at about 83–85 Ma by volcanism taking place during the transition from the\ud plume head/CLIP to plume tail stage and has then been present in the hot spot track continuously\ud thereafter. The identification of the unique northern and southern Gala´pagos Plume Hf-Nd-Pb isotope source signatures within the CLIP and the oldest hot spot track lavas provides direct evidence that the\ud CLIP represents the plume head stage of the Gala´pagos hot spot. Hafnium isotopes are consistent with the\ud possibility that two types of sediment components may have contributed to the Hf, Nd and Pb isotope\ud compositions of the Gala´pagos plume lavas. One component, characterized by D207Pb/204Pb � 0 and high\ud positive DeHf has an isotope signature indicative of relatively recently recycled pelagic sediment, a\ud signature typical of the southern Gala´pagos island Floreana. The other component has an EM like isotopic\ud composition resembling modern seafloor sediments with positive D207Pb/204Pb and lower DeHf, a\ud signature typical of the northern Gala´pagos island Pinta.
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    • Barckhausen, U., C. R. Ranero, R. von Huene, S. C. Cande, and H. A. Roeser, Revised tectonic boundaries in the Cocos plate off Costa Rica: Implications for the segmentation of the convergent margin and for plate tectonic models, J. Geophys. Res., 106, 19,207 - 19,220, 2001.
    • Bell, K., and G. R. Tilton, Nd, Pb, and Sr isotopic composition of East African carbonatites: Evidence for mantle mixing and plume inhomogeneity, J. Petrol., 42, 1927 - 1945, 2001.
    • Bellon, H., R. Saenz, and J. Tournon, K-Ar radiometric ages of lavas from Cocos Island (Eastern Pacific), Mar. Geol., 54, M17 - M23, 1983.
    • Ben Othman, D., W. M. White, and J. Patchett, The geochemistry of marine sediments, island arc magma genesis, and crust-mantle recycling, Earth Planet. Sci. Lett., 94, 1 - 21, 1989.
    • Blichert-Toft, J., and W. M. White, Hf isotope geochemistry of the Gala´pagos islands, Geochem. Geophys. Geosyst., 2, Paper number 2000GC000138, 2001.
    • Blichert-Toft, J., C. Chauvel, and F. Albare`de, Separation of Hf and Lu for high-precision isotope analysis of rock samples by magnetic sector-multiple collector ICP-MS, Contrib. Mineral. Petrol., 127, 248 - 260, 1997.
    • Blichert-Toft, J., F. Frey, and F. Albarede, Hf isotope evidence for pelagic sediments in the source of Hawaiian basalts, Science, 285, 879 - 882, 1999.
    • Castillo, P., R. Batiza, D. Vanko, E. Malavassi, J. Barquero, and E. Fernandez, Anomalously young volcanoes on hotspot traces: I. Geology and petrology of Cocos Island, Geol. Soc. Am. Bull., 100, 1400 - 1414, 1988.
    • Chauvel, C., and J. Blichert-Toft, A hafnium isotope and trace element perspective on melting of the depleted mantle, Earth Planet. Sci. Lett., 190, 137 - 151, 2001.
    • Cousens, B. L., J. Blenkinsop, and J. M. Franklin, Lead isotope systematics of sulfide minerals in the Middle Valley hydrothermal system, northern Juan de Fuca Ridge, Geochem. Geophys. Geosyst., 3(5), 1029, doi:10.1029/2001GC000257, 2002.
    • Donnelly, T. W., K. Melson, R. Kay, and J. J. W. Rogers, Basalts and Dolerits of Late Cretaceous age from the Central Caribbean, Initial Rep. Deep Sea Drill. Proj., 15, 989 - 1012, 1973.
    • Duncan, R. A., and R. B. Hargraves, Caribbean region in the mantle reference frame, in The Caribbean-South American Plate Boundary and Regional Tectonics, edited by W. Bonini et al., Geol. Soc. Am. Mem., 162, 89 - 121, 1984.
    • Farley, K. A., J. H. Natland, and H. Craig, Binary mixing of enriched and undegassed (primitive?) mantle components (He, Sr, Nd, Pb) in Samoan lavas, Earth Planet. Sci. Lett., 111, 183 - 199, 1992.
    • Geist, J. D., W. M. White, and A. R. McBirney, Plume-asthenosphere mixing beneath the Gala´pagos archipelago, Nature, 333, 657 - 660, 1988.
    • Graham, D. W., D. M. Christie, K. S. Harpp, and J. E. Lupton, Mantle plume helium in submarine basalts from the Gala´pagos Platform, Science, 262, 2023 - 2026, 1993.
    • Hanan, B. B., and D. W. Graham, Lead and helium isotope evidence from oceanic basalts for a common deep source of mantle plumes, Science, 272, 991 - 995, 1996.
    • Hanan, B. B., R. H. Kingsley, and J.-G. Schilling, Migrating ridge - Hotspot Interactions: Pb isotope evidence in the South Atlantic, Nature, 322, 137 - 144, 1986.
    • Hanan, B. B., J. Blichert-Toft, R. Kingsley, and J.-G. Schilling, Depleted Iceland mantle plume geochemical signature: Artifact of multicomponent mixing?, Geochem. Geophys. Geosyst., 1, Paper number 1999GC000009, 2000.
    • Handschumacher, D. W., Post-Eocene plate tectonics of the eastern Pacific, in The Geophysics of the Pacific Ocean Basin and Its Margin, Geophys. Monogr. Ser., vol. 19, edited by G. H. Sutton, M. H. Manghnani, and R. Moberly, pp. 177 - 202, AGU, Washington, D. C., 1976.
    • Harpp, K. S., and W. M. White, Tracing a mantle plume: Isotopic and trace element variations of Gala´pagos seamounts, Geochem. Geophys. Geosyst., 2, Paper number 2000GC000137, 2001.
    • Hart, S. R., A large scale isotope anomaly in the Southern Hemisphere mantle, Nature, 309, 753 - 757, 1984.
    • Hart, S. R., E. H. Hauri, L. A. Oschmann, and J. A. Whitehead, Mantle plumes and entrainment: Isotopic evidence, Science, 256, 517 - 520, 1992.
    • Hauff, F., K. Hoernle, H.-U. Schmincke, and R. Werner, A Mid cretaceous origin for the Gala´pagos hotspot: Volcanological, petrological, and geochemical evidence from Costa Rican oceanic crustal segments, Geol. Rundschau, 86, 141 - 155, 1997.
    • Hauff, F., K. Hoernle, P. v. d. Bogaard, G. Alvarado, and D. und Garbe-Scho¨nberg, Age and geochemsitry of basaltic complexes in western Costa Rica: Contributions to the geotectonic evolution of Central America, Geochem. Geophys. Geosyst., 1, Paper number 1999GC000020, 2000a.
    • Hauff, F., K. Hoernle, G. Tilton, D. Graham, and A. C. Kerr, Large volume recycling of oceanic lithosphere over short time scales: Geochemical constraints from the Caribbean Large Igneous Province, Earth Planet. Sci. Lett., 174, 247 - 263, 2000b.
    • Hauff, F., R. Werner, D. M. Christie, and K. Hoernle, Morphological and Sr-Nd-Pb isotope variations along the CocosNazca Spreading Center (CNS) from 85 W to 92.5 W, Eur. J. Mineral., 14, 64, 2002.
    • Hey, R., F. K. Duennebier, and W. J. Morgan, Propagating rifts on Midocean Ridges, J. Geophys. Res., 85, 3647 - 3658, 1980.
    • Hoernle, K., R. Werner, J. P. Morgan, J. Bryce, and J. Mrazek, Existence of complex spatial zonation in the Gala´pagos Plume for at least 14 m. y., Geology, 28, 435 - 438, 2000.
    • Hoernle, K., P. V. d. Bogaard, R. Werner, B. Lissinna, F. Hauff, G. Alvarado, and D. Garbe-Scho¨nberg, Missing history (16 - 71 Ma) of the Gala´pagos Hotspot: Implications for the tectonic and biological evolution of the Americas, Geology, 30, 795 - 798, 2002a.
    • Hoernle, K., G. Tilton, M. J. Le Bas, S. Duggen, and D. GarbeScho¨nberg, Geochemistry of oceanic carbonatites compared with continental carbonatites: Mantle recycling of oceanic crustal carbonate, Contrib. Mineral. Petrol., 142, 520 - 542, 2002b.
    • Ionov, D., Trace element composition of mantle-derived carbonates and coexisting phases in peridotite xenoliths from alkali basalts, J. Petrol., 39, 1931 - 1941, 1998.
    • Kerr, A. C., J. Tarney, G. F. Marriner, G. T. Klaver, A. D. Saunders, and M. F. Thirlwall, The geochemistry and petrogenesis of the late-Cretaceous picrites and basalts of Curac¸ao, Netherlands Antilles: A remnant of an oceanic plateau, Contrib. Mineral. Petrol., 124, 29 - 43, 1996.
    • Kerr, A. C., J. Tarney, G. F. Marriner, A. Nivia, and A. D. Saunders, The Caribbean-Colombian Igneous Province: The internal anatomy of an oceanic plateau, in Large Igneous Provinces, Geophys. Monogr. Ser., vol. 100, edited by J. Mahoney and M. F. Coffin, pp. 123 - 144, AGU, Washington, D. C., 1997a.
    • Kerr, A. C., G. F. Marriner, J. Tarney, A. Nivia, A. D. Saundrs, M. F. Thirwall, and C. W. Sinton, Cretaceous basaltic terranes in Western Colombia: Elemental, chronological and Sr-Nd isotopic constraints on petrogenesis, J. Petrol., 38, 677 - 702, 1997b.
    • Kerr, A. C., J. Tarney, P. D. Kempton, P. Spadea, A. Nivia, G. F. Marriner, and R. A. Duncan, Pervasive mantle plume head heterogeneity: Evidence from the late Cretaceous Caribbean-Colombian oceanic plateau, J. Geophys. Res., 107(B7), 2140, doi:10.1029/2001JB000790, 2002.
    • Kurz, M. D., and D. J. Geist, Dynamics of the Gala´pagos hotspot from helium isotope gechemistry, Geochim. Cosmochim. Acta, 63, 4139 - 4156, 1999.
    • geldmacher et al.: hafnium isotopic variations Meschede, M., U. Barckhausen, and H.-U. Worm, Extinct spreading on the Cocos Ridge, Terra Nova, 10, 211 - 216, 1998.
    • Patchett, P. J., W. M. White, H. Feldmann, S. Kielinczuk, and A. W. Hofmann, Hafnium/rare earth element fractionation in the sedimentary system and crustal recycling into the Earth's mantle, Earth Planet. Sci. Lett., 69, 365 - 378, 1984.
    • Pindel, J. L., and S. F. Barrett, Geological Evolution of the Caribbean region, a plate tectonic perspective, in The Caribbean Region, Geol. Soc. Am., 405 - 432, 1990.
    • Planck, T., and C. H. Langmuir, The chemical composition of subducting sediment and it's consequences for the crust and mantle, Chem. Geol., 145, 325 - 394, 1998.
    • Richards, M. A., R. A. Duncan, and V. E. Courtillot, Flood basalts and hotspot tracks: Plume heads and tails, Science, 246, 103 - 107, 1989.
    • Salters, V. J. M., and S. R. Hart, The hafnium paradox and the role of garnet in the source of mid-ocean-ridge basalts, Nature, 342, 420 - 422, 1989.
    • Salters, V. J. M., and S. R. Hart, The mantle source of ocean ridges, islands and arcs: The Hf isotope connection, Earth Planet. Sci. Lett., 104, 364 - 380, 1991.
    • Sinton, C. W., R. A. Duncan, and P. Denyer, Nicoya Peninsula, Costa Rica: A single suite of Caribbean oceanic plateau magmas, J. Geophys. Res., 102, 15,507 - 15,520, 1997.
    • Sinton, C. W., R. A. Duncan, M. Storey, J. Lewis, and J. J. Estrada, An oceanic flood basalt province within the Caribbean plate, Earth Planet. Sci. Lett., 155, 221 - 235, 1998.
    • Sun, S. S., and W. F. McDonough, Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes, in Magmatism in the Ocean Basins, Spec. Publ. Geol. Soc. Am., 42, 313 - 345, 1989.
    • Toomey, D. R., E. E. E. Hooft Toomey, S. C. Solomon, D. E. James, and M. L. Hall, Upper mantle structure beneath the Gala´pagos archipelago from body wave data (abstract), Eos Trans. AGU, 82(47), Fall Meet. Suppl., Abstract T41D-04, 2001.
    • Vervoort, J. D., P. J. Patchett, J. Blichert-Toft, and F. Albare`de, Relationships between Lu-Hf and Sm-Nd isotopic systems in the global sedimentary system, Earth Planet. Sci. Lett., 168, 79 - 99, 1999.
    • Werner, R., K. Hoernle, P. v. d. Bogaard, C. Ranero, R. v. Huene, and D. Korich, A drowned 14 Ma old Gala´pagos Archipelago off the coast of Costa Rica: Implications for evolutionary and tectonic models, Geology, 27, 499 - 502, 1999 .
    • White, W. M., and A. W. Hofmann, Geochemistry of the Ga´- lapagos Islands: Implications for mantle dynamics and evolution, Yearbook Carnegie Inst., 77, 596 - 606, 1978.
    • White, W. M., A. R. McBirney, and R. A. Duncan, Petrology and geochemistry of the Gala´pagos Islands: Portrait of a pathological mantle plume, J. Geophys. Res., 98, 19,533 - 19,563, 1993.
    • Wilson, D. S., and R. N. Hey, History of rift propagation and magnetization intensity for the Cocos-Nazca spreading center, J. Geophys. Res., 100, 10,041 - 10,056, 1995.
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