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Ito GT, Lin J. Mantle temperature anomalies along the past and paleoaxes of the Galápagos spreading center as inferred from gravity analyses. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/94jb02594] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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White WM, McBirney AR, Duncan RA. Petrology and geochemistry of the Galápagos Islands: Portrait of a pathological mantle plume. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/93jb02018] [Citation(s) in RCA: 300] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Wilson DS, Hey RN. History of rift propagation and magnetization intensity for the Cocos-Nazca sspreading Center. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/95jb00762] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mahoney JJ, Natland JH, White WM, Poreda R, Bloomer SH, Fisher RL, Baxter AN. Isotopic and geochemical provinces of the western Indian Ocean Spreading Centers. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb094ib04p04033] [Citation(s) in RCA: 246] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Nicholls H. Hopes rise as head named for troubled conservation centre. Nature 2005; 433:448. [PMID: 15690004 DOI: 10.1038/433448b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kopp H, Kopp C, Phipps Morgan J, Flueh ER, Weinrebe W, Morgan WJ. Fossil hot spot-ridge interaction in the Musicians Seamount Province: Geophysical investigations of hot spot volcanism at volcanic elongated ridges. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jb002015] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- H. Kopp
- GEOMAR Research Center for Marine Geosciences; Kiel Germany
| | - C. Kopp
- GEOMAR Research Center for Marine Geosciences; Kiel Germany
| | | | - E. R. Flueh
- GEOMAR Research Center for Marine Geosciences; Kiel Germany
| | - W. Weinrebe
- GEOMAR Research Center for Marine Geosciences; Kiel Germany
| | - W. J. Morgan
- Department of Geosciences; Princeton University; Princeton New Jersey USA
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Bruguier NJ, Minshull TA, Brozena JM. Morphology and tectonics of the Mid-Atlantic Ridge, 7°-12°S. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2001jb001172] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - T. A. Minshull
- Southampton Oceanography Centre; Southampton United Kingdom
| | - J. M. Brozena
- Marine Geosciences Division; Naval Research Laboratory; Washington District of Columbia USA
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Isotopic evidence for Late Cretaceous plume-ridge interaction at the Hawaiian hotspot. Nature 2000; 405:673-6. [PMID: 10864321 DOI: 10.1038/35015057] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
When a mantle plume interacts with a mid-ocean ridge, both are noticeably affected. The mid-ocean ridge can display anomalously shallow bathymetry, excess volcanism, thickened crust, asymmetric sea-floor spreading and a plume component in the composition of the ridge basalts. The hotspot-related volcanism can be drawn closer to the ridge, and its geochemical composition can also be affected. Here we present Sr-Nd-Pb isotopic analyses of samples from the next-to-oldest seamount in the Hawaiian hotspot track, the Detroit seamount at 51 degrees N, which show that, 81 Myr ago, the Hawaiian hotspot produced volcanism with an isotopic signature indistinguishable from mid-ocean ridge basalt. This composition is unprecedented in the known volcanism from the Hawaiian hotspot, but is consistent with the interpretation from plate reconstructions that the hotspot was located close to a mid-ocean ridge about 80 Myr ago. As the rising mantle plume encountered the hot, low-viscosity asthenosphere and hot, thin lithosphere near the spreading centre, it appears to have entrained enough of the isotopically depleted upper mantle to overwhelm the chemical characteristics of the plume itself. The Hawaiian hotspot thus joins the growing list of hotspots that have interacted with a rift early in their history.
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Allan JF, Simkin T. Fernandina Volcano's evolved, well-mixed basalts: Mineralogical and petrological constraints on the nature of the Galapagos plume. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jb900417] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Vlastélic I, Dosso L, Bougault H, Aslanian D, Géli L, Etoubleau J, Bohn M, Joron JL, Bollinger C. Chemical systematics of an intermediate spreading ridge: The Pacific-Antarctic Ridge between 56°S and 66°S. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jb900234] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Schilling JG, Kingsley R, Fontignie D, Poreda R, Xue S. Dispersion of the Jan Mayen and Iceland mantle plumes in the Arctic: A He-Pb-Nd-Sr isotope tracer study of basalts from the Kolbeinsey, Mohns, and Knipovich Ridges. ACTA ACUST UNITED AC 1999. [DOI: 10.1029/1999jb900057] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Douglass J, Schilling JG, Fontignie D. Plume-ridge interactions of the Discovery and Shona mantle plumes with the southern Mid-Atlantic Ridge (40°-55°S). ACTA ACUST UNITED AC 1999. [DOI: 10.1029/98jb02642] [Citation(s) in RCA: 128] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kingsley RH, Schilling JG. Plume-ridge interaction in the Easter-Salas y Gomez seamount chain-Easter Microplate system: Pb isotope evidence. ACTA ACUST UNITED AC 1998. [DOI: 10.1029/98jb01496] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ito G, Lin J, Gable CW. Interaction of mantle plumes and migrating mid-ocean ridges: Implications for the Galápagos plume-ridge system. ACTA ACUST UNITED AC 1997. [DOI: 10.1029/97jb01049] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Hanan BB, Graham DW. Lead and Helium Isotope Evidence from Oceanic Basalts for a Common Deep Source of Mantle Plumes. Science 1996; 272:991-5. [PMID: 8662585 DOI: 10.1126/science.272.5264.991] [Citation(s) in RCA: 365] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Linear arrays in lead isotope space for mid-ocean ridge basalts (MORBs) converge on a single end-member component that has intermediate lead, strontium, and neodymium isotope ratios compared with the total database for oceanic island basalts (OIBs) and MORBs. The MORB data are consistent with the presence of a common mantle source region for OIBs that is sampled by mantle plumes. 3He/4He ratios for MORBs show both positive and negative correlation with the 206Pb/204Pb ratios, depending on the MORB suite. These data suggest that the common mantle source is located in the transition zone region. This region contains recycled, oceanic crustal protoliths that incorporated some continental lead before their subduction during the past 300 to 2000 million years.
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Affiliation(s)
- BB Hanan
- B. B. Hanan, Department of Geological Sciences, San Diego State University, San Diego, CA 92182-1020, USA. D. W. Graham, College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331-5503, USA
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Graham DW, Christie DM, Harpp KS, Lupton JE. Mantle Plume Helium in Submarine Basalts from the Galápagos Platform. Science 1993; 262:2023-6. [PMID: 17794969 DOI: 10.1126/science.262.5142.2023] [Citation(s) in RCA: 97] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Helium-3/helium-4 ratios in submarine basalt glasses from the Galapagos Archipelago range up to 23 times the atmospheric ratio in the west and southwest. These results indicate the presence of a relatively undegassed mantle plume at the Galápagos hot spot and place Galápagos alongside Hawaii, Iceland, and Samoa as the only localities known to have such high helium-3/helium-4 ratios. Lower ratios across the rest of the Galápagos Archipelago reflect systematic variations in the degree of dilution of the plume by entrainment of depleted material from the asthenosphere. These spatial variations reveal the dynamics of the underlying mantle plume and its interaction with the nearby Galápagos Spreading Center.
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Schilling JG, Kingsley RH, Hanan BB, McCully BL. Nd-Sr-Pb isotopic variations along the Gulf of Aden: Evidence for Afar Mantle Plume-Continental Lithosphere Interaction. ACTA ACUST UNITED AC 1992. [DOI: 10.1029/92jb00415] [Citation(s) in RCA: 204] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Juster TC, Grove TL, Perfit MR. Experimental constraints on the generation of FeTi basalts, andesites, and rhyodacites at the Galapagos Spreading Center, 85°W and 95°W. ACTA ACUST UNITED AC 1989. [DOI: 10.1029/jb094ib07p09251] [Citation(s) in RCA: 187] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yonover RN, Sinton JM, Sommer MA, Gibson EK. C-O-H ratios of silicate melt inclusions in basalts from the Galapagos Spreading Center near 95 degrees W: a laser decrepitation mass spectrometry study. GEOCHIMICA ET COSMOCHIMICA ACTA 1989; 53:3145-3154. [PMID: 11539782 DOI: 10.1016/0016-7037(89)90095-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Volatile ratios (primarily of H2O and CO2) in individual silicate melt (glass) inclusions in minerals have been analyzed using laser volatilization and mass spectrometry. A Nd-glass laser was used to produce 50-micrometer diameter pits in silicate melt inclusions. Released volatiles were analyzed directly with a computer-controlled quadrupole mass spectrometer. The detection limits for CO2 and H2O were on the order of 3 x 10(-14) and 3 x 10(-13) moles, respectively. The reproducibility for CO2/H2O was better than +/- 9%. The total range of volatile ratios from vitreous silicate glass inclusions contained in a suite of Galapagos lavas were: 0.018 to 1.193 for CO2/H2O; 0.002 to 0.758 for CO/H2O; 0 to 0.454 for CH4/H2O; and 0 to 0.432 for Ar/H2O. The mean CO2/H2O from the propagating rift (0.245 +/- 0.068) silicate glass inclusions is significantly lower than that of the actively failing rift (0.641 +/- 0.241); this difference probably reflects different degrees of degassing during magmatic histories for the two regions. Relatively undifferentiated failing rift magmas must have relatively short crustal residence times prior to eruption and, therefore, have not undergone significant degassing of CO2, as would appear to be the case for the more highly fractionated propagating rift magmas. The laser-mass spectrometric system described herein has the ability to act as a point-source probing device that can differentiate between the various volatile sites in minerals and rocks (as well as synthetic materials) on a micrometer scale.
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Affiliation(s)
- R N Yonover
- Hawaii Institute of Geophysics, University of Hawaii at Manoa, Honolulu 96822, USA
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Geist DJ, White WM, McBirney AR. Plume-asthenosphere mixing beneath the Galapagos archipelago. Nature 1988. [DOI: 10.1038/333657a0] [Citation(s) in RCA: 97] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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White WM, Hofmann AW, Puchelt H. Isotope geochemistry of Pacific Mid-Ocean Ridge Basalt. ACTA ACUST UNITED AC 1987. [DOI: 10.1029/jb092ib06p04881] [Citation(s) in RCA: 311] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hanan BB, Kingsley RH, Schilling JG. Pb isotope evidence in the South Atlantic for migrating ridge—hotspot interactions. Nature 1986. [DOI: 10.1038/322137a0] [Citation(s) in RCA: 150] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Schilling JG, Thompson G, Kingsley R, Humphris S. Hotspot—migrating ridge interaction in the South Atlantic. Nature 1985. [DOI: 10.1038/313187a0] [Citation(s) in RCA: 168] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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