Hydrothermal scavenging on the Juan de Fuca Ridge: 23OThxs, 10Be, and REEs in ridge-flank sediments
Identifieur interne : 00CD98 ( Main/Exploration ); précédent : 00CD97; suivant : 00CD99Hydrothermal scavenging on the Juan de Fuca Ridge: 23OThxs, 10Be, and REEs in ridge-flank sediments
Auteurs : C. R. German [Royaume-Uni] ; D. L. Bourlés [France] ; E. T. Brown [France, États-Unis] ; J. Hergt [Australie] ; S. Colley [Royaume-Uni] ; N. C. Higgs [Royaume-Uni] ; E. M. Ludford [Royaume-Uni] ; T. A. Nelsen [États-Unis] ; R. A. Feely [États-Unis] ; G. Raisbeck [France] ; F. Yiou [France]Source :
- Geochimica et Cosmochimica Acta [ 0016-7037 ] ; 1997.
English descriptors
- KwdEn :
- Acta, Background samples, Biogenic, Caco3, Cleft, Cleft segment, Constant sediment accumulation, Continental eolian input, Core basis, Core depth, Cosmochim, Deeper horizon, Detrital concentration, Detrital eolian component, Distribution patterns, Distribution patterns exhibit, Earth planet, Embley, Enrichment, Excess hydrothermal component, Exhibit ratios, Feely, Fuca, Fuca ridge, Geochim, Geophys, Godfrey, Highest ratios, Hydrothermal, Hydrothermal activity, Hydrothermal discharge, Hydrothermal input, Hydrothermal plume, Hydrothermal plumes, Hydrothermal processes, Hydrothermal sediments, Isotope, Isotope concentrations, Isotope distributions, Isotope measurements, Isotopic, Isotopic composition, Isotopic compositions, Isotopic ratios, Kyte, Lett, Massoth, Metal peaks, Metalliferous sediments, More radiogenic, Nazca plate, Nonradiogenic values, Northern cleft segment, Oceanic, Overlying water column, Pacific clays, Pacific ocean, Pacific ocean values, Pacific sediments, Particle recycling, Plume, Previous work, Radiogenic, Rare earth elements, Rees, Same samples, Seawater, Sediment, Sediment accumulation rate, Sediment core, Sulfide, Unsupported activities, Upper portion, Water depth.
- Teeft :
- Acta, Background samples, Biogenic, Caco3, Cleft, Cleft segment, Constant sediment accumulation, Continental eolian input, Core basis, Core depth, Cosmochim, Deeper horizon, Detrital concentration, Detrital eolian component, Distribution patterns, Distribution patterns exhibit, Earth planet, Embley, Enrichment, Excess hydrothermal component, Exhibit ratios, Feely, Fuca, Fuca ridge, Geochim, Geophys, Godfrey, Highest ratios, Hydrothermal, Hydrothermal activity, Hydrothermal discharge, Hydrothermal input, Hydrothermal plume, Hydrothermal plumes, Hydrothermal processes, Hydrothermal sediments, Isotope, Isotope concentrations, Isotope distributions, Isotope measurements, Isotopic, Isotopic composition, Isotopic compositions, Isotopic ratios, Kyte, Lett, Massoth, Metal peaks, Metalliferous sediments, More radiogenic, Nazca plate, Nonradiogenic values, Northern cleft segment, Oceanic, Overlying water column, Pacific clays, Pacific ocean, Pacific ocean values, Pacific sediments, Particle recycling, Plume, Previous work, Radiogenic, Rare earth elements, Rees, Same samples, Seawater, Sediment, Sediment accumulation rate, Sediment core, Sulfide, Unsupported activities, Upper portion, Water depth.
Abstract
Abstract: We have investigated the geochemistry of a hydrothermally enriched sediment core recovered from the western flank of the N.Cleft Segment, Juan de Fuca Ridge, ∼8km west of the “MegaPlume” area previously identified near 45°N. The core contains varying biogenic, lithogenic, and hydrothermal components, as reflected in CaCO3, Al, and Fe contents, respectively. Horizons of pronounced hydrothermal input, in core-top sediments and at depth, exhibit increased concentrations of Fe, Cu, Zn, and Pb and shifts in Pb isotopic compositions toward nonradiogenic (MORB/hydrothermal) values. REE concentrations co-vary with hydrothermal Fe down-core, and shale-normalised REE distribution patterns exhibit both negative Ce-anomalies and positive Eu-anomalies, indicative of input from plume-particle fall-out. Unsupported 230Thxs activities down-core are consistent with continuous slow sediment accumulation rates of 0.54 cm/ky for ∼200 ky since the deposition of the deeper Fe-rich horizon. 10Be(0) and 9Be isotope concentrations also co-vary with hydrothermal Fe down-core and exhibit 10Be(o) 9Be ratios which approach that of Pacific Ocean deep water, indicative of a seawater-scavenging source. 10Be(0) 230OThxs(0) ratios throughout most of Core GC88-6 are greater than mean Pacific Ocean values, indicating that hydrothermal scavenging can lead to significant net removal of dissolved 10Be into ridge-flank sediments.
Url:
DOI: 10.1016/S0016-7037(97)00230-5
Affiliations:
- Australie, France, Royaume-Uni, États-Unis
- Minnesota, Victoria (État)
- Melbourne
- Université de Melbourne
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<front><div type="abstract" xml:lang="en">Abstract: We have investigated the geochemistry of a hydrothermally enriched sediment core recovered from the western flank of the N.Cleft Segment, Juan de Fuca Ridge, ∼8km west of the “MegaPlume” area previously identified near 45°N. The core contains varying biogenic, lithogenic, and hydrothermal components, as reflected in CaCO3, Al, and Fe contents, respectively. Horizons of pronounced hydrothermal input, in core-top sediments and at depth, exhibit increased concentrations of Fe, Cu, Zn, and Pb and shifts in Pb isotopic compositions toward nonradiogenic (MORB/hydrothermal) values. REE concentrations co-vary with hydrothermal Fe down-core, and shale-normalised REE distribution patterns exhibit both negative Ce-anomalies and positive Eu-anomalies, indicative of input from plume-particle fall-out. Unsupported 230Thxs activities down-core are consistent with continuous slow sediment accumulation rates of 0.54 cm/ky for ∼200 ky since the deposition of the deeper Fe-rich horizon. 10Be(0) and 9Be isotope concentrations also co-vary with hydrothermal Fe down-core and exhibit 10Be(o) 9Be ratios which approach that of Pacific Ocean deep water, indicative of a seawater-scavenging source. 10Be(0) 230OThxs(0) ratios throughout most of Core GC88-6 are greater than mean Pacific Ocean values, indicating that hydrothermal scavenging can lead to significant net removal of dissolved 10Be into ridge-flank sediments.</div>
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