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  • 1
    Online Resource
    Online Resource
    Accretion of Extraterrestrial Matter Throughout Earth's History. (2001)
    New York, NY :Springer,
    Details
    Keywords: Geology. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (483 pages)
    Edition: 1st ed.
    ISBN: 9781441986948
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=3074385
    DDC: 551.3/97
    Language: English
    Note: Accretion of Extraterrestrial Matter Throughout Earth's History -- Editor's page -- Copyright -- Contributors -- Foreword -- Preface -- Acknowledgments -- Contents -- 1 The Origin and Properties of Dust Impacting the Earth -- 2 Sources and Orbital Evolution of Interplanetary Dust Accreted by Earth -- 3 Delivery of Material from the Asteroid Belt -- 4 The Influx of Comets and their Debris -- 5 Spacecraft Measurements of the Cosmic Dust Flux -- 6 Magnetospheric Effects on the Cosmic Dust Input into the Earth's Atmosphere -- 7 Atmospheric Entry Heating of Interplanetary Dust -- 8 Extraterrestrial Material and Stratospheric Aerosols -- 9 Glacial Cycles and Interplanetary Dust -- 10 Iridium and Osmium as Tracers of Extraterrestrial Matter in Marine Sediments -- 11 Extraterrestrial Helium in Seafloor Sediments: Identification, Characteristics, and Accretion Rate Over Geologic Time -- 12 Seeking Unbiased Collections of Modern and Ancient Micrometeorites -- 13 Cosmic Ray Exposure History of Meteorites -- 14 Terrestrial Ages of Meteorites -- 15 Quantification of Meteorite Infall Rates from Accumulations in Deserts, and Meteorite Accumulations on Mars -- 16 The Present-day Flux of Meteorites to the Earth -- 17 Fossil Meteorites -- 18 The Sedimentary Record of Impact Events -- 19 The Terrestrial Cratering Record -- 20 The Lunar Record of Recent Impact Cratering -- 21 Accretion to Earth and Moon ˜3.85 Ga -- 22 Solar System Impact Rates Measured from Lunar Spherule Ages -- Reviewers -- Index.
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    GEOMAR EBL
  • 2
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    Rhenium-osmium isotope systematics and platinum group element concentrations in oceanic crust (2012)
    Geological Society of America (GSA)
    Details
    Publication Date: 2012-03-01
    Description: Knowledge of the 187Os/188Os ratio as well as the inventories of rhenium and platinum group elements (PGE) in oceanic crust allows quantification of the proportion of recycled oceanic crust in oceanic basalt sources. Our knowledge is limited by the availability of well-characterized sections of oceanic crust, specifically of the plutonic, lower portion that has not been drilled in situ to the Moho. Here we report new data for plutonic rocks that compose the bottom 4680 m of an ocean crust section from the Oman ophiolite. Major and trace element data as well as mineral analyses indicate that Oman gabbros are primitive cumulates from melts similar to typical mid-oceanic ridge basalt. The mean weighted composition of this section (Re: 427 pg/g; Os: 55 pg/g; Ir: 182 pg/g; Pd: 2846 pg/g; Pt: 4151 pg/g; initial 187Os/188Os: 0.142) indicates significantly higher Os and lower Re concentrations than previously analyzed partial sections of ocean crust that lack cumulate lower crust [Deep Sea Drilling Project–Ocean Drilling Program (DSDP-ODP) Hole 504B, ODP Hole 735B], emphasizing that the lower, cumulate oceanic crust dominates the Os budget of oceanic crust. Analyses of mineral grain size fractions indicate that rhenium, PGE, and lead are enriched in the sulfur-rich, fine fraction. This corroborates the notion that small accessory phases, and the melt migration processes affecting them, control these elements’ budgets, distributions, and susceptibilities to alteration. The Re-Os-PGE inventories of a hypothetical 6.5-km-thick composite section that consists of 1825 m of DSDP Hole 504B-like upper oceanic crust and 4680 m of Oman-like lower ocean crust (Re: 736 pg/g; Os: 45 pg/g; Ir: 133 pg/g; Pd: 2122 pg/g; Pt: 2072 pg/g; initial 187Os/188Os: 0.146) provide a new comprehensive assessment of oceanic crust composition. Upon recycling and mixing with reasonable proportions of mantle peridotite, this composite requires at least 2 G.y. to develop sufficiently radiogenic 187Os/188Os to generate high µ (HIMU: µ = 238U/204Pb) basalts.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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    PAPER CURRENT
  • 3
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    Groundwater discharge impacts marine isotope budgets of Li, Mg, Ca, Sr, and Ba (2021)
    Nature Research
    Details
    Publication Date: 2024-02-07
    Description: Groundwater-derived solute fluxes to the ocean have long been assumed static and subordinate to riverine fluxes, if not neglected entirely, in marine isotope budgets. Here we present concentration and isotope data for Li, Mg, Ca, Sr, and Ba in coastal groundwaters to constrain the importance of groundwater discharge in mediating the magnitude and isotopic composition of terrestrially derived solute fluxes to the ocean. Data were extrapolated globally using three independent volumetric estimates of groundwater discharge to coastal waters, from which we estimate that groundwater-derived solute fluxes represent, at a minimum, 5% of riverine fluxes for Li, Mg, Ca, Sr, and Ba. The isotopic compositions of the groundwater-derived Mg, Ca, and Sr fluxes are distinct from global riverine averages, while Li and Ba fluxes are isotopically indistinguishable from rivers. These differences reflect a strong dependence on coastal lithology that should be considered a priority for parameterization in Earth-system models.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    (S2) Geochemical data for the CAA-Rivers Project Time Series at the Coppermine River, NU, collected from 2014-2016 (2019)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Keywords: Barium; CAA_Coppermine; Calcium; Canadian Arctic Archipelago; Carbon, organic, dissolved; Chloride; Comment; DATE/TIME; Geochemistry; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; inorganic carbon; Magnesium; major ions; Potassium; River; rivers; Sodium; Strontium; Sulfate; water isotopes; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 371 data points
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    DATA PANGAEA
  • 5
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    (S3) Geochemical data for the CAA-Rivers Project Time Series at the Freshwater Creek, NU, collected from 2014-2016 (2019)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Keywords: Barium; CAA_Freshwater_Creek; Calcium; Canadian Arctic Archipelago; Carbon, organic, dissolved; Chloride; Comment; DATE/TIME; Geochemistry; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; inorganic carbon; Magnesium; major ions; Potassium; River; rivers; Sodium; Strontium; Sulfate; water isotopes; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 280 data points
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    DATA PANGAEA
  • 6
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    (S1) Geochemical data for the CAA-Rivers Project, collected from 2014-2016 (2019)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Keywords: Alkalinity, total; Barium; CAA_Akpat_Kuunga; CAA_Burnside_River; CAA_Charles_York_River; CAA_Coppermine; CAA_Creswell_River; CAA_Cunningham_River; CAA_Devon_Island; CAA_Ehoktok_Lake; CAA_Ekalluk_River; CAA_Ekalulia_Lake_out; CAA_Ellice_River; CAA_Elu_Inlet; CAA_Ferguson_Lake; CAA_Freshwater_Creek; CAA_Garnier_River; CAA_Glacier_River; CAA_Greiner_LS_Greiner_Lake_in; CAA_Greiner_LS_Greiner_Lake_out; CAA_Greiner_LS_Long_Lake_at_Mount_Pelly; CAA_Greiner_LS_Second_Lake; CAA_Greiner_LS_Upper_Long_Lake; CAA_Halokvik_River; CAA_Jayko_River; CAA_Koignuk_River; CAA_Lake_in_Upper_Tree_River; CAA_Le_Feuvre_Inlet; CAA_Marcil_Creek; CAA_Mecham_River; CAA_Pasley_River; CAA_Rain_Cambridge_Bay_NU; CAA_Rain_Kugluktuk_NU; CAA_Saaqu_River; CAA_Simpson_River; CAA_Small_Lake_North_of_Ehoktok_Lake; CAA_Tingmeak_River; CAA_Tree_River; CAA_Wentzel_Lake; CAA_Western_River; Calcium; Canadian Arctic Archipelago; Carbon, inorganic, dissolved; Carbon, organic, dissolved; Chloride; Comment; DATE/TIME; Event label; Geochemistry; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; inorganic carbon; LATITUDE; LONGITUDE; Magnesium; major ions; Potassium; River; rivers; Salinity; Sodium; Station label; Strontium; Sulfate; water isotopes; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 634 data points
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    DATA PANGAEA
  • 7
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    Land2Sea database, Version 2.0 (2018)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Description: Expansion (version 2.0) of the original Land2Sea database of exorheic rivers (Peucker-Ehrenbrink, 2009, doi:10.1029/2008GC002356) that contains information on 1519 rivers, with additional literature estimates of basin size, water discharge (runoff) under current conditions and prior to human intervention, suspended sediment discharge under current conditions and prior to human intervention, estimate of sediment bedload flux, dissolved strontium concentration and radiogenic isotope value as well as particulate (silt or clay) neodymium concentration, isotope composition and Nd model ages. A large addition to the original river database that contains a significant amount of data from the compilation of Meybeck and Ragu (1996) is from Milliman and Farnsworth (2011). The compilation is not yet geo-referenced. The 2156 rivers are sorted alphabetically within each large-scale drainage region (Graham et al., 1999, 2000). In addition, the compilation includes data on sizes of, and sediment discharge from 48 small islands in Oceania with very high sediment yields. Any errors in transcribing data or converting units from their primary sources into this compilation are entirely mine. Acknowledgements: BPE acknowledges financial support from NSR-EAR-0087697, -0125873, -1226818 and ICER-1639557, as well as from WHOI's Investment in Research and Development Fund.
    Type: Dataset
    Format: application/zip, 90.8 kBytes
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    DATA PANGAEA
  • 8
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    Global river particulate black carbon amounts, 14C values, 14C ages and benzene polycarboxylic acid marker compounds (2018)
    PANGAEA
    In:  Supplement to: Coppola, Alysha I; Wiedemeier, Daniel B; Galy, Valier; Haghipour, Negar; Hanke, Ulrich M; Nascimento, Gabriela S; Usman, Muhammed Ojoshogu; Blattmann, Thomas Michael; Reisser, Moritz; Freymond, Chantal V; Zhao, Meixun; Voss, Britta; Wacker, Lukas; Schefuß, Enno; Peucker-Ehrenbrink, Bernhard; Abiven, Samuel; Schmidt, Michael W I; Eglinton, Timothy Ian (2018): Global-scale evidence for the refractory nature of riverine black carbon. Nature Geoscience, 11(8), 584-588, https://doi.org/10.1038/s41561-018-0159-8
    Details
    Publication Date: 2023-01-13
    Description: Wildfires and incomplete combustion of fossil fuel produce large amounts of black carbon. Black carbon production and transport are essential components of the carbon cycle. Constraining estimates of black carbon exported from land to ocean is critical, given ongoing changes in land use and climate, which affect fire occurrence and black carbon dynamics. Here, we present an inventory of the concentration and radiocarbon content (∆14C) of particulate black carbon for 18 rivers around the globe. We find that particulate black carbon accounts for about 15.8 ± 0.9% of river particulate organic carbon, and that fluxes of particulate black carbon co-vary with river-suspended sediment, indicating that particulate black carbon export is primarily controlled by erosion. River particulate black carbon is not exclusively from modern sources but is also aged in intermediate terrestrial carbon pools in several high-latitude rivers, with ages of up to 17,000 14C years. The flux-weighted 14C average age of particulate black carbon exported to oceans is 3,700 ± 400 14C years. We estimate that the annual global flux of particulate black carbon to the ocean is 0.017 to 0.037 Pg, accounting for 4 to 32% of the annually produced black carbon. When buried in marine sediments, particulate black carbon is sequestered to form a long-term sink for CO2.
    Type: Dataset
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 29.3 kBytes
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    DATA PANGAEA
  • 9
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    (Table S8) Re-Os analyses of sediment leaches and associated age corrections for the Bottaccione Section, Gubbio
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: AGE; Correction; GUB; Gubbio; HEIGHT above ground; Inductively coupled plasma - mass spectrometry (ICP-MS); Italy; Osmium; Osmium-187/Osmium-188, error; Osmium-187/Osmium-188 ratio; Rhenium; Rhenium-187/Osmium-188 ratio
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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    DATA PANGAEA
  • 10
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    (Table S6) Os isotope and platinum group element content in the Bottaccione Section, Gubbio
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: AGE; GUB; Gubbio; HEIGHT above ground; Inductively coupled plasma - mass spectrometry (ICP-MS); Iridium; Italy; Osmium; Osmium/Iridium ratio; Osmium-187/Osmium-188, error; Osmium-187/Osmium-188 ratio; Platinum; Platinum/Iridium ratio
    Type: Dataset
    Format: text/tab-separated-values, 490 data points
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    DATA PANGAEA
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