ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Silicon cycle  (2)
  • 111-504B; 140-504B; 148-504B; 52-417D; 69-504B; 70-504B; 83-504B; Caesium; Deep Sea Drilling Project; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Isotope dilution; Joides Resolution; Leg111; Leg140; Leg148; Leg52; Leg69; Leg70; Leg83; Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS); North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Thallium; ε-Thallium-205  (1)
Collection
Keywords
Publisher
Years
  • 1
    facet.materialart.
    Unknown
    Thallium concentrations and isotope composition of MORB glasses and altered oceani crust from DSDP/ODP Hole 504B and DSDP Hole 52-417D (2006)
    PANGAEA
    In:  Supplement to: Nielsen, Sune G; Rehkämper, Mark; Teagle, Damon A H; Butterfield, David A; Alt, Jeffrey C; Halliday, Alex N (2006): Hydrothermal fluid fluxes calculated from the isotopic mass balance of thallium in the ocean crust. Earth and Planetary Science Letters, 251(1-2), 120-133, https://doi.org/10.1016/j.epsl.2006.09.002
    Details
    Publication Date: 2024-01-09
    Description: Hydrothermal fluids expelled from the seafloor at high and low temperatures play pivotal roles in controlling seawater chemistry. However, the magnitude of the high temperature water flux of mid-ocean ridge axes remains widely disputed and the volume of low temperature vent fluids at ridge flanks is virtually unconstrained. Here, we determine both high and low temperature hydrothermal fluid fluxes using the chemical and isotopic mass balance of the element thallium (Tl) in the ocean crust. Thallium is a unique tracer of ocean floor hydrothermal exchange because of its contrasting behavior during seafloor alteration at low and high temperatures and the distinctive isotopic signatures of fresh and altered MORB and seawater. The calculated high temperature hydrothermal water flux is (0.17-2.93)*10**13 kg/yr with a best estimate of 0.72*10**13 kg/yr. This result suggests that only about 5 to 80% of the heat available at mid-ocean ridge axes from the crystallization and cooling of the freshly formed ocean crust, is released by high temperature black smoker fluids.The residual thermal energy ismost likely lost via conduction and/or through the circulation of intermediate temperature hydrothermal fluids that do not alter the chemical budgets of Tl in the ocean crust. The Tl-based calculations indicate that the low temperature hydrothermal water flux at ridge flanks is (0.2-5.4)*10**17 kg/yr. This implies that the fluids have an average temperature anomaly of only about 0.1 to 3.6 °C relative to ambient seawater. If these low temperatures are correct then both Sr and Mg are expected to be relatively unreactive in ridge-flank hydrothermal systems and this may explain why the extent of basalt alteration that is observed for altered ocean crust appears insufficient to balance the oceanic budgets of 87Sr/86Sr and Mg.
    Keywords: 111-504B; 140-504B; 148-504B; 52-417D; 69-504B; 70-504B; 83-504B; Caesium; Deep Sea Drilling Project; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Isotope dilution; Joides Resolution; Leg111; Leg140; Leg148; Leg52; Leg69; Leg70; Leg83; Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS); North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Thallium; ε-Thallium-205
    Type: Dataset
    Format: text/tab-separated-values, 75 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Erratum to “Deep ocean nutrients during the Last Glacial Maximum deduced from sponge silicon isotopic compositions” [Earth Planet. Sci. Lett. 292 (2010) 290–300] (2011)
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Earth and Planetary Science Letters 302 (2011): 253-254, doi:10.1016/j.epsl.2010.12.023.
    Description: The relative importance of biological and physical processes within the Southern Ocean for the storage of carbon and atmospheric pCO2 on glacial-interglacial timescales remains uncertain. Understanding the impact of surface biological production on carbon export in the past relies on the reconstruction of the nutrient supply from upwelling deep-waters. In particular, the upwelling of silicic acid (Si(OH)4) is tightly coupled to carbon export in the Southern Ocean via diatom productivity. Here, we address how changes in deep-water Si(OH)4 concentrations can be reconstructed using the silicon isotopic composition of deep-sea sponges. We report δ30Si of modern deep-sea sponge spicules and show that they reflect seawater Si(OH)4 concentration. The fractionation factor of sponge δ30Si compared to seawater δ30Si shows a positive relationship with Si(OH)4, which may be a growth rate effect. Application of this proxy in two down-core records from the Scotia Sea reveals that Si(OH)4 concentrations in the deep Southern Ocean during the Last Glacial Maximum (LGM) were no different than today. Our result does not support a coupling of carbon and nutrient build up in an isolated deep-ocean reservoir during the LGM. Our data, combined with records of stable isotopes from diatoms, are only consistent with enhanced LGM Southern Ocean nutrient utilization if there was also a concurrent reduction in diatom silicification or a shift from siliceous to organic-walled phytoplankton.
    Description: Cruise NBP0805 was funded by NSF Office of Polar Programs (OPP) Antarctic Sciences (grant number ANT-0636787). Data from the Palmer LTER data archive were supported by Office of Polar Programs, NSF grants OPP-9011927, OPP-9632763 and OPP-0217282. The work was funded by the Natural Environment Research Council (NERC) grant NE/F005296/1 and an Antarctic Science Bursary.
    Keywords: Porifera ; Spicule ; Silicic acid ; Deep-water ; Silicon cycle ; Glacial
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 3
    facet.materialart.
    Unknown
    Deep ocean nutrients during the Last Glacial Maximum deduced from sponge silicon isotopic compositions (2010)
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Earth and Planetary Science Letters 292 (2010): 290-300, doi:10.1016/j.epsl.2010.02.005.
    Description: The relative importance of biological and physical processes within the Southern Ocean for the storage of carbon and atmospheric pCO2 on glacial-interglacial timescales remains uncertain. Understanding the impact of surface biological production on carbon export in the past relies on the reconstruction of the nutrient supply from upwelling deep-waters. In particular, the upwelling of silicic acid (Si(OH)4) is tightly coupled to carbon export in the Southern Ocean via diatom productivity. Here, we address how changes in deep-water Si(OH)4 concentrations can be reconstructed using the silicon isotopic composition of deep-sea sponges. We report δ30Si of modern deep-sea sponge spicules and show that they reflect seawater Si(OH)4 concentration. The fractionation factor of sponge δ30Si compared to seawater δ30Si shows a positive relationship with Si(OH)4, which may be a growth rate effect. Application of this proxy in two down-core records from the Scotia Sea reveals that Si(OH)4 concentrations in the deep Southern Ocean during the Last Glacial Maximum (LGM) were no different than today. Our result does not support a coupling of carbon and nutrient build up in an isolated deep-ocean reservoir during the LGM. Our data, combined with records of stable isotopes from diatoms, are only consistent with enhanced LGM Southern Ocean nutrient utilization if there was also a concur rent reduction in diatom silicification or a shift from siliceous to organic walled phytoplankton.
    Description: Cruise NBP0805 was funded by NSF Office of Polar Programs (OPP) Antarctic Sciences (grant number ANT-0636787). Data from the Palmer LTER data archive were supported by Office of Polar Programs, NSF grants OPP-9011927, OPP-9632763 and OPP-0217282. The work was funded by the Natural Environment Research Council (NERC) grant NE/F005296/1 and an Antarctic Science Bursary.
    Keywords: Porifera ; Spicule ; Silicic acid ; Deep-water ; Silicon cycle ; Glacial
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...