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  • IUGG Secretariat, CIRES Cooperative Institute for Research in Environmental Sciences, University of Colorado  (6)
  • Deutsches GeoForschungsZentrum GFZ  (5)
  • 2000-2004  (11)
  • 1
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    IUGG Electronic Journal Vol. 4 (2004)
    IUGG Secretariat, CIRES Cooperative Institute for Research in Environmental Sciences, University of Colorado
    Details
    Publication Date: 2020-02-12
    Language: English
    Type: info:eu-repo/semantics/other
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  • 2
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    IUGG Electronic Journal Vol. 2 (2002)
    IUGG Secretariat, CIRES Cooperative Institute for Research in Environmental Sciences, University of Colorado
    Details
    Publication Date: 2020-02-12
    Language: English
    Type: info:eu-repo/semantics/other
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  • 3
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    IUGG Electronic Journal Vol. 1 (2001)
    IUGG Secretariat, CIRES Cooperative Institute for Research in Environmental Sciences, University of Colorado
    Details
    Publication Date: 2020-02-12
    Language: English
    Type: info:eu-repo/semantics/other
    Format: application/pdf
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  • 4
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    IUGG Electronic Journal Vol. 3 (2003)
    IUGG Secretariat, CIRES Cooperative Institute for Research in Environmental Sciences, University of Colorado
    Details
    Publication Date: 2020-02-12
    Language: English
    Type: info:eu-repo/semantics/other
    Format: application/pdf
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  • 5
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    IUGG Annual Report 2002 (2003)
    IUGG Secretariat, CIRES Cooperative Institute for Research in Environmental Sciences, University of Colorado
    In:  IUGG Annual Report
    Details
    Publication Date: 2023-03-02
    Language: English
    Type: info:eu-repo/semantics/report
    Format: application/pdf
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  • 6
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    IUGG Annual Report 2003 (2004)
    IUGG Secretariat, CIRES Cooperative Institute for Research in Environmental Sciences, University of Colorado
    In:  IUGG Annual Report
    Details
    Publication Date: 2023-03-02
    Language: English
    Type: info:eu-repo/semantics/report
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  • 7
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    Boron as a tracer for material transfer in subduction zones (2004)
    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Details
    Publication Date: 2020-02-12
    Description: Late Miocene to Quaternary volcanic rocks from the frontal arc to the back-arc region of the Central Volcanic Zone in the Andes show a wide range of delta 11B values (+4 to -7 ‰) and boron concentrations (6 to 60 ppm). Positive delta 11B values of samples from the volcanic front indicate involvement of a 11B-enriched slab component, most likely derived from altered oceanic crust, despite the thick Andean continental lithosphere, and rule out a pure crust-mantle origin for these lavas. The delta 11B values and B concentrations in the lavas decrease systematically with increasing depth of the Wadati-Benioff Zone. This across-arc variation in delta 11B values and decreasing B/Nb ratios from the arc to the back-arc samples are attributed to the combined effects of B-isotope fractionation during progressive dehydration in the slab and a steady decrease in slab-fluid flux towards the back arc, coupled with a relatively constant degree of crustal contamination as indicated by similar Sr, Nd and Pb isotope ratios in all samples. Modelling of fluid-mineral B-isotope fractionation as a function of temperature fits the across-arc variation in delta 11B and we conclude that the B-isotope composition of arc volcanics is dominated by changing delta 11B composition of B-rich slab-fluids during progressive dehydration. Crustal contamination becomes more important towards the back-arc due to the decrease in slab-derived fluid flux. Because of this isotope fractionation effect, high delta 11B signatures in volcanic arcs need not necessarily reflect differences in the initial composition of the subducting slab. Three-component mixing calculations for slab-derived fluid, the mantle wedge and the continental crust based on B, Sr and Nd isotope data indicate that the slab-fluid component dominates the B composition of the fertile mantle and that the primary arc magmas were contaminated by an average addition of 15 to 30 % crustal material.
    Language: English
    Type: info:eu-repo/semantics/doctoralThesis
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  • 8
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    GPS Atmosphären-Sondierungs-Projekt (GASP) : ein innovativer Ansatz zur Bestimmung von Atmosphärenparametern ; Abschlussbericht ; HGF-Strategiefonds-Projekt GASP - FKZ 01SF9922 des AWI, DLR, GFZ und GKSS (2004)
    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Details
    Publication Date: 2021-08-07
    Language: German
    Type: info:eu-repo/semantics/report
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  • 9
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    Diatomeen als Indikatoren für Umwelt- und Klimaänderungen : Eine mittel- bis spätholozäne Studie am Holzmaar, Westeifel (2003)
    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Details
    Publication Date: 2021-08-08
    Language: German
    Type: info:eu-repo/semantics/doctoralThesis
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  • 10
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    Das CHAMP-Radiookkultationsexperiment: Algorithmen, Prozessierungssystem und erste Ergebnisse (2002)
    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Details
    Publication Date: 2021-08-20
    Language: German
    Type: info:eu-repo/semantics/doctoralThesis
    Format: application/pdf
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