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Pregled bibliografske jedinice broj: 922209

Uranium isotope geochemistry in modern coastal sediments: insights from Toulon Bay, France


Huy Dang, Duc; Evans, R. Douglas; Wang, Wei; Omanović, Dario; El Houssainy, Amonda; Lenoble, Véronique; Mullot, Jean-Ulrich; Mounier, Stéphane; Garnier, Cédric
Uranium isotope geochemistry in modern coastal sediments: insights from Toulon Bay, France // Chemical geology, 481 (2018), 133-145 doi:10.1016/j.chemgeo.2018.01.032 (međunarodna recenzija, članak, znanstveni)


Naslov
Uranium isotope geochemistry in modern coastal sediments: insights from Toulon Bay, France

Autori
Huy Dang, Duc ; Evans, R. Douglas ; Wang, Wei ; Omanović, Dario ; El Houssainy, Amonda ; Lenoble, Véronique ; Mullot, Jean-Ulrich ; Mounier, Stéphane ; Garnier, Cédric

Izvornik
Chemical geology (0009-2541) 481 (2018); 133-145

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Uranium ; Coastal sediments ; Diagenesis ; Uranium isotope composition ; Multiple regression

Sažetak
By assessing U geochemistry as well as U isotopic composition in marine sediments of Toulon Bay, NW Mediterranean Sea, authigenic U accumulation was found to be tightly linked to that of Mo and V with slight differences in accumulation rate depending on sediment redox conditions. In sediments collected on a transect along a river plume, the authigenic accumulation of these redox-sensitive elements appears to be linked to sediment grain size which probably drives the redox status of the sediments. A typical U loss in re-oxidized sediments was observed in sediments that had been previously disturbed. However, the dissolved U profiles do not show a simple and typical depletion trend but rather a depletion in the top 10 cm followed by release in deeper pore waters that could be linked to a potential reoxidation/mobilization of authigenic U(IV). The released U could be further scavenged as a U-P precipitate. The U isotopic data (δ238U), which are the first reported for the coastal hypoxic sediments of Toulon Bay, average −0.12 ± 0.12‰ in surface sediments. However, sediments situated in front of river mouths show higher values of δ238U (up to +0.75‰) ; these high values are reported for the first time in sediments below an oxic water column

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija



POVEZANOST RADA


Ustanove
Institut "Ruđer Bošković", Zagreb

Autor s matičnim brojem:
Dario Omanović, (214643)

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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