Uranium isotopes distinguish two geochemically distinct stages during the later Cambrian SPICE event.
Tais W. Dahl,Richard Boyle,Donald E. Canfield,James N. Connelly,Benjamin C. Gill,Timothy M. Lenton,Martin Bizzarro +6 more
Reads0
Chats0
TLDR
High-precision uranium isotopic data in marine carbonates deposited during the Late Cambrian 'SPICE' event is reported, documenting a well-defined -0.18‰ negative δ238U excursion that occurs at the onset of the SPICE event's positive δ13C and δ34S excursions, but peaks (and tails off) before them.About:
This article is published in Earth and Planetary Science Letters.The article was published on 2014-09-01 and is currently open access. It has received 134 citations till now. The article focuses on the topics: Isotopes of uranium.read more
Citations
More filters
Journal ArticleDOI
Ocean Biogeochemical Dynamics
TL;DR: Sensitivity of global ocean biogeochemical dynamics to ecosystem structure in a future climate and model methods for Marine Science are described.
Journal ArticleDOI
Uranium and molybdenum isotope evidence for an episode of widespread ocean oxygenation during the late Ediacaran Period
Brian Kendall,Brian Kendall,Tsuyoshi Komiya,Tsuyoshi Komiya,Tsuyoshi Komiya,Timothy W. Lyons,Steve Bates,Gwyneth W. Gordon,Stephen J. Romaniello,Ganqing Jiang,Robert A. Creaser,Shuhai Xiao,Kathleen A. McFadden,Yusuke Sawaki,Miyuki Tahata,Degan Shu,Jian Han,Yong Li,Xuelei Chu,Ariel D. Anbar +19 more
TL;DR: This paper measured the U and Mo isotope compositions of euxinic (anoxic and sulfidic) organic-rich mudrocks (ORM) of Member IV, upper Doushantuo Formation, South China.
Journal ArticleDOI
Uranium isotopic compositions of the crust and ocean: Age corrections, U budget and global extent of modern anoxia
TL;DR: In this paper, the double spike technique and a new data reduction method were used to analyze an array of seawater samples and 41 geostandards covering a broad range of geological settings relevant to low and high temperature geochemistry.
Journal ArticleDOI
Uranium Isotope Fractionation
TL;DR: A thorough review on the application of the U-decay series systems within Earth sciences was published in Reviews in Mineralogy and Geochemistry (RiMG) volume 52 in 2003, and will not be discussed further within this review as mentioned in this paper.
Journal ArticleDOI
Uranium and molybdenum isotope systematics in modern euxinic basins: Case studies from the central Baltic Sea and the Kyllaren fjord (Norway)
J. Noordmann,J. Noordmann,Stefan Weyer,Carolina Montoya-Pino,Olaf Dellwig,Nadja Neubert,Sebastian Eckert,M. Paetzel,Michael E. Böttcher +8 more
TL;DR: In this paper, the conditions controlling U isotope fractionation in selected modern anoxic basins (Baltic Sea: Landsort and Gotland Deeps and the Kyllaren fjord in Norway) and compares U with Mo isotope fractions were explored.
References
More filters
Journal ArticleDOI
Sedimentary organic matter preservation: an assessment and speculative synthesis
John I. Hedges,Richard G. Keil +1 more
TL;DR: For example, in a recent paper as discussed by the authors, the authors investigated the mechanisms governing sedimentary organic matter preservation in marine sediments and found that organic preservation in the marine environment is < 0.5% efficient, and that the factors which directly determine preservation vary with depositional regime, but have in common a critical interaction between organic and inorganic materials over locally variable time scales.
Journal ArticleDOI
Uranium solution-mineral equilibria at low temperatures with applications to sedimentary ore deposits
TL;DR: The Gibbs free energies, enthalpies and entropies of 42 dissolved uranium species and 30 uranium-bearing solid phases have been critically evaluated from the literature and estimated when necessary for 25°C.
Journal ArticleDOI
The oxygenation of the atmosphere and oceans
TL;DR: The last 3.85 Gyr of Earth history have been divided into five stages, and atmospheric oxygen levels probably rose to a maximum value of ca 0.3 atm during the Carboniferous before returning to its present value.
Journal ArticleDOI
Geochemistry of oceanic anoxic events
TL;DR: In the case of the Cenomanian-Turonian and early Aptian OAEs, a longer-term trend to less radiogenic values was observed as discussed by the authors.