Iron oxide mineralogy and stable iron isotope composition in a Gleysol with petrogleyic properties

2011 ◽  
Vol 12 (1) ◽  
pp. 97-114 ◽  
Author(s):  
Tim Mansfeldt ◽  
Stephan Schuth ◽  
Werner Häusler ◽  
Friedrich E. Wagner ◽  
Stephan Kaufhold ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Isotope Composition ◽  
Iron Isotope

The geologic history of seawater oxygen isotopes from marine iron oxides

Science ◽  
2019 ◽  
Vol 365 (6452) ◽  
pp. 469-473 ◽  
Author(s):  
Nir Galili ◽  
Aldo Shemesh ◽  
Ruth Yam ◽  
Irena Brailovsky ◽  
Michal Sela-Adler ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Oxygen Isotope ◽  
Iron Oxides ◽  
Isotope Composition ◽  
Geologic History ◽  
Temperature Dependent ◽  
Oxygen Isotope Fractionation ◽  
History Of ◽  
Sediment Cover

The oxygen isotope composition (δ18O) of marine sedimentary rocks has increased by 10 to 15 per mil since Archean time. Interpretation of this trend is hindered by the dual control of temperature and fluid δ18O on the rocks’ isotopic composition. A new δ18O record in marine iron oxides covering the past ~2000 million years shows a similar secular rise. Iron oxide precipitation experiments reveal a weakly temperature-dependent iron oxide–water oxygen isotope fractionation, suggesting that increasing seawater δ18O over time was the primary cause of the long-term rise in δ18O values of marine precipitates. The18O enrichment may have been driven by an increase in terrestrial sediment cover, a change in the proportion of high- and low-temperature crustal alteration, or a combination of these and other factors.

scholarly journals Iron isotope evidence for very rapid accretion and differentiation of the proto-Earth

2020 ◽  
Vol 6 (7) ◽  
pp. eaay7604 ◽  
Author(s):  
Martin Schiller ◽  
Martin Bizzarro ◽  
Julien Siebert
Keyword(s):  
Solar System ◽  
Isotope Composition ◽  
Terrestrial Planets ◽  
Carbonaceous Chondrites ◽  
Iron Isotope ◽  
System Composition ◽  
Solar System Objects ◽  
History Of ◽  
Isotope Evidence ◽  
Enstatite Chondrites

Nucleosynthetic isotope variability among solar system objects provides insights into the accretion history of terrestrial planets. We report on the nucleosynthetic Fe isotope composition (μ54Fe) of various meteorites and show that the only material matching the terrestrial composition is CI (Ivuna-type) carbonaceous chondrites, which represent the bulk solar system composition. All other meteorites, including carbonaceous, ordinary, and enstatite chondrites, record excesses in μ54Fe. This observation is inconsistent with protracted growth of Earth by stochastic collisional accretion, which predicts a μ54Fe value reflecting a mixture of the various meteorite parent bodies. Instead, our results suggest a rapid accretion and differentiation of Earth during the ~5–million year disk lifetime, when the volatile-rich CI-like material is accreted to the proto-Sun via the inner disk.

scholarly journals On the iron isotope composition of Mars and volatile depletion in the terrestrial planets

2016 ◽  
Vol 449 ◽  
pp. 360-371 ◽  
Author(s):  
Paolo A. Sossi ◽  
Oliver Nebel ◽  
Mahesh Anand ◽  
Franck Poitrasson
Keyword(s):  
Isotope Composition ◽  
Terrestrial Planets ◽  
Iron Isotope

Nebular and asteroidal modification of the iron isotope composition of chondritic components

2005 ◽  
Vol 239 (3-4) ◽  
pp. 203-218 ◽  
Author(s):  
E. Mullane ◽  
S.S. Russell ◽  
M. Gounelle
Keyword(s):  
Isotope Composition ◽  
Iron Isotope

Iron isotope composition of some Archean and Proterozoic iron formations

2012 ◽  
Vol 80 ◽  
pp. 158-169 ◽  
Author(s):  
Noah Planavsky ◽  
Olivier J. Rouxel ◽  
Andrey Bekker ◽  
Axel Hofmann ◽  
Crispin T.S. Little ◽  
...  
Keyword(s):  
Isotope Composition ◽  
Iron Isotope ◽  
Iron Formations

In-situ iron isotope analyses reveal igneous and magmatic-hydrothermal growth of magnetite at the Los Colorados Kiruna-type iron oxide-apatite deposit, Chile

2019 ◽  
Vol 104 (4) ◽  
pp. 471-484 ◽  
Author(s):  
Jaayke L. Knipping ◽  
Adrian Fiege ◽  
Adam C. Simon ◽  
Martin Oeser ◽  
Martin Reich ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Hydrothermal Growth ◽  
Iron Isotope ◽  
Isotope Analyses

Iron isotope fractionation during microbial dissimilatory iron oxide reduction in simulated Archaean seawater

Geobiology ◽  
2011 ◽  
Vol 9 (3) ◽  
pp. 205-220 ◽  
Author(s):  
E. M. PERCAK-DENNETT ◽  
B. L. BEARD ◽  
H. XU ◽  
H. KONISHI ◽  
C. M. JOHNSON ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Isotope Fractionation ◽  
Oxide Reduction ◽  
Iron Isotope ◽  
Iron Oxide Reduction

Iron Isotope Composition of Particles Produced by UV-Femtosecond Laser Ablation of Natural Oxides, Sulfides, and Carbonates

2013 ◽  
Vol 85 (24) ◽  
pp. 11885-11892 ◽  
Author(s):  
Francois-Xavier d’Abzac ◽  
Brian L. Beard ◽  
Andrew D. Czaja ◽  
Hiromi Konishi ◽  
James J. Schauer ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Isotope Composition ◽  
Femtosecond Laser Ablation ◽  
Iron Isotope
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