scholarly journals Zinc isotopic composition of iron meteorites: Absence of isotopic anomalies and origin of the volatile element depletion

2013 ◽  
Vol 48 (12) ◽  
pp. 2441-2450 ◽  
Author(s):  
Heng Chen ◽  
Bach Mai Nguyen ◽  
Frédéric Moynier
Keyword(s):  
Isotopic Composition ◽  
Iron Meteorites ◽  
Volatile Element ◽  
Isotopic Anomalies

scholarly journals The Cu isotopic composition of iron meteorites

2012 ◽  
Vol 47 (2) ◽  
pp. 268-276 ◽  
Author(s):  
Matthew Cole BISHOP ◽  
Frederic MOYNIER ◽  
Charlotte WEINSTEIN ◽  
Jean-Gabriel FRABOULET ◽  
Kun WANG ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Iron Meteorites

The abundance and isotopic composition of Cd in iron meteorites

2013 ◽  
Vol 48 (12) ◽  
pp. 2597-2607 ◽  
Author(s):  
Thomas S. Kruijer ◽  
Peter Sprung ◽  
Thorsten Kleine ◽  
Ingo Leya ◽  
Rainer Wieler
Keyword(s):  
Isotopic Composition ◽  
Iron Meteorites

Isotopic Composition of Atmospheric Oxygen During the Geological Past

1974 ◽  
Vol 29 (6) ◽  
pp. 964-965 ◽  
Author(s):  
K. Heinzinger ◽  
M. Schidlowski ◽  
C. Junge
Keyword(s):  
Isotopic Composition ◽  
Atmospheric Oxygen ◽  
Iron Meteorites ◽  
Free Oxygen ◽  
Geological Past ◽  
Time Periods

Ablation products of iron meteorites recovered from Tertiary and Devonian sediments have preserved the 18O/16O ratio of atmospheric oxygen from the respective time periods. While the Tertiary atmosphere was characterized by a rather modern δ18O value (~23.3% o vs. SMOW), the δ-value of the Devonian free oxygen reservoir was markedly lower (~17.3‰) which can be explained in terms of a reduced 18O release by contemporary land photosynthesis.

The partitioning of the inner and outer solar system by a structured protoplanetary disk

2020 ◽  
Author(s):  
Ramon Brasser ◽  
Stephen Mojzsis
Keyword(s):  
Solar System ◽  
Protoplanetary Disk ◽  
Giant Planets ◽  
Iron Meteorites ◽  
Effective Barrier ◽  
Dynamical Simulations ◽  
Pressure Maximum ◽  
Ringed Structure ◽  
Isotopic Anomalies ◽  
Multiple Rings

<p>Mass-independent isotopic anomalies in planets and meteorites define two cosmochemically distinct regions: the carbonaceous and non-carbonaceous meteorites, implying that the non-carbonaceous (terrestrial) and carbonaceous (jovian) reservoirs were kept separate during and after planet formation. The iron meteorites show a similar dichotomy.</p><p>The formation of Jupiter is widely invoked to explain this compositional dichotomy by acting as an effective barrier between the two reservoirs. Jupiter’s solid kernel possibly grew to ~20 Mearth in ~1 Myr from the accretion of sub meter-sized objects (termed “pebbles”), followed by slower accretion via planetesimals. Subsequent gas envelope contraction is thought to have led to Jupiter’s formation as a gas giant.</p><p>We show using dynamical simulations that the growth of Jupiter from pebble accretion is not fast enough to be responsible for the inferred separation of the terrestrial and jovian reservoirs. We propose instead that the dichotomy was caused by a pressure maximum in the disk near Jupiter’s location, which created a ringed structure such as those detected by the Atacama Large Millimeter/submillimeter Array(ALMA). One or multiple such long-lived pressure maxima almost completely prevented pebbles from the jovian region reaching the terrestrial zone, maintaining a compositional partition between the two regions. We thus suggest that our young solar system’s protoplanetary disk developed at least one and likely multiple rings, which potentially triggered the formation of the giant planets [1].</p><p><br>[1] Brasser, R. and Mojzsis, S.J. (2020) Nature Astronomy doi: 10.1038/s41550-019-0978-6</p>

Isotopic anomalies of molybdenum in iron meteorites

2006 ◽  
Vol 70 (18) ◽  
pp. A668
Author(s):  
M.D. Varner ◽  
M.E. Wieser ◽  
J.R. De Laeter
Keyword(s):  
Iron Meteorites ◽  
Isotopic Anomalies

A search for nickel isotopic anomalies in iron meteorites and chondrites

2009 ◽  
Vol 73 (5) ◽  
pp. 1461-1471 ◽  
Author(s):  
J.H. Chen ◽  
D.A. Papanastassiou ◽  
G.J. Wasserburg
Keyword(s):  
Iron Meteorites ◽  
Isotopic Anomalies
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