Results 71 to 80 of about 43,521 (279)

60Fe-60Ni chronology of core formation in Mars

, 2014
The timescales of accretion, core formation, and magmatic differentiation in planetary bodies can be constrained using extinct radionuclide systems. Experiments have shown that Ni becomes more siderophile with decreasing pressure, which is reflected in ...
Dauphas, Nicolas, Tang, Haolan
core   +1 more source

Mountain‐top spherules: Criteria to identify natural and synthetic particles

Meteoritics &Planetary Science, EarlyView.
Abstract Natural microspherules are important tracers of geologic and environmental processes in modern and ancient deposits. However, anthropogenic contamination can dilute natural collections by releasing synthetic microspherules into the environment.
M. R. Boyd, M. J. Genge
wiley   +1 more source

Type 1 aqueous alteration in CM carbonaceous chondrites: Implications for the evolution of water‐rich asteroids

, 2017
The CM carbonaceous chondrite meteorites experienced aqueous alteration in the early solar system. They range from mildly altered type 2 to almost completely hydrated type 1 chondrites, and offer a record of geochemical conditions on water‐rich asteroids.
A. J. King, P. Schofield, S. S. Russell
semanticscholar   +1 more source

The effect of terrestrial weathering on the mineralogy and petrologic (sub)types of CM chondrites explored by kinetic modeling and laboratory experiments

Meteoritics &Planetary Science, EarlyView.
Abstract Terrestrial weathering alters the chemical and isotopic composition, and mineralogy, of meteorites; its effects on ordinary chondrites are well‐studied, but relatively little is known about the susceptibility of carbonaceous chondrites. We combined laboratory experiments, whereby Chwichiya 002 (C3‐ung find), Murchison (CM2 fall) and Kolang ...
Robin L. Haller, Martin R. Lee, Mark E. Hodson   +2 more
wiley   +1 more source

Meteorites and the RNA World: Synthesis of Nucleobases in Carbonaceous Planetesimals and the Role of Initial Volatile Content

The Astrophysical Journal, 2023
Prebiotic molecules, fundamental building blocks for the origin of life, have been found in carbonaceous chondrites. The exogenous delivery of these organic molecules onto the Hadean Earth could have sparked the polymerization of the first RNA molecules ...
Klaus Paschek, Dmitry A. Semenov, Ben K. D. Pearce, Kevin Lange, Thomas K. Henning, Ralph E. Pudritz   +5 more
doaj   +1 more source

Oxygen isotopes in CO3 chondrites [PDF]

, 2002
Oxygen isotope analyses were undertaken on seven CO3 chondrites. No correlation was seen between metamorphic grade in CO3s and oxygen isotopic compositions.
Franchi, I.A., Greenwood, R.C., Pillinger, C.T.   +2 more
core  

Aqueous alteration in C2‐ung Bells through the analysis of carbonates – Does a CR origin ring true?

Meteoritics &Planetary Science, EarlyView.
Abstract Bells is an ungrouped carbonaceous chondrite that has in recent years been proposed as a CR‐an. This link to CR chondrites has previously been identified through the analysis of anhydrous silicates, for example, oxygen isotopic compositions of olivine (Marrocchi et al., 2023).
L. J. Riches, M. D. Suttle, I. A. Franchi, X. Zhao, M. M. Grady   +4 more
wiley   +1 more source

TAXONOMIC REVIEW OF CHONDRITES AFFINIS (STERNBERG, 1833) FROM CRETACEOUS-NEOGENE OFFSHORE-DEEP-SEA TETHYAN SEDIMENTS AND RECOMMENDATION FOR ITS FURTHER USE

Rivista Italiana di Paleontologia e Stratigrafia, 2012
The branched trace fossil Chondrites affinis (Sternberg, 1833), synonymised so far with C. targionii (Brongniart, 1828), has been analyzed in an exceptionally well preserved specimen from the Saraceno Formation (?Upper Cretaceous; ?Eocene-Miocene) in the
ALFRED UCHMAN, CLAUDIA CARUSO, MAURIZIO SONNINO   +2 more
doaj   +1 more source

Shock stage distribution of 2280 ordinary chondrites—Can bulk chondrites with a shock stage of S6 exist as individual rocks?

Meteoritics and Planetary Science, 2018
The brecciation and shock classification of 2280 ordinary chondrites of the meteorite thin section collection at the Institut für Planetologie (Münster) has been determined.
A. Bischoff, M. Schleiting, M. Patzek
semanticscholar   +1 more source

The Meteoritical Bulletin, No. 114

Meteoritics &Planetary Science, EarlyView.
Abstract Meteoritical Bulletin 114 contains the 1944 meteorites approved by the Nomenclature Committee of the Meteoritical Society in 2025. It includes 15 observed falls, 1336 ordinary chondrites, 213 HED, 106 carbonaceous chondrites (including 8 ungrouped), 86 lunar meteorites, 39 ureilites, 28 iron meteorites (2 ungrouped), 24 martian meteorites, 24 ...
Jérôme Gattacceca, Jeffrey N. Grossman, Michael M. Weisberg, Ansgar Greshake, Natasha V. Almeida, Camille Cartier, Jon M. Friedrich, Cyrena Goodrich, Katherine H. Joy, Maria Schönbächler, Devin L. Schrader, Hikaru Yabuta, Bidong Zhang   +12 more
wiley   +1 more source