Results 1 to 10 of about 33,638 (237)

Origin of Isotopic Diversity among Carbonaceous Chondrites [PDF]

The Astrophysical Journal Letters, 2023
Carbonaceous chondrites are some of the most primitive meteorites and derive from planetesimals that formed a few million years after the beginning of the solar system.
Jan L. Hellmann, Jonas M. Schneider, Elias Wölfer, Joanna Drążkowska, Christian A. Jansen, Timo Hopp, Christoph Burkhardt, Thorsten Kleine   +7 more
doaj   +2 more sources

The Ni isotopic composition of Ryugu reveals a common accretion region for carbonaceous chondrites. [PDF]

Sci Adv
The isotopic compositions of samples returned from Cb-type asteroid Ryugu and Ivuna-type (CI) chondrites are distinct from other carbonaceous chondrites, which has led to the suggestion that Ryugu/CI chondrites formed in a different region of the ...
Spitzer F, Kleine T, Burkhardt C, Hopp T, Yokoyama T, Abe Y, Aléon J, O'D Alexander CM, Amari S, Amelin Y, Bajo KI, Bizzarro M, Bouvier A, Carlson RW, Chaussidon M, Choi BG, Dauphas N, Davis AM, Di Rocco T, Fujiya W, Fukai R, Gautam I, Haba MK, Hibiya Y, Hidaka H, Homma H, Hoppe P, Huss GR, Ichida K, Iizuka T, Ireland TR, Ishikawa A, Itoh S, Kawasaki N, Kita NT, Kitajima K, Komatani S, Krot AN, Liu MC, Masuda Y, Morita M, Moynier F, Motomura K, Nakai I, Nagashima K, Nguyen A, Nittler L, Onose M, Pack A, Park C, Piani L, Qin L, Russell SS, Sakamoto N, Schönbächler M, Tafla L, Tang H, Terada K, Terada Y, Usui T, Wada S, Wadhwa M, Walker RJ, Yamashita K, Yin QZ, Yoneda S, Young ED, Yui H, Zhang AC, Nakamura T, Naraoka H, Noguchi T, Okazaki R, Sakamoto K, Yabuta H, Abe M, Miyazaki A, Nakato A, Nishimura M, Okada T, Yada T, Yogata K, Nakazawa S, Saiki T, Tanaka S, Terui F, Tsuda Y, Watanabe SI, Yoshikawa M, Tachibana S, Yurimoto H.   +90 more
europepmc   +3 more sources

Impact-induced sublimation drives volatile depletion in carbonaceous meteorites [PDF]

Nature Communications
Carbonaceous chondrites are amongst the most chemically primitive solid materials in the Solar System, yet many are depleted in moderately volatile elements.
Zheng-Yu Long, Frederic Moynier, Tim F. J. Bögels, Linru Fang, Razvan Caracas, Marine Paquet, Fred Jourdan, Tu-Han Luu, Dimitri Rigoussen, Kun-Feng Qiu, Jun Deng, James M. D. Day   +11 more
doaj   +2 more sources

Impact-driven oxidation of organics explains chondrite shock metamorphism dichotomy [PDF]

Nature Communications
Shocked meteorites can be used to probe the dynamics of the early Solar system. Carbonaceous chondrites are less shocked than ordinary chondrites, regardless of the degree of aqueous alteration.
Kosuke Kurosawa, Gareth S. Collins, Thomas M. Davison, Takaya Okamoto, Ko Ishibashi, Takafumi Matsui   +5 more
doaj   +2 more sources

A glimpse into ancient food storage: Sequestrichnia and associated nucleocave Chondrites from Eocene deep-sea deposits [PDF]

Acta Palaeontologica Polonica, 2022
The old brickyard Velká nad Veličkou in the Czech Republic offers a unique insight into an Eocene deep-sea ichnoassemblage that is dominated by sequestrichnia.
JAROSLAV ŠAMÁNEK, LOTHAR H. VALLON, RADEK MIKULÁŠ, MICHAL VACHEK   +3 more
doaj   +1 more source

Oxygen isotope evidence from Ryugu samples for early water delivery to Earth by CI chondrites

Nature Astronomy, 2022
The delivery of water to the inner Solar System, including Earth, is still a debated topic. A preferential role for hydrated asteroids in this process is supported by isotopic measurements. Carbonaceous chondrite (CC) meteorites represent our main source
R. Greenwood, I. Franchi, R. Findlay, J. Malley, Motoo Ito, A. Yamaguchi, M. Kimura, N. Tomioka, M. Uesugi, N. Imae, N. Shirai, T. Ohigashi, Ming‐Chang Liu, K. McCain, N. Matsuda, K. McKeegan, K. Uesugi, A. Nakato, K. Yogata, H. Yuzawa, Y. Kodama, A. Tsuchiyama, M. Yasutake, K. Hirahara, Akihisa Tekeuchi, S. Sekimoto, I. Sakurai, I. Okada, Y. Karouji, S. Nakazawa, T. Okada, T. Saiki, S. Tanaka, F. Terui, M. Yoshikawa, Akiko Miyazaki, M. Nishimura, T. Yada, M. Abe, T. Usui, Sei‐ichiro Watanabe, Y. Tsuda   +41 more
semanticscholar   +1 more source

Bubbles to Chondrites-II. Chemical fractionations in chondrites

Progress in Earth and Planetary Science, 2021
We attempt to develop a possible theory of chemical fractionations in chondrites, that is consistent with various features of chondritic components and current observation of protoplanetary disks (PPD).
Akihiko Hashimoto, Yuki Nakano
doaj   +1 more source

Constraints on the ice composition of carbonaceous chondrites from their magnetic mineralogy

Earth and Planetary Science Letters, 2021
Carbonaceous chondrites experienced varying degrees of aqueous alteration on their parent asteroids, which influenced their mineralogies, textures, and bulk chemical and isotopic compositions.
S. Sridhar, J. Bryson, A. King, R. Harrison   +3 more
semanticscholar   +1 more source

Middle Jurassic Zoophycos and Chondrites from the Mélah Formation of Saharan Atlas, Algeria [PDF]

Estonian Journal of Earth Sciences, 2019
The ichnogenera Zoophycos and Chondrites are described for the first time from the Middle Jurassic of Algeria. The trace fossil assemblage recovered from the Mélah Formation contains seven ichnospecies (Chondrites targionii, C.
Fayçal Mekki, Li-Jun Zhang, Olev Vinn, Ursula Toom, Madani Benyoucef, Mohamed Bendella, Emad Bouchemla, Mustapha Bensalah, Mohammed Adaci   +8 more
doaj   +1 more source

The message of oldhamites from enstatite chondrites

Progress in Earth and Planetary Science, 2022
We have determined rare-earth element (REE) abundances in oldhamites (CaS) from 13 unequilibrated and equilibrated enstatite chondrites (5 EH and 8 EL) and in a few enstatites by in situ, laser ablation ICP-MS.
Tahar Hammouda, Maud Boyet, Paul Frossard, Camille Cartier   +3 more
doaj   +1 more source