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Chondrule formation in the outer disk from the primary three-dimensional chemical composition of CM chondrules — arXiv:2608.12931

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.12931
License (as archived): CC0-1.0
Archived: 2026-10-19T05:08:39.927Z
SHA-256 of the archived text: 83574cf39405c0e6080f51f5fd0fef459620d492aaded022c0d7a1ad33b66807
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How to cite

Chondrule formation in the outer disk from the primary three-dimensional chemical composition of CM chondrules — arXiv:2608.12931 — arXiv (en), https://arxiv.org/abs/2608.12931 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_ec37fa576cbe (Metraipolis archive dc_ec37fa576cbe, sha256 83574cf39405c0e6080f51f5fd0fef459620d492aaded022c0d7a1ad33b66807)

BibTeX

@misc{dcec37fa576cbe,
  title = {Chondrule formation in the outer disk from the primary three-dimensional chemical composition of CM chondrules — arXiv:2608.12931},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.12931},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_ec37fa576cbe; sha256 83574cf39405c0e6080f51f5fd0fef459620d492aaded022c0d7a1ad33b66807},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.12931. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Chondrules and their associated fine-grained rims record key processes in the early protoplanetary disk, yet the links between chondrule chemistry, morphology, and matrix complementarity remain poorly constrained. We investigate the major, minor, and trace element compositions of 66 chondrules and FGRs from the relatively unaltered CM carbonaceous chondrites Asuka 12236, Paris, and Maribo, together with their 3D morphology, using LA-ICP-MS and X-ray tomography. CM chondrules record systematic metal loss and evaporation of Si-rich mesostasis, driving initially CI-like precursor compositions toward more Mg- and Si-rich bulk compositions along the CI ratio line and toward increasingly Si-poor forsteritic assemblages. GEMS-like materials in pristine CM matrices closely mirror chondrule compositions and likely represent complementary condensates derived from evaporated mesostasis. Dust accreted onto chondrules is predominantly CI-like but contains about 14 wt.% complementary condensate material represented by chondritic amorphous silicates, reconciling Mg/Si complementarity between chondrules and matrix with the preservation of primordial organics and presolar grains. Morphological observations show no significant sectioning bias, consistent with CM chondrules being dominated by agglomerates of ~100 um microspherules. Many display grape-bunch textures produced by welding of smaller chondrules with metal-rich or CI-like rims. This structure may explain the chondrule moderately volatile-element plateau at about 0.3xCI. We propose a "micro-chondrule-first" scenario in which localized heating events produced small molten droplets that subsequently accreted CI-like dust and ice, aggregated, and experienced limited aqueous alteration. These observations place new constraints on chondrule formation in the outer disk and highlight the importance of localized melting and aggregation processes.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-08-14 in astro-ph.EP).
Categorie arXiv: Earth and Planetary Astrophysics (astro-ph.EP).
Pagina del lavoro: https://arxiv.org/abs/2608.12931 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-19T05:00:24.499Z dalla pagina https://arxiv.org/catchup/astro-ph.EP/2026-08-14?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).