Impact splash chondrule formation during planetesimal recycling
Chondrules, mm-sized igneous-textured spherules, are the dominant bulk silicate constituent of chondritic meteorites and originate from highly energetic, local processes during the first million years after the birth of the Sun. So far, an astrophysically consistent chondrule formation scenario expl...
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| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
[2018]$n2017
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| In: |
Icarus
Year: 2018, Jahrgang: 302, Pages: 27-43 |
| ISSN: | 0019-1035 |
| DOI: | 10.1016/j.icarus.2017.11.004 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1016/j.icarus.2017.11.004 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0019103517302488 
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| Verfasserangaben: | Tim Lichtenberg, Gregor J. Golabek, Cornelis P. Dullemond, Maria Schönbächler, Taras V. Gerya, Michael R. Meyer |
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| 245 | 1 | 0 | |a Impact splash chondrule formation during planetesimal recycling |c Tim Lichtenberg, Gregor J. Golabek, Cornelis P. Dullemond, Maria Schönbächler, Taras V. Gerya, Michael R. Meyer |
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| 520 | |a Chondrules, mm-sized igneous-textured spherules, are the dominant bulk silicate constituent of chondritic meteorites and originate from highly energetic, local processes during the first million years after the birth of the Sun. So far, an astrophysically consistent chondrule formation scenario explaining major chemical, isotopic and textural features, in particular Fe,Ni metal abundances, bulk Fe/Mg ratios and intra-chondrite chemical and isotopic diversity, remains elusive. Here, we examine the prospect of forming chondrules from impact splashes among planetesimals heated by radioactive decay of short-lived radionuclides using thermomechanical models of their interior evolution. We show that intensely melted planetesimals with interior magma oceans became rapidly chemically equilibrated and physically differentiated. Therefore, collisional interactions among such bodies would have resulted in chondrule-like but basaltic spherules, which are not observed in the meteoritic record. This inconsistency with the expected dynamical interactions hints at an incomplete understanding of the planetary growth regime during the lifetime of the solar protoplanetary disk. To resolve this conundrum, we examine how the observed chemical and isotopic features of chondrules constrain the dynamical environment of accreting chondrite parent bodies by interpreting the meteoritic record as an impact-generated proxy of early solar system planetesimals that underwent repeated collision and reaccretion cycles. Using a coupled evolution-collision model we demonstrate that the vast majority of collisional debris feeding the asteroid main belt must be derived from planetesimals which were partially molten at maximum. Therefore, the precursors of chondrite parent bodies either formed primarily small, from sub-canonical aluminum-26 reservoirs, or collisional destruction mechanisms were efficient enough to shatter planetesimals before they reached the magma ocean phase. Finally, we outline the window in parameter space for which chondrule formation from planetesimal collisions can be reconciled with the meteoritic record and how our results can be used to further constrain early solar system dynamics. | ||
| 650 | 4 | |a Chondrule formation | |
| 650 | 4 | |a Meteorites | |
| 650 | 4 | |a Planetary formation | |
| 650 | 4 | |a Planetesimals | |
| 650 | 4 | |a Thermal histories | |
| 700 | 1 | |a Golabek, Gregor J. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Dullemond, Cornelis |e VerfasserIn |0 (DE-588)1028065167 |0 (DE-627)73025917X |0 (DE-576)260098310 |4 aut | |
| 700 | 1 | |a Schönbächler, Maria |e VerfasserIn |4 aut | |
| 700 | 1 | |a Gerya, Taras V. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Meyer, Michael R. |e VerfasserIn |4 aut | |
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