The old, unique C1 chondrite Flensburg – Insight into the first processes of aqueous alteration, brecciation, and the diversity of water-bearing parent bodies and lithologies

Bischoff, A.; Alexander, C. M. O'd.; Barrat, Jean‐Alix; Burkhardt, C.; Busemann, H.; Degering, D.; Rocco, Tommaso Di; Fischer, Meike; Fockenberg, Thomas; Foustoukos, Dionysis I.; Gattacceca, J.; Godinho, José R. A.; Harries, Dennis; Heinlein, D.; Hellmann, Jan L.; Hertkorn, Norbert; Holm, Anja; Jull, A. J. T.; Kerraouch, I.; King, Ashley; Kleine, T.; Koll, Dominik; Lachner, Johannes; Ludwig, Thomas; Merchel, Silke; Mertens, Cornelia; Morino, Précillia; Neumann, Wladimir; Pack, Andreas; Patzek, M.; Pavetich, Stefan; Reitze, Maximilian P.; Rüfenacht, Miriam; Rugel, G.; Schmidt, Charlotte; Schmitt‐Kopplin, Philippe; Schönbächler, Maria; Trieloff, M.; Wallner, A.; Wimmer, K.; Wölfer, Elias

doi:10.1016/j.gca.2020.10.014

Cited by 34 publications

(62 citation statements)

References 193 publications

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“…2019), but different to the ungrouped C1 chondrite Flensburg (Bischoff et al. 2021). The phyllosilicate composition in the studied C1 lithology is unlike that of the CM lithologies in Aguas Zarcas (Fig.…”

Section: Discussionmentioning

confidence: 83%

“…2010; Bischoff et al. 2021). Fe in most type 1 and 2 chondrites is partially to completely oxidized or sulfidized.…”

Section: Discussionmentioning

confidence: 99%

“…Unique meteorites, xenolithic clasts, and dark inclusions in brecciated meteorites (e.g., Zolensky and Ivanov 2003; Bischoff et al. 2006, 2018, 2021; Horstmann and Bischoff 2014; Patzek et al. 2018a, 2018b; Kerraouch et al.…”

Section: Discussionmentioning

confidence: 99%

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The polymict carbonaceous breccia Aguas Zarcas: A potential analog to samples being returned by the OSIRIS‐REx and Hayabusa2 missions

Kerraouch

Bischoff

Zolensky

et al. 2021

Meteorit & Planetary Scien

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On April 23, 2019, a meteorite fall occurred in Aguas Zarcas, Costa Rica. According to the Meteoritical Bulletin, Aguas Zarcas is a brecciated CM2 chondrite dominated by two lithologies. Our X‐ray computed tomography (XCT) results show many different lithologies. In this paper, we describe the petrographic and mineralogical investigation of five different lithologies of the Aguas Zarcas meteorite. The bulk oxygen isotope compositions of some lithologies were also measured. The Aguas Zarcas meteorite is a breccia at all scales. From two small fragments, we have noted five main lithologies, including (1) Met‐1: a metal‐rich lithology; (2) Met‐2: a second metal‐rich lithology which is distinct from Met‐1; (3) a brecciated CM lithology with clasts of different petrologic subtypes; (4) a C1/2 lithology; and (5) a C1 lithology. The Met‐1 lithology is a new and unique carbonaceous chondrite which bears similarities to CR and CM chondrite groups, but is distinct from both based on oxygen isotope data. Met‐2 also represents a new type of carbonaceous chondrite, but it is more similar to the CM chondrite group, albeit with a very high abundance of metal. We have noted some similarities between the Met‐1 and Met‐2 lithologies and will explore possible genetic relationships. We have also identified a brecciated CM lithology with two primary components: a chondrule‐poor lithology and a chondrule‐rich lithology showing different petrologic subtypes. The other two lithologies, C1 and C1/2, are very altered and possibly related to the CM chondrite group. In this article, we describe all the lithologies in detail and attempt a classification of each in order to understand the origin and the history of formation of the Aguas Zarcas parent body.

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Section: Discussionmentioning

confidence: 83%

“…2010; Bischoff et al. 2021). Fe in most type 1 and 2 chondrites is partially to completely oxidized or sulfidized.…”

Section: Discussionmentioning

confidence: 99%

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The polymict carbonaceous breccia Aguas Zarcas: A potential analog to samples being returned by the OSIRIS‐REx and Hayabusa2 missions

Kerraouch

Bischoff

Zolensky

et al. 2021

Meteorit & Planetary Scien

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“…In contrast to its young CRE, Flensburg contains very old carbonates, not affected since their formation 4564 Myr ago (Bischoff et al 2021). This fact may be related to the location of its parent asteroid farther from the Sun, where collisions are less frequent and less energetic, than for most other meteorites.…”

Section: Discussionmentioning

confidence: 99%

“…The most important fact revealed by this study is that the Flensburg meteoroid was in the 5:2 resonance with Jupiter located at 2.82 AU. Since the resonance is able to quickly raise the orbital eccentricity and thus bring the meteoroid into an Earth crossing orbit, it explains the extremely short cosmic ray exposure age (CRE) of about 7 kyr (Bischoff et al 2021). The parent asteroid of Flensburg was very probably orbiting close to the inner or outer edge of the resonance, so that Flensburg entered the resonance soon after being ejected by a collisional event.…”

Section: Discussionmentioning

confidence: 99%

Trajectory and orbit of the unique carbonaceous meteorite Flensburg

Borovička¹,

Bettonvil

Baumgarten

et al. 2021

Meteorit & Planetary Scien

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The C1-ungrouped carbonaceous chondrite Flensburg fell in Germany on September 12, 2019, in the daytime. We determined the atmospheric trajectory, velocity, and heliocentric orbit using one dedicated AllSky6 meteor camera and three casual video records of the bolide. It was found that the meteorite originated in the vicinity of the 5:2 resonance with Jupiter at heliocentric distance of 2.82 AU. When combined with the bolide energy reported by the United States government sensors (USGS), the preatmospheric diameter of the meteoroid was estimated to be 2-3 m and the mass to be 10,000-20,000 kg. The meteoroid fragmented heavily in the atmosphere at heights of 46-37 km, under dynamic pressures of 0.7-2 MPa. The recovery of just one meteorite suggests that only a very small part of the original mass reached the ground. The bolide velocity vector was compared with that reported by the USGS. There is good agreement in the radiant but the velocity value has been underestimated by the USGS by almost 1 km s À1 .

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Meteorite

Okrusch

Frimmel

2022

Mineralogie

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The old, unique C1 chondrite Flensburg – Insight into the first processes of aqueous alteration, brecciation, and the diversity of water-bearing parent bodies and lithologies

Cited by 34 publications

References 193 publications

The polymict carbonaceous breccia Aguas Zarcas: A potential analog to samples being returned by the OSIRIS‐REx and Hayabusa2 missions

The polymict carbonaceous breccia Aguas Zarcas: A potential analog to samples being returned by the OSIRIS‐REx and Hayabusa2 missions

Trajectory and orbit of the unique carbonaceous meteorite Flensburg

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