Maribo—A new CM fall from Denmark

Haack, H.; Grau, Thomas; Bischoff, A.; Horstmann, M.; Wasson, J. T.; Sørensen, Anton Norup; Laubenstein, M.; Ott, U.; Palme, H.; Gellissen, M.; Greenwood, Richard C.; Pearson, Victoria K.; Franchi, I. A.; Gabélica, Z.; Schmitt‐Kopplin, Philippe

doi:10.1111/j.1945-5100.2011.01311.x

Cited by 79 publications

(90 citation statements)

References 57 publications

(121 reference statements)

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“…McSween and Weissman 1989;Campins and Swindle 1998;Gounelle et al 2006;Weisberg and Connolly 2008;Haack et al 2011). Recently, a piece of carbon-rich material found in Egypt and nicknamed Hypatia has been interpreted as originating from a comet that exploded over Africa 35 Myr ago and made the Lybian glass strewnfield (Kramers et al 2013).…”

Section: Measurements In Cometary Dust and Analogsmentioning

confidence: 99%

Cometary Isotopic Measurements

et al. 2015

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Section: Measurements In Cometary Dust and Analogsmentioning

confidence: 99%

Cometary Isotopic Measurements

et al. 2015

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“…Moreover, CM chondrites are represented by a wide petrological range (from weakly altered [2.9] to fully altered [2.0]) corresponding to various degrees of aqueous alteration (Rubin et al, 2007). Recent CM chondrite acquisitions of the Paris (find, unknown location, 2001) and Maribo (fall, Denmark, 2009) meteorites add to this range by representing the most unaltered CM chondrites to date (petrological type > 2.8, Zanda et al, 2010;Haack et al, 2012;Hewins et al, 2014). This makes CM chondrites unique samples to study the complete spectrum of aqueous alteration.…”

Section: Introductionmentioning

confidence: 99%

“…The recent fall of Maribo, a CM chondrite characterized as 'highly unaltered' (Haack et al, 2012), provides a unique opportunity to study the early stages of aqueous alteration on the CM chondrite parent body. Here, we investigate the matrix mineralogy of Maribo by transmission electron microscopy (TEM), the H, N and C isotope composition of the matrix by secondary ion mass spectrometry (SIMS) and the structure of organic matter by electron energy loss spectroscopy (EELS).…”

Section: Introductionmentioning

confidence: 99%

Isotope record of mineralogical changes in a spectrum of aqueously altered CM chondrites

Kooten

Nagashima

Kasama

et al. 2018

Geochimica et Cosmochimica Acta

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The recent fall of the relatively unaltered CM chondrite Maribo provides a unique opportunity to study the early stages of aqueous alteration on the CM chondrite parent body. We show using transmission electron microscopy of a matrix FIBsection from Maribo that this meteorite mainly appears to consist of tochilinite-cronstedtite intergrowths (TCIs), but also contains regions of amorphous or nanocrystalline silicates, anhydrous silicates and FeNi metal aggregates with thin iron oxide rims, suggesting that it experienced aqueous alteration to a relatively small degree. A comparison of Maribo with increasingly altered CM chondrites such as Jbilet Winselwan and Bells shows that during progressive aqueous alteration (1) the TCIs are replaced by coarser sulfides and increasingly Mg-rich serpentine, and (2) the abundance of 15 N-rich hotspots increases, whereas the magnitude of their 15 N enrichment decreases. We observe that the overall N isotope variability related to aqueous alteration is an order of magnitude lower than the variability observed between different chondrite groups. We suggest these high order differences are the result of heterogeneous accretion of insoluble or soluble organic carriers of 15 N to the different chondrite parent bodies. D/H ratios of matrices from Maribo, Jbilet Winselwan and Bells increase with progressive aqueous alteration, a trend that is opposite to expectations of mixing between D-poor water and D-rich organic matter. We argue that this behaviour cannot be related to Fe oxidation or serpentinization reactions and subsequent loss of D-poor H 2 gas. We offer an alternative hypothesis and suggest that CM chondrites experienced two-stage aqueous alteration. During the first stage occurring at relatively low temperature, mixing of increasing amounts of D-poor water with D-rich organic matter results in a decrease of D/H ratio with increasing degree of alteration. During the second stage of alteration occurring at relatively high temperature (T < 300°C), decomposition of TCIs in CMs of petrologic type <2.7 releases gaseous D-poor water that results in increase of the D/H ratio of the CM matrices. Finally, we report on changes in the organic structure of Maribo, Jbilet Winselwan and Bells using Carbon-K and Nitrogen-K edge electron energy loss spectroscopy. The organic matter initially has higher aromatic/aliphatic ratios (e.g., Maribo) and lower abundances of ketone and carboxyl functional groups, which we suggest are the result of chemical degradation of double bonded carbon from oxidation during hydrothermal

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“…Maribo and Sutter's Mill are CM chondrites that fell on January 17, 2009 (Haack et al 2012) and on April 22, 2012(Jenniskens et al 2012b). The pre-atmospheric orbits of the two meteorites are very similar and places them right in the middle of the Taurid meteoroid stream (Haack et al 2011;Jenniskens et al 2012b).…”

Section: Introductionmentioning

confidence: 99%

2P/Encke, the Taurid complex NEOs and the Maribo and Sutter’s Mill meteorites

Tubiana

Snodgrass

Michelsen

et al. 2015

A&A

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Aims. 2P/Encke is a short period comet that was discovered in 1786 and has been extensively observed and studied for more than 200 years. The Taurid meteoroid stream has long been linked with 2P/Encke owing to a good match of their orbital elements, even though the comet's activity is not strong enough to explain the number of observed meteors. Various small near-Earth objects (NEOs) have been discovered with orbits that can be linked to 2P/Encke and the Taurid meteoroid stream. Maribo and Sutter's Mill are CM type carbonaceous chondrite that fell in Denmark on January 17, 2009 and April 22, 2012, respectively. Their pre-atmospheric orbits place them in the middle of the Taurid meteoroid stream, which raises the intriguing possibility that comet 2P/Encke could be the parent body of CM chondrites. Methods. To investigate whether a relationship between comet 2P/Encke, the Taurid complex associated NEOs, and CM chondrites exists, we performed photometric and spectroscopic studies of these objects in the visible wavelength range. We observed 2P/Encke and 10 NEOs on August 2, 2011 with the FORS instrument at the 8.2 m Very Large Telescope on Cerro Paranal (Chile). Results. Images in the R filter, used to investigate the possible presence of cometary activity around the nucleus of 2P/Encke and the NEOs, show that no resolved coma is present. None of the FORS spectra show the 700 nm absorption feature due to hydrated minerals that is seen in the CM chondrite meteorites. All objects show featureless spectra with moderate reddening slopes at λ < 800 nm. Apart for 2003 QC 10 and 1999 VT 25 , which show a flatter spectrum, the spectral slope of the observed NEOs is compatible with that of 2P/Encke. However, most of the NEOs show evidence of a silicate absorption in lower S/N data at λ > 800 nm, which is not seen in 2P/Encke, which suggests that they are not related. Conclusions. Despite similar orbits, we find no spectroscopic evidence for a link between 2P/Encke, the Taurid complex NEOs and the Maribo and Sutter's Mill meteorites. However, we cannot rule out a connection to the meteorites either, as the spectral differences may be caused by secondary alteration of the surfaces of the NEOs.

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Maribo—A new CM fall from Denmark

Cited by 79 publications

References 57 publications

Cometary Isotopic Measurements

Cometary Isotopic Measurements

Isotope record of mineralogical changes in a spectrum of aqueously altered CM chondrites

2P/Encke, the Taurid complex NEOs and the Maribo and Sutter’s Mill meteorites

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