A collection of diverse micrometeorites recovered from 100 tonnes of Antarctic blue ice

Maurette, M.; Olinger, C. T.; Michel-Lévy, Mireille Christophe; Kurat, G.; Pourchet, M.; Brandstätter, F.; Bourot-Denise, M.

doi:10.1038/351044a0

Cited by 209 publications

(158 citation statements)

References 20 publications

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“…The same calculation for another pit from Miller Butte (18c) similar to that of sample 3 yields a 500-kyr duration. 10 (Table S5), i.e., in the same range as the estimated accumulation duration, the FRO 01149 meteorite terrestrial age and the bedrock exposure age.…”

Section: Micrometeorite Concentration Size Distribution and Collectmentioning

confidence: 72%

“…1B). The 26 Al, 10 Be, and 21 Ne cosmogenic nuclide concentrations of 2 surface granite samples yielded an exposure age of 4.4 Myr. FRO 01149, with a terrestrial age of Ϸ3 Myr, is the oldest stony meteorite discovered on Earth (fossil meteorites excluded) (16).…”

Section: Geological Settingmentioning

confidence: 99%

“…Moreover, because micrometeorites may sample a different kind of extraterrestrial matter than meteorites (2), they are very important to understanding the composition of the solar system. A number of micrometeorite collections have been studied previously, including those from deep-sea sediments (1,4,5), from secondary concentrations due to the natural melting of glacier ice in Greenland (6), Antarctica (7,8) and Novaya Zemlya (9), and from artificially melted glacier ice and snow in Antarctica (3,(10)(11)(12). Micrometeorites have also been recovered from a variety of terrestrial surfaces (desert soils, beach sands, etc.)…”

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confidence: 99%

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Micrometeorites from the Transantarctic Mountains

Rochette

Folco

Suavet

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

112

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We report the discovery of large accumulations of micrometeorites on the Myr-old, glacially eroded granitic summits of several isolated nunataks in the Victoria Land Transantarctic Mountains. The number (>3,500) of large (>400 m and up to 2 mm in size) melted and unmelted particles is orders of magnitudes greater than other Antarctic collections. Flux estimates, bedrock exposure ages and the presence of Ϸ0.8-Myr-old microtektites suggest that extraterrestrial dust collection occurred over the last 1 Myr, taking up to 500 kyr to accumulate based on 2 investigated find sites. The size distribution and frequency by type of cosmic spherules in the >200-m size fraction collected at Frontier Mountain (investigated in detail in this report) are similar to those of the most representative known micrometeorite populations (e.g., South Pole Water Well). This and the identification of unusual types in terms of composition (i.e., chondritic micrometeorites and spherulitic aggregates similar to the Ϸ480-kyr-old ones recently found in Antarctic ice cores) and size suggest that the Transantarctic Mountain micrometeorites constitute a unique and essentially unbiased collection that greatly extends the micrometeorite inventory and provides material for studies on micrometeorite fluxes over the recent (Ϸ1 Myr) geological past.

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Section: Micrometeorite Concentration Size Distribution and Collectmentioning

confidence: 72%

Section: Geological Settingmentioning

confidence: 99%

mentioning

confidence: 99%

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Micrometeorites from the Transantarctic Mountains

Rochette

Folco

Suavet

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

112

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“…Brownlee, 1985) and is referred to as interplanetary dust particles (IDPs) and in the polar ices and snows, principally in Antarctica (e.g. Maurette et al, 1991;Duprat et al, 2007), and is referred to as Antarctic micrometeorites (AMMs).…”

Section: Introductionmentioning

confidence: 99%

Oxygen isotopic composition of chondritic interplanetary dust particles: A genetic link between carbonaceous chondrites and comets

Adnot

Engrand

Leshin

et al. 2009

Geochimica et Cosmochimica Acta

108

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. Oxygen isotopic composition of chondritic interplanetary dust particles: A genetic link between carbonaceous chondrites and comets. Geochimica et Cosmochimica Acta, Elsevier, 2009, 73, pp.4558-4575. 10 Abstract Oxygen isotopes were measured in four chondritic hydrated interplanetary dust particles (IDPs) and five chondritic anhydrous IDPs including two GEMS-rich particles (Glass embedded with metal and sulfides) by a combination of high precision and high lateral resolution ion microprobe techniques.All IDPs have isotopic compositions tightly clustered around that of solar system planetary materials. Hydrated IDPs have mass-fractionated oxygen isotopic compositions similar to those of CI and CM carbonaceous chondrites, consistent with hydration of initially anhydrous protosolar dust. Anhydrous IDPs have small 16 O excesses and depletions similar to those of carbonaceous chondrites, the largest 16 O variations being hosted by the two GEMS-rich IDPs. Coarse-grained forsteritic olivine and enstatite in anhydrous IDPs are isotopically similar to their counterparts in comet Wild 2 and in chondrules suggesting a high temperature inner solar system origin. The small variations in the 16 O content of GEMS-rich IDPs suggest that most GEMS either do not preserve a record of interstellar processes or the initial interstellar dust is not 16 O-rich as expected by self-shielding models, although a larger dataset is required to verify these conclusions.Together with other chemical and mineralogical indicators, O isotopes show that the parent-bodies of carbonaceous chondrites, of chondritic IDPs, of most Antarctic micrometeorites, and comet Wild 2 belong to a single family of objects of carbonaceous chondrite chemical affinity as distinct from ordinary, enstatite, K-and R-chondrites. Comparison with astronomical observations thus suggests a chemical continuum of objects including main belt and outer solar system asteroids such as C-type, P-type and D-type asteroids, Trojans and Centaurs as well as short-period comets and other Kuiper Belt Objects.

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“…More complete collections have been obtained from ices and snows from polar regions -locations where the terrestrial dust flux is so low that micrometeorites represent a major dust component and additional separation techniques are not required (e.g. Taylor et al 1998, Maurette et al 1991, Engrand & Maurette 1998, Duprat et al 2007). These samples have permitted the construction of a classification scheme (Genge et al 2008) and allowed estimates to be made of the flux of material surviving atmospheric entry and arriving at the Earth's surface (Taylor et al 1998), highlighting the potential role of cosmic dust as a source of volatile materials to the Earth and other planets.…”

Section: Micrometeoritesmentioning

confidence: 99%

Cosmic dust in space and on Earth

Wozniakiewicz¹

2017

Astronomy &Amp; Geophysics

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A collection of diverse micrometeorites recovered from 100 tonnes of Antarctic blue ice

Cited by 209 publications

References 20 publications

Micrometeorites from the Transantarctic Mountains

Micrometeorites from the Transantarctic Mountains

Oxygen isotopic composition of chondritic interplanetary dust particles: A genetic link between carbonaceous chondrites and comets

Cosmic dust in space and on Earth

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