Express delivery of fossil meteorites from the inner asteroid belt to Sweden

Nesvorný, David; Vokrouhlický, David; Bottke, W. F.; Gladman, Brett; Häggström, Therese

doi:10.1016/j.icarus.2006.11.021

Cited by 43 publications

(23 citation statements)

References 63 publications

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“…The high fossil meteorite density and their L-chondrite composition (Schmitz et al 2001) in sediments of middle Ordovician age, their low exposure ages and the exposure age gradient, in accordance with theoretical predictions for a major asteroid breakup, confirm that the fossil meteorites are debris of the L-chondrite parent body breakup event near an important orbital resonance in the inner asteroid belt (Heck et al 2004). It has been suggested that the L-chondrite parent body breakup was related to the generation of the Flora asteroid family (Nesvorn˝ et al 2002(Nesvorn˝ et al , 2007 upon the disruption of a 185 km large asteroid (Durda et al 2007).…”

Section: Introductionsupporting

confidence: 75%

“…The base of the Arkeologen bed contains fossil meteorites which had arrived on Earth just about one to two hundred thousand years after having been generated in the L-chondrite parent body breakup (Heck et al 2004). Such a fast delivery for meteorites is expected if the asteroid collision occurred close to a major orbital resonance in the inner asteroid belt (Gladman et al 1997;Zappalà et al 1998;Nesvorn˝ et al 2007). Two of the most important resonances are the 3:1 orbital resonance with Jupiter at about 2.5 AU and the v 6 resonance with Saturn and Jupiter.…”

Section: Dynamical Constraints On the Lifetime Of Dust From The L-chomentioning

confidence: 99%

“…It is likely that these two resonances played a major role in the delivery of asteroidal material to Earth. The delivery of material after breakup of the Flora family parent body through the v 6 -resonance has been modeled recently (Nesvorn˝ et al 2007). This model can explain the short exposure ages of the fossil meteorites from Thorsberg.…”

Section: Dynamical Constraints On the Lifetime Of Dust From The L-chomentioning

confidence: 99%

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Noble gases in fossil micrometeorites and meteorites from 470 Myr old sediments from southern Sweden, and new evidence for the L‐chondrite parent body breakup event

Heck

Schmitz

Baur

et al. 2008

Meteorit & Planetary Scien

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Abstract-We present noble gas analyses of sediment-dispersed extraterrestrial chromite grains recovered from ~470 Myr old sediments from two quarries (Hällekis and Thorsberg) and of relict chromites in a coeval fossil meteorite from the Gullhögen quarry, all located in southern Sweden. Both the sediment-dispersed grains and the meteorite Gullhögen 001 were generated in the Lchondrite parent body breakup about 470 Myr ago, which was also the event responsible for the abundant fossil meteorites previously found in the Thorsberg quarry. Trapped solar noble gases in the sediment-dispersed chromite grains have partly been retained during ~470 Myr of terrestrial residence and despite harsh chemical treatment in the laboratory. This shows that chromite is highly retentive for solar noble gases. The solar noble gases imply that a sizeable fraction of the sedimentdispersed chromite grains are micrometeorites or fragments thereof rather than remnants of larger meteorites. The grains in the oldest sediment beds were rapidly delivered to Earth likely by direct injection into an orbital resonance in the inner asteroid belt, whereas grains in younger sediments arrived by orbital decay due to Poynting-Robertson (P-R) drag. The fossil meteorite Gullhögen 001 has a low cosmic-ray exposure age of ~0.9 Myr, based on new He and Ne production rates in chromite determined experimentally. This age is comparable to the ages of the fossil meteorites from Thorsberg, providing additional evidence for very rapid transfer times of material after the L-chondrite parent body breakup.

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Section: Introductionsupporting

confidence: 75%

Section: Dynamical Constraints On the Lifetime Of Dust From The L-chomentioning

confidence: 99%

Section: Dynamical Constraints On the Lifetime Of Dust From The L-chomentioning

confidence: 99%

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Noble gases in fossil micrometeorites and meteorites from 470 Myr old sediments from southern Sweden, and new evidence for the L‐chondrite parent body breakup event

Heck

Schmitz

Baur

et al. 2008

Meteorit & Planetary Scien

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mentioning

confidence: 99%

“…The L chondrite parent body break-up at 470 Ma is thought to have created the Flora family of asteroids 25 . These asteroids were particularly prone to enter Earth-crossing orbits because of their position relative to an important orbital resonance 24,25 . Apparently the mid-Ordovician interval with enhanced extraterrestrial flux is broadly coincident with the main phase of the GOBE [1][2][3]16 .…”

mentioning

confidence: 99%

Asteroid breakup linked to the Great Ordovician Biodiversification Event

et al. 2007

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Population of Impactors and the Impact Cratering Rate in the Inner Solar System

Michel¹,

Morbidelli²

2012

Impact Cratering

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The investigation of the surface histories of the solid planets and satellites is a major objective of planetary exploration. Most solid bodies in the Solar System display a record of accumulated impact cratering on their surfaces. These craters range in size from a few metres or smaller in diameter to hundreds of thousands of kilometres (e.g. giant basins on the Moon, Mars and Mercury). Assuming a constant impact rate with time, the age of a surface is proportional to the number of impacts it has experienced. Thus, if it is possible to estimate the rate of crater production on a surface, then the total number of craters can allow the estimate of the age of this surface. However, the cratering rate on a planet is related to the population of projectiles, in particular their orbital and size distribution. The determination of cratering rates, therefore, requires a good knowledge of the population of potential impactors, which allows the determination of their impact frequencies on planets. Then, a good understanding of the cratering process itself is required to establish the relationship between the diameters of the crater and the projectile, as a function of the projectile's mass, velocity, impact angle and planetary characteristics.The only absolute chronology of craters up to 3.8 Ga that has been studied in detail so far is the lunar case, which was calibrated by dating of lunar samples brought back by the Apollo missions. The lunar crater-production function is the best investigated among those on terrestrial planet surfaces, as it is based on a large image database at various resolutions. Conversely, we do not yet have any samples of known portions of the Martian surface, and this is the main reason why different models have been developed to estimate the Martian cratering rate, with the goal of establishing a Martian surface chronology. On Earth, the situation is even worse, as the geological activity is high and several mechanisms (e.g. erosion, plate tectonics) erase crater features over time, making the cratering record incomplete (see Chapter 16). Of the terrestrial planets, only the Moon, Mercury and Mars Impact Cratering: Processes and Products, First Edition. Edited by Gordon R. Osinski and Elisabetta Pierazzo. have heavily cratered surfaces, and all these surfaces have complex crater size distributions. For instance, the crater distributions of Mercury and Mars at diameters less than 40 km are steeper than the lunar distribution due to the obliteration of a fraction of small craters by plains formation (Strom et al., 2005). On Venus, the crater density is an order of magnitude less than on Mars. The reason is twofold: (1) only young craters are present due to resurfacing events, which erased older craters;(2) small craters on this planet are rare because the small impactors cannot penetrate the thick atmosphere. Finally, the crater counting can be affected by the potential presence of secondary and multiple craters (Bierhaus et al., 2005).The cratering record of the outer Solar System suffers from e...

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Express delivery of fossil meteorites from the inner asteroid belt to Sweden

Cited by 43 publications

References 63 publications

Noble gases in fossil micrometeorites and meteorites from 470 Myr old sediments from southern Sweden, and new evidence for the L‐chondrite parent body breakup event

Noble gases in fossil micrometeorites and meteorites from 470 Myr old sediments from southern Sweden, and new evidence for the L‐chondrite parent body breakup event

Asteroid breakup linked to the Great Ordovician Biodiversification Event

Population of Impactors and the Impact Cratering Rate in the Inner Solar System

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