Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.5809h&link_type=abstract
American Astronomical Society, DPS meeting #38, #58.09; Bulletin of the American Astronomical Society, Vol. 38, p.1304
Other
Scientific paper
This study concerns extraterrestrial chromite (EC; FeCr2O4) which is a common accessory mineral in ordinary chondrites. Chromite is highly resistant to chemical erosion and weathering. Therefore, it is often the only surviving mineral of decomposed meteorites, making it useful for measuring the accretion rates of extraterrestrial material in ancient sediments.
The study shows the distribution of sediment dispersed EC grains (63-355 µm) in the Middle Ordovician (470 Ma) Komstad limestone section in the Killeröd quarry, southern Sweden. Including this study, altogether six different Middle Ordovician limestone sections in southern and central Sweden, over an area of 250 000 km2 have shown a two orders of magnitude increase in EC during at least 2 Ma. One of these sections has been studied in more detail following the discovery of fossil L chondrites within the strata.
The elemental composition of the analysed EC grains is very similar to the dominant type of chromite in equilibrated ordinary chondrites. Therefore the enrichment in EC grains 470 Ma, most likely reflects an increased flux of ordinary chondritic micrometeorites and meteorites to Earth, and is likely connected to the disruption of the L chondrite parent body in the asteroid belt at about this time.
Finally, the results of the EC search in combination with a number of other constraints have been applied in a numerical model with the aim to calculate the delivery of ordinary L-chondrite meteorites to Earth after the disruption of the L-chondrite parent body. It is hypothesized that the fossil meteorites found in the Thorsberg quarry were transported to Earth in the immediate aftermath of the large collision in the inner asteroid belt that produced the Flora asteroid family.
Häggström Therese S.
Nesvorný David
Schmitz Barbara
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