Discovery of a 25-cm asteroid clast in the giant Morokweng impact crater, South Africa
@article{Maier2006DiscoveryOA, title={Discovery of a 25-cm asteroid clast in the giant Morokweng impact crater, South Africa}, author={Wolfgang D. Maier and Marco A. G. Andreoli and Iain McDonald and Michael Denis Higgins and Adrian J Boyce and Alexander Shukolyukov and Gunter W. Lugmair and Lewis D. Ashwal and Peter P. H. Gr{\"a}ser and Edward M. Ripley and Rodger J. Hart}, journal={Nature}, year={2006}, volume={441}, pages={203-206} }
Meteorites provide a sample of Solar System bodies and so constrain the types of objects that have collided with Earth over time. Meteorites analysed to date, however, are unlikely to be representative of the entire population and it is also possible that changes in their nature have occurred with time. Large objects are widely believed to be completely melted or vaporized during high-angle impact with the Earth. Consequently, identification of large impactors relies on indirect chemical…
78 Citations
40Ar/39Ar thermochronology of the fossil LL6-chondrite from the Morokweng crater, South Africa
- Geology, Geography
- 2010
Determining the impactor of the Ordovician Lockne crater: Oxygen and neon isotopes in chromite versus sedimentary PGE signatures
- Geology, Geography
- 2011
Dark primitive asteroids account for a large share of K/Pg-scale impacts on the Earth
- Physics, Geology
- 2021
An asteroid breakup 160 Myr ago as the probable source of the K/T impactor
- Geology, PhysicsNature
- 2007
It is argued that this apparent surge in impact flux was triggered by the catastrophic disruption of the parent body of the asteroid Baptistina, which it is inferred was a ∼170-km-diameter body (carbonaceous-chondrite-like) that broke up Myr ago in the inner main asteroid belt.
Projectile Identification in Terrestrial Impact Structures and Ejecta Material
- Geology
- 2012
Next to the rare finds of meteorite fragments in or near impact structures, a handful of geochemical methods can be applied to confirm the impact origin of a structure and to constrain the nature of…
Timescales of impact melt sheet crystallization and the precise age of the Morokweng impact structure, South Africa
- Geology, GeographyEarth and Planetary Science Letters
- 2021
On the track of the elusive Sudbury impact: geochemical evidence for a chondrite or comet bolide
- Geology
- 2015
Siderophile and lithophile trace element data for 69 samples from the Sudbury impact crater fill (Onaping Formation) and quartz diorite offset dikes help constrain the sources of the established…
A tungsten isotope approach to search for meteoritic components in terrestrial impact rocks
- Geology
- 2009
The Cape York Meteorites, the Younger Dryas, and Their Possible Association with the Hiawatha and Paterson Impact Craters
- Geology, Environmental Science
- 2020
The recent discovery of the Hiawatha and Paterson impact craters in north-western Greenland has motivated three intriguing questions: are they associated with the Cape York meteorites, did they form…
References
SHOWING 1-10 OF 45 REFERENCES
A meteorite from the Cretaceous/Tertiary boundary
- Geology, PhysicsNature
- 1998
Cretaceous/Tertiary boundary sediments are now widely recognized to contain the record of a large asteroid or comet impact event, probably at the site of the Chicxulub crater on the Yucatan…
Morokweng, South Africa: A large impact structure of Jurassic-Cretaceous boundary age
- Geology, Geography
- 1997
Geophysical, petrographical, and geochemical data indicate the presence of a large impact structure in the area around Morokweng, Northwest Province, South Africa, possibly up to 340 km in diameter.…
Terrestrial Impact: The Record in the Rocks
- Geology
- 1991
— Approximately 130 terrestrial craters are currently known. They range up to 140 km, and perhaps as much as 200 km, in diameter and from Recent to ∼2 billion years in age. The known sample, however,…
Unmelted meteoritic debris collected from Eltanin ejecta in Polarstern cores from expedition ANT XII/4
- Geology
- 2002
Geochemical search for impact signatures in possible impact-generated units associated with the Jurassic-Cretaceous Boundary in Southern England and Northern France
- Geology, Environmental Science
- 2006
Understanding of the extinction event at the Jurassic-Cretaceous (J/K) boundary is hampered by problems of faunal isolation and lack of comparable magneto- and biostratigraphy between the Boreal and…
Isotopic evidence for the Cretaceous-Tertiary impactor and its type.
- GeologyScience
- 1998
High-precision mass spectrometric analysis of chromium in sediment samples from the Cretaceous-Tertiary (K-T) boundary coincident with the extinction of numerous organisms on Earth confirms the…