A meteorite from the Cretaceous/Tertiary boundary

  title={A meteorite from the Cretaceous/Tertiary boundary},
  author={Frank T. Kyte},
  • F. Kyte
  • Published 1 November 1998
  • Geology, Physics
  • Nature
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 peninsula. After nearly two decades of intensive research, however, much remains unknown about the specific nature of the projectile and of the impact event itself. Here we describe a 2.5-mm fossil meteorite found in sediments retrieved from the Cretaceous/Tertiary boundary in the North Pacific Ocean that we… 

Two large meteorite impacts at the Cretaceous-Paleogene boundary

The end-Cretaceous mass extinction has been attributed by most to a single asteroid impact at Chicxulub on the Yucatan Peninsula, Mexico. The discovery of a second smaller crater with a similar age

The petrology and geochemistry of the impactite sequence and selected target rocks from the Yaxcopoil-1 borehole, Chicxulub Impact Structure, Yucatan Peninsula, Mexico

Geological and geophysical investigations of the Chicxulub meteorite impact structure have been ongoing since its scientific recognition in 1991 (Hildebrand et al. 1991). The structure is of

The oldest impact deposits on Earth - First confirmation of an extraterrestrial component

The chromium isotopic compositions of samples from an early Archean (3.22 Ga) spherule bed (S4) from the Barberton Greenstone Belt, South Africa, are distinct from that in background rocks and other

Discovery of a 25-cm asteroid clast in the giant Morokweng impact crater, South Africa

The discovery of a large (25-cm), unaltered, fossil meteorite and several smaller fragments within the impact melt of the giant Morokweng crater, South Africa, suggests that the MorokWeng asteroid incorporated part of the LL chondrite parent body not represented by objects at present reaching the Earth.

Remnants of altered meteorite in the Cretaceous‐Paleogene clay boundary in Poland

Fossil iron meteorites are extremely rare in the geological sedimentary record. The paleometeorite described here is the first such finding at the Cretaceous‐Paleogene (K‐Pg) boundary. In the

Chondritic Meteorite Fragments Associated with the Permian-Triassic Boundary in Antarctica

In one sample, the meteoritic fragments are accompanied by more abundant discrete metal grains, which are also found in an end-Permian bed at Meishan, southern China, and the implications for a suggested global impact event at the Permian-Triassic boundary are discussed.

The flux of extraterrestrial matter to Earth as recorded in Paleogene and Middle Ordovician marine sediments

This thesis aims at reconstructing events in the solar system, mainly collisional events in the asteroid belt, by searches for extraterrestrial minerals in Paleogene and Middle Ordovician marine

A short duration of the Cretaceous-Tertiary boundary event: evidence from extraterrestrial helium-3.

This observation indicates that the bolide associated with the Cretaceous-Tertiary (K-T) extinction event was not accompanied by enhanced solar system dustiness and so could not have been a member of a comet shower.

Spherules associated with the cretaceous–paleogene boundary in Poland

The succession of the Lechowka section near Chelm in south-eastern Poland presents the first complete record of the Cretaceous–Paleogene (K–Pg) boundary in Poland. Samples of the boundary clay were



Chicxulub Crater: A possible Cretaceous/Tertiary boundary impact crater on the Yucatán Peninsula, Mexico

We suggest that a buried 180-km-diameter circular structure on the Yucatan Peninsula, Mexico, is an impact crater. Its size and shape are revealed by magnetic and gravity-field anomalies, as well as

Evidence for a K/T impact event in the Pacific Ocean

THE chemical, mineralogical and isotopic characteristics of deposits at the Cretaceous/Tertiary (K/T) boundary are suggestive of a large impact event, the prime candidate1 being the Chicxulub crater

Middle Ordovician chondrite in fossiliferous limestone from Brunflo, central Sweden

The few discoveries of fossil meteorites have been attributed1 to the ignorance about the appearance of meteorites among palaeontologists and other geologists who examine limestone quarries, coal

Extraterrestrial Cause for the Cretaceous-Tertiary Extinction

A hypothesis is suggested which accounts for the extinctions and the iridium observations, and the chemical composition of the boundary clay, which is thought to come from the stratospheric dust, is markedly different from that of clay mixed with the Cretaceous and Tertiary limestones, which are chemically similar to each other.

Geological record and reconstruction of the late Pliocene impact of the Eltanin asteroid in the Southern Ocean

The explosive force inferred for this event places it at the threshold of impacts believed to have global consequences, and its studyshould therefore provide a baseline for the reconstruction and modelling of similar events, which are common on geological timescales.

Carbonaceous micrometeorites from Antarctica.

Applications of micrometeorite studies that have been previously presented to exobiologists but deal with the synthesis of prebiotic molecules on the early Earth, and more recently, with the early history of the solar system are discussed.