Impact production of C02 by the Cretaceous/Tertiary extinction bolide and the resultant heating of the Earth

@article{Okeefe1989ImpactPO,
  title={Impact production of C02 by the Cretaceous/Tertiary extinction bolide and the resultant heating of the Earth},
  author={J. D. O'keefe and Thomas J. Ahrens},
  journal={Nature},
  year={1989},
  volume={338},
  pages={247-249}
}
EVIDENCE at the Cretaceous/Tertiary boundary suggests that the proposed 'extinction' bolide1 struck a continental or shallow marine terrane. This evidence includes: shocked quartz and feld-spar grains found in the boundary layer inherited from a range of rock types2,3; a high 87Sr/86Sr ratio in some planktonic fossils4 which could reflect continental-derived Sr (ref. 5); and evidence that the platinum-group-element-rich clay layer is underlain (at some localities) by a deposit of possible… 

Biospheric effects of a large extraterrestrial impact: Case study of the cretaceous/tertiary boundary crater

The Chicxulub impact crater, buried in the Yucatan carbonate platform in Mexico, is the site of the impact purported to have caused mass extinctions at the Cretaceous/Tertiary (K/T) boundary. A

The Cretaceous/Tertiary boundary event in New Zealand: Profiling mass extinction

  • C. Hollis
  • Environmental Science, Geography
  • 2003
Abstract Of over 20 known Cretaceous/Tertiary (K/T) boundary sections in the New Zealand region, 6 in the northern South Island were selected for detailed biostratigraphic and paleoenvironmental

The extraterrestrial impact evidence at the Palaeocene–Eocene boundary and sequence of environmental change on the continental shelf

  • M. SchallerM. K. Fung
  • Environmental Science, Geography
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2018
TLDR
The observed sequence of events through the P-E boundary on the western Atlantic Coastal Plain is revisited, showing that an extraterrestrial impact led to wildfires, landscape denudation and deposition of the thick Marlboro Clay, whose base coincides with the spherule horizon and CIE onset.

Recent Achievements of the KT ( Cretaceous-Tertiary ) Boundary Researches : Review and discussion

The discovery of a gigantic crater , of which buried circular structure is located at Chicxulub, on the north coast of Yucatan , Mexico, has gained wide acceptance that the crater is probably the

An atmospheric pCO2 reconstruction across the Cretaceous-Tertiary boundary from leaf megafossils

TLDR
It is calculated that the postboundary pCO2 rise is most consistent with the instantaneous transfer of ≈4,600 Gt C from the lithic to the atmospheric reservoir by a large extraterrestrial bolide impact, which implies that severe and abrupt global warming during the earliest Paleocene was an important factor in biotic extinction at the KTB.
...

References

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Extraterrestrial Cause for the Cretaceous-Tertiary Extinction

TLDR
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.

Paleoceanography of the Cretaceous/Tertiary Boundary Event: Inferences from stable isotopic and other data

We report the results of new stable oxygen and carbon isotope analyses on carbonate fine fraction, whole rock, and benthic foraminifers, CaCO3 and coarse fraction percentage determinations, and trace

Evidence from cathodoluminescence for non-volcanic origin of shocked quartz at the Cretaceous/Tertiary boundary

Bohor et al.1 have described shocked quartz, displaying one or more sets of planar elements indexed to rational crystallographic planes, associated with anomalous siderophile abundances at the

Cretaceous Extinctions: Evidence for Wildfires and Search for Meteoritic Material

TLDR
Clay samples from three Cretaceous-Tertiary boundary sites contain a worldwide layer of soot, suggesting that soot production by large wildfires is about 10 times more efficient that has been assumed for a nuclear winter.

Mineralogic Evidence for an Impact Event at the Cretaceous-Tertiary Boundary

TLDR
A thin claystone layer found in nonmarine rocks at the palynological Cretaceous-Tertiary boundary in eastern Montana contains an anomalously high value of iridium, suggesting a high velocity impact between a large extraterrestrial body and the earth.

A Tsunami Deposit at the Cretaceous-Tertiary Boundary in Texas

At sites near the Brazos River, Texas, an iridium anomaly and the paleontologic Cretaceous-Tertiary boundary directly overlie a sandstone bed in which coarse-grained sandstone with large clasts of

The Cretaceous/Tertiary Boundary Event in the North Pacific: Planktonic foraminiferal results from Deep Sea Drilling Project Site 577, Shatsky Rise

A detailed micropaleontologic analysis of sediments from Deep-Sea Drilling Project site 577 from the Shatsky Rise, North Pacific, was undertaken to describe extinction and radiation patterns of

The carbonate-silicate geochemical cycle and its effect on atmospheric carbon dioxide over the past 100 million years

A computer model has been constructed that considers the effects on the CO/sub 2/ level of the atmosphere, and the Ca, Mg, and HCO/sub 3/ levels of the ocean, of the following processes: weathering