Post-depositional mobility of platinum, iridium and rhenium in marine sediments
@article{Colodner1992PostdepositionalMO, title={Post-depositional mobility of platinum, iridium and rhenium in marine sediments}, author={Debra C. Colodner and Edward A. Boyle and John M. Edmond and John P. Thomson}, journal={Nature}, year={1992}, volume={358}, pages={402-404} }
THE discovery of high concentrations of iridium in Cretaceous/Tertiary boundary sediments engendered the hypothesis1 that a meteorite collided with the Earth 65 million years ago, coincident with the mass extinction that occurred at that time. Iridium spikes of various magnitudes have subsequently been reported at more than 10 other extinction horizons2–11. It has been suggested, on the other hand, that geochemical processes might create or modify many of these spikes5, 11–4, but a critical…
149 Citations
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References
SHOWING 1-10 OF 27 REFERENCES
Some comparative marine chemistries of rhenium, gold, silver and molybdenum
- Environmental Science
- 1986
Iridium Anomaly in the Upper Devonian of the Canning Basin, Western Australia
- Environmental Science, GeologyScience
- 1984
A moderate iridium anomaly, about 20 times the local background, has been found in Upper Devonian rocks in the Canning Basin, which suggests a causal link with some form of meteoroid impact.
Metal precipitation in the Cretaceous-Tertiary boundary clay at Stevns Klint, Denmark
- Geology, Environmental Science
- 1985
Iridium abundance maxima in the Upper Cenomanian extinction interval
- Geology, Environmental Science
- 1988
Two iridium abundance peaks, both 0.11 ppb (whole-rock basis) over local background of 0.017 ppb, have been found in Middle Cretaceous marine rocks near Pueblo, Colorado. They occur just below the…
Extraterrestrial Cause for the Cretaceous-Tertiary Extinction
- GeologyScience
- 1980
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.
A Major Meteorite Impact on the Earth 65 Million Years Ago: Evidence from the Cretaceous-Tertiary Boundary Clay
- GeologyScience
- 1980
The major extinction of life on the earth at the end of the Cretaceous Period may be related to the meteorite impact, as the enriched noble metals in the clay are present in cosmic proportions, indicating that the impacting celestial body had not undergone gross chemical differentiation.
Stromatolitic iron oxides: Evidence that sea-level changes can cause sedimentary iridium anomalies
- Environmental Science, Geography
- 1991
In an attempt to understand the origin of an Ir-rich unit near the Late Devonian Frasnian-Famennian (F/F) boundary in the Canning basin of Western Australia, we have examined two lithologically…
ACRAMAN IMPACT EJECTA AND HOST SHALES - EVIDENCE FOR LOW-TEMPERATURE MOBILIZATION OF IRIDIUM AND OTHER PLATINOIDS
- Geology
- 1990
Geochemical investigations of a widely dispersed Late Proterozoic impact ejecta horizon and its host shales (Bunyeroo Formation, Australia) have provided strong evidence for low-temperature…
Iridium Anomaly Approximately Synchronous with Terminal Eocene Extinctions
- Geology, GeographyScience
- 1982
The iridium anomaly and the tektites and microtektites are supportive of a major bolide impact about 34 million years ago, and other workers have deduced that the microtekkites are part of the North American strewn tektite field, which is dated at about34 million years before present.