Other
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..31..345m&link_type=abstract
Earth and Planetary Science Letters, vol. 31, no. 3, Aug. 1976, p. 345-357. Research supported by the National Research Council
Other
11
Argon Isotopes, Geochronology, Meteorite Craters, Radioactive Age Determination, Anorthosite, Labrador, Lakes, Petrology, Tables (Data)
Scientific paper
Ar-40/Ar-39 age determinations have been carried out on eight samples of melt rocks and one of the maskelynite from Mistastin Lake impact crater, Labrador. The observed Ar-40 evolution spectra of the impact melts fall into distinct groups which correlate with petrographic variations. The release patterns of six of the melt rock samples define an age plateau in the range 34-41 million years; the other two have complex spectra which indicate incomplete equilibration of inclusions. Four of the samples with well defined plateaus exhibit a high-temperature sag in their Ar-40/Ar-39 ratio similar to that observed in some lunar samples. Maskelynite gives a partially overprinted spectrum which rises monotonically to a final age near 700 million years, approximately half the age of the country rocks. The data from the melt samples are interpreted as indicating an age of 38 plus or minus 4 million years for the Mistastin Lake impact event. Previously, it had been considered that this crater was 202 plus or minus 25 million years old.
Dence Michael R.
Grieve Richard A. F.
Mak E. K.
York Derek
No associations
LandOfFree
The age of the Mistastin Lake crater, Labrador, Canada does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The age of the Mistastin Lake crater, Labrador, Canada, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The age of the Mistastin Lake crater, Labrador, Canada will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1872626