Mistastin crater
| Mistastin Lake | |
|---|---|
 Landsat Image | |
| Location | Labrador, Newfoundland and Labrador, Canada |
| Coordinates | 55°53′N 63°18′W / 55.883°N 63.300°WCoordinates: 55°53′N 63°18′W / 55.883°N 63.300°W |
| Type | impact crater lake |
| Basin countries | Canada |
| Max. length | 19 km (12 mi) |
| Max. width | 12 km (7.5 mi) |
| Surface area | 145 km2 (56 sq mi) |
| Surface elevation | 338 metres (1,109 ft) |
| Islands | Horseshoe Island |
Mistastin crater is a meteorite crater in Labrador, Canada which contains the roughly circular Mistastin Lake.[1]
The lake's arcuate central island is interpreted to be the central uplift of the complex crater structure. The target rocks were part of a batholith composed of adamellite, mangerite and lenses of anorthosite. There are abundant shock metamorphic features exhibited in the rocks of the island. Planar deformation features, diaplectic glass, melt rocks, and shatter cones have been identified.
The lake is approximately 16 km (9.9 mi) in diameter, while the estimated diameter of the original crater is 28 km (17 mi). The age of the crater is estimated to be 36.4 ± 4 million years (Eocene).
References
- ↑ "Mistastin". Earth Impact Database. University of New Brunswick. Retrieved 2007-01-13.
Further reading
- Currie, K.L. (1968) "Mistastin Lake, Labrador: A new Canadian crater". Nature, v. 220, pp. 776–777.
- Currie, K.L. Larochelle, A. (1969) "A paleomagnetic study of volcanic rocks from Mistastin Lake, Labrador, Canada". Earth and Planetary Science Letters, v. 6, pp. 309–315.
- Currie, K.L. (1971) "Geology of the resurgent cryptoexplosion crater at Mistastin Lake, Labrador". Geological Survey of Canada Bulletin 207, 62 p.
- Currie, K.L. (1971) "The composition of anomalous plagioclase glass and coexisting plagioclase from Mistastin Lake, Labrador, Canada". Mineralogical Magazine, v. 38, pp. 511–517.
- Grieve, R.A.F. (1975) "Petrology and chemistry of the impact melt at Mistastin Lake crater, Labrador". Geological Society of America Bulletin 86, pp. 1617–1629.
- Mak, E.K.C. York, D., Grieve, R.A.F. and Dence, M.R. (1976) "The age of the Mistastin Lake crater, Labrador, Canada". Earth and Planetary Science Letters, v. 31, pp. 345–357.
- Marchand, M. Crocket, J.H. (1977) "Sr isotopes and trace element geochemistry of the impact melt and target rocks at the Mistastin Lake crater, Labrador". Geochimica et Cosmochimica Acta, v. 41, pp. 1487–1495.
External links
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