Clearwater East - Hypervelocity Impact Crater

Alternate Names East Clearwater
Local Language
Coordinates 56° 3' 37" N; 74° 7' 10" W
Notes
  1. 112 km E of Hudson Bay and 200 km NE of Poste-de-la-Baleine in northern Quebec.
Country Canada
Region Quebec
Date Confirmed 1965
Buried? No
Notes
  1. Under lake.
Drilled? Yes
Notes
  1. DDH 1-64 and 1-63 penetrated sedimentary filling complex and allogenic breccia at 2 km and 3 km from the centre, respectively (Dence, 1968) (Palme et al., 1979).
Target Type Crystalline
Notes
  1. Archean granodiorite, quartz monzonites, and granitic gneisses (Ogilvie et al., 1984).
Sub-Type Gneiss, Granodiorite, Monzonite
Apparent Crater Diameter (km) 26 km
Age (Ma) 460 - 470
Notes :
  1. 460-470 Ma estimated from 40Ar/39Ar of 4 samples of melt rock; determined after age spectra corrected for the trapped argon component and using inverse isochron plots (Schmeider et al., 2015). Additional age constraints: Values are in agreement with Bottomley et al. (1990); in conflict with Rb-Sr age of 290 ± 20 Ma (Reimold et al., 1981).

Method :
  1. 40Ar/39Ar
Impactor Type Chondrite
Notes
  1. The impact melt contains high concentrations of Ir and Os; 5 to 10% C1-chondrite abundances (Grieve et al., 1980).

Advanced Data Fields

Notes

Erosion
6
  1. Rim is eroded is completely; portions of the crater-fill products are preserved (Ogilvie et al., 1984).
Final Rim Diameter
Unknown
Apparent Rim Diameter
26 km
  1. Dimensions based on digital terrain model (Hische, 1994).
Rim Reliability Index
2
  1. The central uplift at East Clearwater are fully submerged under water (Schmieder et al., 2015). A highly eroded roughly circular depression is filled with water; central peak is submerged (Ogilvie et al., 1984).
Crater Morphology
Complex
Central Uplift Diameter
5km
Central Uplift Height
Unknown
Uplift Reliability Index
3
Structural Uplift
Unknown
Thickness of Seds
Target Age
Precambrian
Marine
No
Impactor Type
Chondrite
  1. The impact melt contains high concentrations of Ir and Os; 5 to 10% C1-chondrite abundances (Grieve et al., 1980).
Other Shock Metamorphism
Planar features
  1. All samples have characteristic shock-induced planar features in quartz, indicative of shock pressure in the range 12 15 GPa (Reimold et al., 1981).
Shatter Cones
No
  1. No shatter cones (Beals and Halliday, 1965).
Planar Fractures
No
Planar Deformation Features
Yes
  1. PDF in quartz (Dence, 1968) (Ogilvie et al., 1984). Gneiss from the central uplift contain quartz with PDFs (Grieve, 2006).
Diaplectic Glass
Yes
  1. Partial conversion of plagioclase to maskelynite (Reimold et al., 1981). (see Figs. 2 and 3) (Simonds et al., 1978).
Coesite
No
Stisovite
No
Crater Fill
MB, M
Proximal Ejecta
Distal Ejecta
Dykes
Volume of Melt
Depth of Melting

References

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T E Krogh, S L Kamo, B F Bohor (1996) Shock metamorphosed zircons with correlated U-Pb discordance and melt rocks with concordant protolith ages indicate an impact origin for the Sudbury Structure, Geophysical Monograph 95, p. 343-353, American Geophysical Union, Washington, DC, url, doi:http://dx.doi.org/10.1029/GM095p0343

D Habib, R K Olsson, C Liu, S Moskovitz (1996) High-resolution biostratigraphy of sea-level low, biotic extinction, and chaotic sedimentation at the Cretaceous-Tertiary boundary in Alabama, north of the Chicxulub Crater, Special Paper - Geological Society of America 307, Graham Ryder, David Fastovsky, Stefan Gartner (ed.), p. 243-252, Geological Society of America (GSA), Boulder, CO, url

A Ocampo, K Pope, A G Fischer, J Morrison, F Fischer, W Alvarez, D King, M R Rampino, C Webster (1996) Belize K/T boundary deposits; relation to Chicxulub impact, Abstracts with Programs - Geological Society of America 28(7), p. 182, Geological Society of America (GSA), Boulder, CO, url

J G Lopez-Oliva, W Stinnesbeck, G Keller, C D Reuther (1996) El limite Cretacico-Terciario en el Noreste de Mexico; aspectos bioestratigrafico-paleontologicos, Terra Nostra (Bonn) 8-96, p. 88, Alfred-Wegener-Stiftung, Bonn, url

P Claeys, W Alv