Deep Bay - Hypervelocity Impact Crater

Alternate Names
Local Language
Coordinates 56° 24' 11" N; 102° 59' 28" W
Notes
  1. Southern end of Reindeer Lake in northern Saskatchewan. It is 400 km N of Prince Albert and 100 km NW of Flin Flon, Manitoba.
Country Canada
Region Saskatchewan
Date Confirmed 1968
Notes
  1. Impact origin supported by the "intense fracturing and shattering of the granitic rocks" (Innes et al., 1964). Confirmed by PDFs in quartz in drill cores (Dence et al., 1968).
Buried? Yes
Notes
  1. Partially filled by ~300 m of Mesozoic sedimentsand is now covered by water (Innes et al., 1964).
Drilled? Yes
Notes
  1. 4 holes drilled. Drill hole 62-1A penetrates shocked and fractured gneisses of central uplift and extends to depth of 433 m. Allogenic breccia was found to flank centrally uplifted rocks (Innes et al., 1964) (Dence et al., 1968).
Target Type Crystalline
Notes
  1. Proterozoic pelitic gneiss, minor granite, migmatite (Innes et al., 1964).
Sub-Type Gneiss, Migmatite, Granite
Apparent Crater Diameter (km) 13 km
Age (Ma) 95 - 102
Notes :
  1. 95-102 Ma estimated from stratigraphic constraints by (Grieve, 2006). Previous work on undisturbed Mesozoic strata near the centre of the bay, along with fossil evidence, have been used to estimate the age to be 100 ± 50 Ma (Innes et al., 1964) (Grieve and Robertson, 1979).

Method :
  1. Stratigraphy
Impactor Type Unknown

Advanced Data Fields

Notes

Erosion
5
  1. Glaciation has removed ejecta, rim crest and some crater-fill products (Innes et al., 1964).
Final Rim Diameter
Unknown
Apparent Rim Diameter
13 km
  1. Some of dimensions are based on geophysics (Ogilvie et al., 1984). Original crater diameter of 905 km (Dence et al., 1968).
Rim Reliability Index
3
  1. Composed of a circular lake containing a submerged central uplift and a circular shoreline of 11 km of hummocky hills and discontinuous ridges (Innes et al., 1964).
Crater Morphology
Complex
Central Uplift Diameter
km
Central Uplift Height
100 m
Uplift Reliability Index
3
Structural Uplift
Unknown
Thickness of Seds
Target Age
Precambrian
Marine
No
Impactor Type
Other Shock Metamorphism
No
Shatter Cones
No
  1. No shatter cones reported.
Planar Fractures
No
  1. Did not find in literature.
Planar Deformation Features
Yes
  1. PDF in quartz grains and feldspar (Dence et al., 1968) (Grieve, 2006). Planar features in quartz, mainly Type B (in the classification of) (Robertson et al., 1968) is seen in the top section of fractured, or brecciated shocked garnet-biotite-quartz-feldspar gneiss from drill logs DDH 65-1 and DDF 62-1A (Dence et al., 1968). Below ~1530 feet in hole DDH 65-1, quartz planar features are dominantly type A (Dence et al., 1968).
Diaplectic Glass
No
  1. Did not find in literature.
Coesite
No
  1. Did not find in literature.
Stisovite
No
  1. Did not find in literature.
Crater Fill
LB, MB
  1. Allochthonous breccia was found to flank centrally uplifted rocks (Innes et al., 1964) (Dence et al., 1968). Couldn't access the references.
Proximal Ejecta
Distal Ejecta
Dykes
Volume of Melt
Depth of Melting

References

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M J S Innes (1959) A gravity investigation of the Deep Bay crater (Saskatchewan), Minutes of the Proceedings of the Royal Society of Canada, 1969- 53, p. 20, Royal Society of Canada, Ottawa, ON, url

B Dent (1972) Three Dimensional Gravity Model of the Deep Bay, Saskatchewan Impact Crater, Eos, Transactions, American Geophysical Union 53(11), p. 1036, American Geophysical Union, Washington, DC, url