Bloody Creek - Hypervelocity Impact Crater

Alternate Names Astrid Crater, per (Anonymous, 1995).
Coordinates 44° 45' 0" N; 65° 14' 33" W
Notes
  1. 15 km S of Bridgetown.
Country Canada
Region Nova Scotia
Date Confirmed 2009
Notes
  1. Confirmed by PDFs in quartz and feldspar; also grain comminution, polymict lithic microbreccias, kink-banded feldspar and biotite (Spooner et al., 2009).
Buried? Yes
Notes
  1. Underwater
Drilled? No
Target Type Crystalline
Notes
  1. South Mountain Batholith.
Sub-Type Igneous
Apparent Crater Diameter (km) 400 m
Age (Ma) 0.012 - 388
Notes :
  1. Age of target rocks indicates impact is less than 388 Ma years (Spooner et al., 2009). *Minimum age is poorly constrained and is estimated based on erosion but younger than deglaciation <12,000 yrs BP.

Method :
  1. Stratigraphy
Impactor Type Unknown

Advanced Data Fields

Notes

Local Language
N/A
Erosion
7
  1. No crater-fill preserved, heavily eroded. (Spooner et al., 2009). See also (Spooner et al., 2015).
Final Rim Diameter
Unknown
Apparent Rim Diameter
400 m
  1. (Spooner et al., 2009)
Rim Reliability Index
3
  1. (Spooner et al., 2009) describe a shallow, ~0.4km-wide, bowl-shaped structure.
Crater Morphology
Simple
Central Uplift Diameter
Unknown
Central Uplift Height
Unknown
Uplift Reliability Index
Unknown
Structural Uplift
Unknown
Thickness of Seds
Unknown
Target Age
Palaeozoic
Marine
No
Impactor Type
Unknown
Other Shock Metamorphism
Unknown
Shatter Cones
No
Planar Fractures
No
  1. Did not find in literature.
Planar Deformation Features
Yes
  1. Thin-section analysis of 20 samples collected proximal to and on the western rim crest ... document several features that are supportive of shock metamorphism ... including microbrecciation and cataclasis, kink-banding and rare planar microstructures (PMs) in feldspar, reduced mineral birefringence, common mosaicism and PMs in quartz, kink-banding in mica, and systematic degradation of biotite to chlorite showing plastic deformation and flow microtextures ... Of these features, single to multiple sets of thin, closely spaced PMs in feldspar and quartz—interpreted as shock-induced planar deformation features (PDFs)—are considered uniquely diagnostic of shock metamorphism (cf. Reimold 2007) (Spooner et al., 2009).
Diaplectic Glass
No
  1. Note that (Spooner et al., 2009) identify possiblity of traces of diaplectic glass in thin-section samples from rim of crater structure, based on presence of \"several\" isotropic feldspar grains.
Coesite
No
Stisovite
No
Crater Fill
Unknown
  1. \"Relatively shallow crater seems at odds to petrological evidence, according to (Spooner et al., 2009), who argue that the structure may have been significantly eroded by glacial activity. Crater filled by heterogenous sediments. See also: Evidence presented in (Spooner et al., 2015) for a second, similar crater several hundred metres to the north of the Bloody Creek crater. Determining any relation between the two is deemed to require more study.\"
Proximal Ejecta
Unknown
Distal Ejecta
Unknown
Dykes
Unknown
Volume of Melt
Unknown
Depth of Melting
Unknown

References

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I Spooner, G Stevens, J Morrow, P Pufahl, R Grieve, R Raeside, J Pilon, C Stanley, S Barr, D McMullin (2009) Identification of the Bloody Creek structure, a possible impact crater in southwestern Nova Scotia, Canada, Meteoritics and Planetary Science 44(8), p. 1193-1202, doi:10.1111/j.1945-5100.2009.tb01217.x

I Spooner, P Pufahl, T Brisco, J Morrow, M Nalepa, P Williams, G Stevens (2015) The North structure: evidence for a possible second impact near the Bloody Creek site, Nova Scotia, Canada, Atlantic Geology 51, p. 44-50, doi:https://doi.org/10.4138/atlgeol.2015.002