S5 - Impact Deposit

Alternate Names S5 (Barberton)
Local Language
Coordinates 40° 45' 36" S; 73° 58' 48" E
Notes
  1. Note the Lat and Long provided are forthe type locality which occurs in the northern BGB at the base of the Belvue Road Formation of the Fig Tree Group. Only two localities are known for this layer (Lowe et al., 2014)
Country South Africa

Related Countries :
  1. South Africa
Region Barberton
Date Confirmed 2010
Notes
  1. Lowe and Byerly, 2010 (petrography); Lowe and Byerly, 2015 (sedimentology and brecciation)
Age (Ma) 3234 ± 5 Ma (Lowe et al., 2014)
Notes :
  1. Glass and Simonson 2012; Krull Davatzes et al., 2015; Lowe et al., 2014

Method :
  1. radiometric ages on zircons from tuffs (Lowe et al., 2014)
Impactor Type N/A
Notes
  1. Based on thickness (Lowe et al., 2014), all BGB spherule beds would have a larger bolide than the K-Pg impact event (which was about 10 km). Some results suggest bolides that are 20-50 km across (Byerly and Lowe, 1994; Lowe et al., 2003; Kyte et al., 2003) or 30-70 km across (Johnson and Melosh, 2012).
  2. Based on thickness (Lowe et al., 2014), all BGB spherule beds would have a larger bolide than the K-Pg impact event (which was about 10 km). Some results suggest bolides that are 20-50 km across (Byerly and Lowe, 1994; Lowe et al., 2003; Kyte et al., 2003) or 30-70 km across (Johnson and Melosh, 2012).

Advanced Data Fields

Notes

Spherules
X (4 compositional types)
Tektites
Indivudual Glass Clasts
N/A
Source Crater
Unknown
Geology
In the Fig Tree Group in the Barberton Greenstone Belt; spherules are largely microcrystalline quartz and phyllosilicate minerals; mxed with felsic volcaniclastic debris (Lowe et al., 2014)
  1. altered spherules; Lowe et al., 2014
Other Shock Metamorphism
N/A
Shatter Cones
No
Planar Fractures
No
Planar Deformation Features
No
Diaplectic Glass
No
Coesite
No
Stisovite
No