GRAVITAS

Geological Research and Analysis of Vredefort Impact with Timely Anthropological Studies

GRAVITASWEBb

GRAVITAS is an international multidisciplinary collaboration aimed to develop scienti­fic research, education, and public communication of planetary science from South Africa.
 
GRAVITAS aims to better understand impact melt dykes of the Vredefort Impact Structure, South Africa. The Vredefort Impact Structure is one of the largest and oldest meteorite craters on Earth, and learning about impact processes allows us to better constrain how our planet and life developed.
 
The impact melt dykes were created through melting of the meteorite and the Earth’s impacted crust, which injected into cracks in the crater floor. The impact melt allows us to understand large-scale impact processes, composition of the meteorite, age of the impact, and long term post-impact processes in the crust.
 
Impact melt rocks are exposed at surface as long semi-continuous lines of boulders. These rocks were used by African ­first-people as cultural gathering sites and preserve rock art. Studying these sites will expand the body of anthropological knowledge of ­first peoples.

Conference Proceedings

  • Kovaleva E., Huber M.S., Clark M., Fourie F., 2019. Timing of emplacement of Vredefort granophyre dykes. Large Meteorite Impacts and Planetary Evolution VI, LPI Contrib. No. 2136, 5080. Link: https://www.hou.usra.edu/meetings/lmi2019/pdf/5080.pdf

  • Kovaleva E., Zamyatin D., Leroux H., 2019. Twisted kink bands: New shock deformation microstructure in zircon from the Vredefort impact structure. Large Meteorite Impacts and Planetary Evolution VI, LPI Contrib. No. 2136, 5056.

Peer-reviewed papers

  • Kovaleva E., Zamyatin D., Habler G., 2019. Granular zircon from Vredefort granophyre (South Africa) confirms the deep injection model for impact melt in large impact structures. Geology, 47, 691-694, DOI: https://doi.org/10.1130/G46040.1

  • Fourie F., Huber M.S., Kovaleva E., 2019. Geophysical characterization of the Daskop Granophyre Dyke and surrounding host rocks, Vredefort impact structure, South Africa. Meteoritics & Planetary Science, 54, 1579-1593, DOI: https://doi.org/10.1111/maps.13300

  • Huber M.S., Kovaleva E., Riller U., submitted to Meteoritics & Planetary Science. Geochemical modelling of the Vredefort granophyre dikes and Sudbury Offset Dykes.

  • Huber M.S., Kovaleva E., Clark M., Fourie F., Riller U., submitted to Geology. Post-impact isostatic re-equilibration of crust following the Vredefort impact event controlled the emplacement of impact melt dykes. 

Primary Collaborators

Extended Collaborators

Gravitas Descriptor  Contact

Vredefort Topology Map

Vredefort Topography Map

Rainsnake

The Rainsnake

Activities

  • Field trips: June 19-22, 2019. Aerial Photography, Geophysics, Geological Mapping

  • August 6-9, 2019. Aerial Photography, Geophysics

  • Elizaveta Kovaleva has participated in the Large Meteorite Impacts and Planetary Evolution (LMI VI) conference in Brasilia, Brazil from September 30th to October 3rd 2019. She presented a poster “Timing of emplacement of the Vredefort granophyre dykes”, and a talk and a poster titled: “TWISTED KINK BANDS: A new shock deformation microstructure in zircon, Vredefort impact structure”.

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  • Gravitas Descriptor
  • P2130360
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  • P2130358
  • P2130359
  • P2120010
  • P2130117
  • P2130186
  • Granophyre_1
  • P2120012
  • 100_8924
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