Haffield Breccia Project

This project is being managed by PhD student and member, Thomas Jones, mentored by our President, Dr Paul Olver and is planned for early 2016.    

Possible sites to study (these are the sites listed by the EHT):

  • Haffield house (Type locality)
  • Berrow hill
  • Woodbury Hill
  • Ankerdine Hill
  • Abberly Hill
  • Stagborough
  • Church Hills
  • Sling gravel pit
  • Kempsey bore hole (for pre-cam shallow volcanics)

For the Haffield Breccia sites deposits should be characterized for:

  • Total grain size distribution. Course to be done by sieving, fines to be analysed by laser diffraction (Tom).
  • Then, for each grainsize fraction:
    • Clast componentry
    • Clast morphology
      • Axis measurement for sphericity etc. parameters
      • Photographs of clasts for roundness image analysis
    • Also mapped in terms of extent and unit thickness
    • Stratigraphic logs of sampling regions and identification of facies at sites

For each clast type thin sections should be taken for a full petrographic description. The level of detail that is required here will become evident here as the project evolves. But at a basic, minimum level minerals and alteration can be identifies and compared to the source rocks. Clast densities will also need to be measured for flow calculations.

Anticipated outcomes:

  • Reconstruct paleo river/flood characteristics, comparing between locations.
  • Mathematical quantification of Haffield debris flows. (E.g. what was the flow velocity and yield strength)
  • Relative age and transportation distances of different clast types. Also proportions of material in the source region for these debris flows.
  • Correlation to ‘shallow’ Malvern volcanics through a comparison to material from the Kempsey bore hole logs.

Proposed Meetings:

  • Trip to Haffield house and Bromsberrow
  • Sample and stratigraphy log
  • Talk and lab work in village hall