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Reactivated basement structures and their control on sandstone-hosted Pb-Zn deposit along the eastern front of the Scandinavian Caledonides

Presented at Uppsala (Sweden), 12-15 August 2013
PublisherSociety for Geology Applied to mineral deposits (SGA)
Publication date2013
Abstract

The Laisvall stratabound Pb-Zn deposit is hosted in Ediacaran-Cambrian sandstone along the eastern front of the Scandinavian Caledonides. Magnetic lineaments identified using airborne geophysical data correspond to geological features in the Palaeoproterozoic crystalline basement beneath this deposit. Geological modelling of the deposit in 3D space shows a correlation between some of the lineaments defined by magnetic minima and faults in the Ediacaran-Cambrian siliciclastic rocks, which are inferred to be spatially coupled to reactivated faults in the basement. Basement fault reactivation caused syn-sedimentary block faulting and also post-sedimentary and post-mineralisation fault movement. The reactivated faults define two major sets, which are inferred to have conditioned basin architecture and deposition of sediment during Ediacaran-Cambrian time, as N-S to NE-SW basin-parallel and WNW-ESE to NW-SE transfer faults. Lead and zinc grade modelling in 3D space revealed plume-like features that are spatially linked to NE-SW faults, suggesting these were conduits to the mineralizing fluids. These conduits and the location of the Laisvall ore bodies are spatially linked to inflection areas along magnetic minima. The geometry of the ore bodies is consistent with the presence of sour gas traps in the sandstone aquifers that may provide reduced sulphur for the formation of economic Pb-Zn deposits.

Keywords
  • Reactivated basement faults
  • Ediacaran to Cambrian
  • sandstone
  • Pb-Zn
Citation (ISO format)
SAINTILAN, Nicolas et al. Reactivated basement structures and their control on sandstone-hosted Pb-Zn deposit along the eastern front of the Scandinavian Caledonides. In: 12th Society for Geology Applied to mineral deposits Biennial Meeting 2013. Proceedings, Volume 4. Uppsala (Sweden). [s.l.] : Society for Geology Applied to mineral deposits (SGA), 2013. p. 1667–1670.
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  • PID : unige:29382
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