Chilling and Brecciation of a Devonian Rhyolite Sill Intruded into Wet Sediments, Northern Sierra Nevada, California

  title={Chilling and Brecciation of a Devonian Rhyolite Sill Intruded into Wet Sediments, Northern Sierra Nevada, California},
  author={Richard E. Hanson and Richard A. Schweickert},
  journal={The Journal of Geology},
  pages={717 - 724}
Localized pockets of peperite breccia occur near the base of a well-exposed hypabyssal rhyolite sill within the Upper Devonian volcanic sequence of the northern Sierra Nevada. The peperites resulted from chilling, fragmentation, and commingling of rhyolite with wet, poorly consolidated sediment. Zones of hyaloclastite breccia extend into the sill above the peperites and represent areas where chilled rhyolite underwent fragmentation but was not intermixed with sediment. A dense spherulitic… 

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  • B. Kokelaar
  • Geology
    Journal of the Geological Society
  • 1982
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