Rhyolitic Tuff Flows in Southern Peru

@article{Jenks1956RhyoliticTF,
  title={Rhyolitic Tuff Flows in Southern Peru},
  author={W. F. Jenks and S. S. Goldich},
  journal={The Journal of Geology},
  year={1956},
  volume={64},
  pages={156 - 172}
}
The numerous and widespread sillar deposits in the western Andes of southern Peru are rhyolitic tuff flows which are not welded. Two types may be easily distinguished by color in the field. One, a salmon-colored sillar, is composed largely of minute glass shards and pumice fragments and contains small amounts of oligoclase and biotite and, rarely, quartz. The other, a white sillar, is relatively free of hematite colorant, is hard, and consists largely of secondary axiolitic and spherulitic… Expand
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References

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