Formation of peridotites by deserpentinization in the Darrington and Sultan areas, Cascade Mountains, Washington

@inproceedings{Vance1977FormationOP,
  title={Formation of peridotites by deserpentinization in the Darrington and Sultan areas, Cascade Mountains, Washington},
  author={Joseph A. Vance and Michael A. Dungan},
  year={1977}
}
In the Darrington and Sultan basin areas of the Cascade Mountains, mafic and ultramafic rocks occur as sheets and lenses that were tectonically emplaced along high-angle faults. The ultramafic rocks comprise pseudomorphic serpentinite (lizardite-chrysotile), antigorite serpentinite, and metamorphic peridotite (olivine-talc-tremolite). The peridotites are of two types: (1) subordinate black-weathering peridotite characterized by iron-poor olivine (Fo 98 −Fo 94 ) and essential magnetite, and (2… CONTINUE READING

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