Global InformationFidalgo ophiolite information
| Fidalgo Complex | |
|---|---|
| Stratigraphic range: Jurassic | |
| Type | primarily igneous, but also volcanic and sedimentary; variably metamorphosed at low grade |
| Unit of | Northwest Cascades Thrust System; Haystack nappe |
| Overlies | Easton nappe |
| Lithology | |
| Primary | peridotite (incl. serpentinite), gabbro, diorite, plagiogranite, keratophyre, spilite |
| Other | greywacke, argillite, chert |
| Location | |
| Region | San Juan Islands, northwest Washington |
| Country | United States |
| Type section | |
| Named for | Fidalgo Island, Washington |
| Named by | Edwin (Ned) Brown.[1] |
The Fidalgo ophiolite or Fidalgo complex is a Jurassic-aged ophiolite sequence located in the San Juan Islands of northwest Washington.[2] The ophiolite complex is a metamorphosed and disrupted ophiolite sequence that contains serpentinized peridotite, layered gabbro, diorite, and plagiogranite, and an overlying sequence of volcanic and sedimentary rocks.[1]
- ^ a b Brown, E.H., 1977, Ophiolite on Fidalgo Island, Washington: in Coleman, R.G., and Irwin, W.P., eds., North American ophiolites: Oregon Department of Geology and Mineral Industries Bulletin 95, p. 67-74.
- ^ Whetten, J.T., Zartman, R.E., Blakely, R.J., and Jones, D.L., 1980, Allochthonous Jurassic ophiolite in northwest Washington: Geological Society of America Bulletin, v. 91, p. 359–368.