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Minor podiform chromite deposit, 16 of 22 in Butte county (in California)
Sections of this page: [Geologic] - [Economic] - [Reference]
| Other names | The Gray Boy |
|---|---|
| Country | United States |
| State or province | California |
| Geographic location: | 39°41'55"N,
121°34'1"W (-121.566944, 39.698611) |
| Geographic context: | (click for info) |
| Deposit type | minor podiform chromite |
| Model type | Minor Podiform |
| Deposit texture | disseminated |
| Ore type | Unknown |
| Age of deposit | Upper Triassic-Lower Jurassic or older (204±2 Ma U-Pb zircon on leucodiorite) |
| Age (m.y.) | 204million years |
| Mineralogy | chromite |
| Host rock type | serpentine |
| Paleotectonic setting | suprasubduction |
| Ophiolite zone | tectonite |
| Deposits < 10km | podiform chromite |
| Rocks within 5km | serpentine harzburgite phyllite slate quartzite graywacke metabasalt metadacite metarhyolite basalt andesite andesite tuff breccia andesite mudflow andesite tuff andesite breccia granite granodiorite monzonite diorite alluvium |
| Geologic map unit | -121.566944444444, 39.6986111111111 |
| Nearby scientific data | Find additional scientific data near this location |
| Discovery date | 1917 | |
|---|---|---|
| Startup date | 1918 | |
| Tonnage | 0.0003 | million metric tons |
| Ore depth | 0 | m |
| Cr2O3 grade | 11 | percent |
| Comments | Fiddle Creek Complex between Western and Central belts. Butte County. |
|---|---|
| References | Burnett, J.L., and Jennings, C.W., 1962, Geologic map of California, Chico sheet: California Division of Mines and Geology, scale 1:250,000. Rynearson, G.A., 1951, Chromite deposits in the northern Sierra Nevada, California (Placer, Nevada, Sierra, Yuba, Butte, and Plumas counties), in Geological investigations of chromite in California, Part 3--Sierra Nevada: California Division of Mines Bulletin 134, pt. 3, ch. 5, 321 p. Saleeby, J.B., Shaw, H.F., Niemeyer, S., Moores, E.M., and Edelman, S.H., 1989, U/Pb, Sm/Nd, and Rb/Sr geochronological and isotopic study of northern Sierra Nevada ophiolitic assemblages, California: Contributions to Mineralogy and Petrology, v. 102, p. 205-220. |