| Previous record: 23 | Next record: 25 |
Minor podiform chromite deposit, 5 of 6 in Stanislaus county (in California)
Sections of this page: [Geologic] - [Economic] - [Reference]
| Country | United States |
|---|---|
| State or province | California |
| Geographic location: | 37°24'6"N,
121°25'11"W (-121.419722, 37.401667) |
| Geographic context: | (click for info) |
| Deposit type | minor podiform chromite |
| Model type | Banded Podiform |
| Deposit form | lenses, pods |
| Deposit texture | granular, massive |
| Ore type | Metallurgical |
| Age of deposit | Middle Jurassic (161.13±0.11, 161.167±0.093 Ma, CA-TIMS, zircon in plagiogranite) |
| Age (m.y.) | 161million years |
| Area of deposit | 912sq m |
| Ore body length | 152m |
| Ore body width | 6m |
| Mineralogy | chromite |
| Host rock type | dunite |
| Host rock length | 15200 |
| Host rock width | 3000 |
| Paleotectonic setting | suprasubduction |
| Ophiolite zone | transition |
| Deposits < 10km | podiform chromite, Franciscan Mn, silica-carbonate magnesite, silica-carbonate Hg |
| Rocks within 5km | wehrlite harzburgite websterite pyroxenite dunite gabbro sandstone shale chert graywacke siltstone conglomerate limestone glaucophane schist keratophyre quartz keratophyre mafic metavolcanic rocks |
| Geologic map unit | -121.419722222222, 37.4016666666667 |
| Nearby scientific data | Find additional scientific data near this location |
| Discovery date | <1918 | |
|---|---|---|
| Startup date | 1918 | |
| Tonnage | 0.000152 | million metric tons |
| Ore depth | 0 | m |
| Cr2O3 grade | 42 | percent |
| Rh grade | 0.019 | g/t |
| Ir grade | 0.73 | g/t |
| Ru grade | 0.51 | g/t |
| Pd grade | 0.013 | g/t |
| Pt grade | 0.061 | g/t |
| Comments | Stanislaus County. |
|---|---|
| References | Evarts, R.C., Coleman, R.G., and Schiffman, P., 1999, The Del Puerto Ophiolite--Petrology and tectonic setting, in Wagner, D.L., and Graham, S.A., eds., Geologic field trips in northern California, Centennial Meeting of the Cordilleran Section of the Geological Society of America: California Division of Mines and Geology Special Publication 119, p. 136-149. Rogers, T.H., 1966, Geologic map of California, San Jose sheet: California Division of Mines and Geology, scale 1:250,000. Choi, S.H., Shervais, J.W., and Mukasa, S.B., 2008, Supra-subduction and abyssal mantle peridotites of the Coast Range ophiolite, California: Contributions to Mineralogy and Petrology, v. 156, p. 551-576. Walker, G.W., and Griggs, A.B., 1953, Chromite deposits of the southern Coast Ranges of California, in Geological investigations of chromite in California, Part 2--Coast Ranges: California Division of Mines Bulletin 134, pt. 2, ch. 2, 88 p. Carlson, C.A., Wilson, S.A., Carlson, R.R., Bradley, L., Cornell, J., Gent, C., Gass, W., Groeneboer, H., Haffty, J., Haubert, A., Love, A., McDade, J.M., Moore, R., Riley, L., Moring, B.C., Singer, D.A., and Page, N. J, 1985, Analyses for platinum group elements in samples from podiform chromite deposits, California and Oregon: U.S. Geological Survey Open-File Report 85-442, 15 p. Hopson, C.A., Mattinson, J.M., Pessagno, E.A., Jr., and Luyendyk, B.P., 2008, California Coast Range ophiolite--Composite Middle and Late Jurassic oceanic lithosphere: Geological Society of America Special Paper 438, p. 1-101. |