Jadeite deposits of the clear creek area, New Idria district, San Benito county, California
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Abstract
Tectonic inclusions within the New Idria serpentine body contain jadeite in two distinct assemblages: (1) Lenslike inclusions containing a monomineralic green jadeite core surrounded by a calc-silicate rim. (2) Jadeite veins cross-cutting albite-crossite schist inclusions. In these veins jadeite coexists with low albite; green jadeite (Jd 75 Ac+Di+He 25) coexists with low albite within the host schist.
Albite schists are related to the pre-metamorphic keratophyres and it can be shown that desilication of such rocks produces a bulk composition similar to that of jadeite. Metamor-phism of keratophyric tectonic inclusions within serpentine produced jadeite-albite schists along margins of the inclusions. Jadeite-albite veins formed from mobilized liquids rich in the jadeite molecule and deficient in water. Geological evidence such as would indicate extreme pressures or temperatures during jadeite formation is lacking; rather, a low silica and dry system allowed its formation at reduced temperatures and pressures.
Suggested Citation
Coleman, R.G., 1961, Jadeite deposits of the clear creek area, New Idria district, San Benito county, California: Journal of Petrology, v. 2, no. 2, p. 209-247, https://doi.org/10.1093/petrology/2.2.209.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Jadeite deposits of the clear creek area, New Idria district, San Benito county, California |
| Series title | Journal of Petrology |
| DOI | 10.1093/petrology/2.2.209 |
| Volume | 2 |
| Issue | 2 |
| Year Published | 1961 |
| Language | English |
| Publisher | Oxford University Press |
| Description | 39 p. |
| First page | 209 |
| Last page | 247 |
| Country | United States |
| State | California |
| Other Geospatial | Monterey Bay |