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.
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 |
| Google Analytic Metrics | Metrics page |