Sodium metasomatism along the Melones fault zone, Sierra Nevada foothills, California, USA
Mineralogical Magazine
By: G.V. Albino
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Abstract
Albitite, locally aegirine- and riebeckite-bearing, formed as a result of sodium metasomatism of felsic dykes and argillites along the Melones Fault Zone near Jamestown, California. Pyrite, magnetite, hematite and titanite are common in small amounts in altered dykes. The dykes were originally plagioclase-hornblende porphyritic, and had major and trace element abundances typical of calc-alkaline rocks, whereas they now have Na2O contents as high as 11.40%. Mass balance calculations indicate that alteration involved addition of large amounts of sodium, and the removal of SiO2 and K2O. Textural preservation, combined with volume factors calculated from specific gravity and whole rock analytical data, indicate that Na-metasomatism was essentially isovolumetric. -from Author
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Sodium metasomatism along the Melones fault zone, Sierra Nevada foothills, California, USA |
| Series title | Mineralogical Magazine |
| Volume | 59 |
| Issue | 3 |
| Year Published | 1995 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Mineralogical Magazine |
| First page | 383 |
| Last page | 399 |
| Google Analytic Metrics | Metrics page |