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Sodium metasomatism along the Melones fault zone, Sierra Nevada foothills, California, USA

Mineralogical Magazine

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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

Additional Publication Details

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
Number of Pages:
17