| 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 |
| Genre: | Article |
| ProdID: | 70018883 |
| Citation Author: | Albino, G. V. |
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| Citation End Page: | 399 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Mineralogical Magazine |
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| Citation Number Of Pages: | 17 |
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| Citation Search Results Text: | Sodium metasomatism along the Melones fault zone, Sierra Nevada foothills, California, USA; 1995; Article; Journal; Mineralogical Magazine; Albino, G. V. |
| Citation Start Page: | 383 |
| Citation Volume: | 59 |
| Citation Year: | 1995 |
| Type: | citation/reference |
| Text: | Sodium metasomatism along the Melones fault zone, Sierra Nevada foothills, California, USA; 1995; Article; Journal; Mineralogical Magazine; Albino, G. V. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1995 00:00 -0600 |
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