| Abstract: | Granitic-rhyolitic liquids were produced experimentally from moderately hydrous (1.7-2.3 wt% H2O) medium-to-high K basaltic compositions at 700 MPa and f O2 controlled from Ni-NiO -1.3 to +4. Amount and composition of evolved liquids and coexisting mineral assemblages vary with fO2 and temperature, with melt being more evolved at higher fO2s, where coexisting mineral assemblages are more plagioclase- and Fe-Ti oxide-rich and amphibole-poor. At fO2 of Ni-NiO +1, typical for many silicic magmas, the samples produce 12-25 wt% granitic-rhyolitic liquid, amounts varying with bulk composition. Medium-to-high K basalts are common in subduction-related magmatic arcs, and near-solidus true granite or rhyolite liquids can form widely, and in geologically significant quantities, by advanced crystallization-differentiation or by low-degree partial remelting of mantle-derived basaltic sources. Previously differentiated or weathered materials may be involved in generating specific felsic magmas, but are not required for such magmas to be voluminous or to have the K-rich granitic compositions typical of the upper continental crust. ?? Springer-Verlag 2005. |
| Genre: | Article |
| ProdID: | 70029352 |
| Citation Author: | Sisson, T. W.; Ratajeski, K.; Hankins, W. B.; Glazner, A. F. |
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| Citation End Page: | 661 |
| Citation Issue: | 6 |
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| Citation Language: | English |
| Citation Larger Work Title: | Contributions to Mineralogy and Petrology |
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| Citation Number Of Pages: | 27 |
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| Citation Search Results Text: | Voluminous granitic magmas from common basaltic sources; 2005; Article; Journal; Contributions to Mineralogy and Petrology; Sisson, T. W.; Ratajeski, K.; Hankins, W. B.; Glazner, A. F. |
| Citation Start Page: | 635 |
| Citation Volume: | 148 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Voluminous granitic magmas from common basaltic sources; 2005; Article; Journal; Contributions to Mineralogy and Petrology; Sisson, T. W.; Ratajeski, K.; Hankins, W. B.; Glazner, A. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1007/s00410-004-0632-9 |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
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