| Abstract: | Variscan granites of the Erzgebirge region can be effectively classified into five genetically distinct major groups by canonical analysis of geochemical variables. The same classification procedure, when applied to small plutons in the Aue-Schwarzenberg granite zone (ASGZ), shows that all ASGZ granites have compositional affinities to low-F biotite or low-F two-mica granite groups. This suggests that the ASGZ granites were emplaced during the first, late-collisional stage of silicic magmatism in the region, which occurred between about 325 and 318 Ma. The numerous biotite granite bodies in the zone are geochemically distinct from both the neighboring Kirchberg granite pluton and the spatially displaced Niederbobritzsch biotite granite massif. Instead, these bodies seem to constitute a third sub-group within the low-F biotite granite class. The ASGZ biotite granites represent three or more genetically distinct bodies, thus highlighting the enormous compositional variability within this group of granites. Least evolved samples of two-mica granites from the ASGZ apparently reflect the assimilation of low-grade metamorphic country rocks during emplacement, altering the original composition of the melts by enhancing primary Al content. The same genesis is implied for the rare "cordierite granite" facies of the Bergen massif, the type pluton for the low-F two-mica granite group in the Erzgebirge. |
| Genre: | Article |
| ProdID: | 70022415 |
| Citation Author: | Forster, H. -J.; Davis, J. C. |
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| Citation End Page: | 542 |
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| Citation Language: | English |
| Citation Larger Work Title: | Neues Jahrbuch fur Mineralogie, Monatshefte |
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| Citation Number Of Pages: | 14 |
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| Citation Search Results Text: | Determination of geochemical affinities of granitic rocks from the Aue-Schwarzenberg zone (Erzgebirge, Germany) by multivariate statistics; 2000; Article; Journal; Neues Jahrbuch fur Mineralogie, Monatshefte; Forster, H. -J.; Davis, J. C. |
| Citation Start Page: | 529 |
| Citation Volume: | 12 |
| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Determination of geochemical affinities of granitic rocks from the Aue-Schwarzenberg zone (Erzgebirge, Germany) by multivariate statistics; 2000; Article; Journal; Neues Jahrbuch fur Mineralogie, Monatshefte; Forster, H. -J.; Davis, J. C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 2000 00:00 -0600 |
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