Sm-Nd systematics of a tonalitic augen gneiss and its constituent minerals from northern Michigan
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Abstract
The Sm-Nd isotopic system of a tonalitic augen gneiss and its constituent minerals from northern Michigan was disturbed during metamorphism. Sm-Nd zircon ages are lower than the wholerock Sm-Nd model age. However, closely associated pairs of minerals (for example, sphene and biotite or apatite and plagioclase) retain their apparent metamorphic ages. The Sm-Nd model age for the tonalitic augen gneiss of 3919 ± 30myr, appears to reflect open system behavior during metamorphism. A mineralogically different gneiss from the same location has a Sm-Nd model age of 3520 ± 70 myr. The two whole rocks differ in their Sm-Nd and Rb-Sr systematics and in their chondrite-normalized rare earth element (REE) patterns. The whole-rock-normalized mineral REE patterns show the contribution of the major and trace minerals to the REE content of the whole rock. The trace minerals contain a significant amount of the total REE.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Sm-Nd systematics of a tonalitic augen gneiss and its constituent minerals from northern Michigan |
| Series title | Geochimica et Cosmochimica Acta |
| DOI | 10.1016/0016-7037(81)90148-4 |
| Volume | 45 |
| Issue | 7 |
| Year Published | 1981 |
| Language | English |
| Publisher | Elsevier |
| Description | 5 p. |
| First page | 1245 |
| Last page | 1249 |
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