| Abstract: | Regionally extensive two-pyroxene granulite facies orthogneisses of Early Cretaceous age in Fiordland, southwest New Zealand, are criss-crossed by garnet-bearing feldspathic veins (and dikes) having associated marginal reaction zones of garnet granulite. The two-pyroxene granulites resulted from fluid-absent metamorphism of a suite of synkinematic primary anhydrous intrusions. Subsequent restricted formation of garnet granulite in feldspathic compositions, and locally eclogite in ultramafic compositions, proceeded chiefly via reactions involving hornblende breakdown, and occurred in response to sharply increased load pressure and local lowering of water activity. Fluid infiltration occurred at or near peak metamorphic pressure (~12 kbar at 650-700??C). Granulite metamorphism was of short duration (<20 m.y.) and accompanied tectonic thickening in a subduction-related magmatic arc. -from Author |
| Genre: | Article |
| ProdID: | 70015319 |
| Citation Author: | Bradshaw, J. Y. |
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| Citation End Page: | 717 |
| Citation Issue: | 16 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Geology |
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| Citation Number Of Pages: | 21 |
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| Citation Search Results Text: | Early Cretaceous vein-related garnet granulite in Fiordland, southwest New Zealand: a case for infiltration of mantle-derived CO2-rich fluids; 1989; Article; Journal; Journal of Geology; Bradshaw, J. Y. |
| Citation Start Page: | 697 |
| Citation Volume: | 97 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Early Cretaceous vein-related garnet granulite in Fiordland, southwest New Zealand: a case for infiltration of mantle-derived CO2-rich fluids; 1989; Article; Journal; Journal of Geology; Bradshaw, J. Y. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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