PREHNITE.PUMPELLYITE FACIES METAMORPHISM OF THE NEW BAY FORIVIATION, EXPLO|TS ZONE, NEWFOUNDLAND
wedge of andesitic volcaniclastic sediments inter-preted to have been deposited in an early Paleozoic arc-trench gap. The sediments have been meta' morphosed to prehnite-pumpellyite facies, but pum-pellyite is not common. A characteristic mineral assemblage is albite-f calcite + quartz f prehni...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.528.5099 http://rruff.info/doclib/cm/vol12/CM12_456.pdf |
| Summary: | wedge of andesitic volcaniclastic sediments inter-preted to have been deposited in an early Paleozoic arc-trench gap. The sediments have been meta' morphosed to prehnite-pumpellyite facies, but pum-pellyite is not common. A characteristic mineral assemblage is albite-f calcite + quartz f prehnite * chlorite 4 epidote. Field relations and mineral assemblages are interpreted as intlicating metamor-phism at temperatures on the order of 300*400'C and load pressures less than 1 kb. The high temper' atures were produced by injection of numerous thick dykes and sills which were feeders to the over-lying Lawrence Head pillow lavas. |
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