Direction of fluid flow during contact metamorphism around the Burstall granite, Australia

Article Abstract:

Up-temperature fluid flow during contact metamorphism is examined via analysis of adjacent marbles of the Burstall granite in Australia. Devolatization reactions may have yielded such water-richfluids. On the other hand, down-temperature granite flow resulted in fluids that formed Fe-rich skarns emplaced closer to the granite. Such contrasting fluid-flow regimes are predicted by various models describing fluid flow aroundcooling plutons, but little evidence exists of such fluid dynamics around mesozonal plutons.

Analysis, Australia, Metamorphism (Geology), Metasomatism (Mineralogy), Metasomatism

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Petrogenesis of the Potato Hill pluton, Newfoundland: transpression during the Grenvillian orogenic cycle?

Article Abstract:

An analysis describing the petrogenesis of the Potato Hill Pluton is presented. The pluton is a nested, composite, Grenvillian intrusion found in Newfoundland which is composed of pyroxene-bearing quartz monzodiorite, equigranular biotite plus hornblende plus garnet granite and K-feldspar megacrystic hornblende plus biotite quartz monzodiorite. It is shown that the pluton was created in a transpressional period during a Late-Orogenic stage.

Newfoundland and Labrador, Petrogenesis, Newfoundland

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