Field and geochemical constraints on mafic-felsic interactions, and processes in high-level arc magma chambers: An example from the Halfmoon Pluton, New Zealand
The ~140 Ma Halfmoon Pluton of Stewart Island, New Zealand, provides direct evidence for a number of physico-chemical processes that operate at depth within active arc settings. It is characterized by a sequence of mingled mafic sheets and enclaves that are preserved within intermediate-felsic host-rocks. Way-up structures and textures are consistent with a younging direction to the south, and allow a south-dipping magma chamber 'stratigraphy' to be constructed.The similarity in modal...[Show more]
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|Source:||Journal of Petrology|
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