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Metamorphism

Water from stone

Where the Pacific and Australian tectonic plates collide under the South Island of New Zealand large quantities of aqueous fluid are produced. But how does this happen? Geophysical and petrological data indicate that it may not be as we thought.

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Figure 1: The breakdown of greenschist minerals such as epidote and chlorite into 'higher-grade' metamorphic minerals such as biotite and plagioclase releases aqueous fluids.

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Wannamaker, P. Water from stone. Nature Geosci 3, 10–11 (2010). https://doi.org/10.1038/ngeo732

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