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Geology; September, 2007; v. 35; no. 9; p. 787-790; DOI: 10.1130/G23637A.1
© 2007 Geological Society of America
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Amphibole "sponge" in arc crust?

Jon Davidson*,1, Simon Turner*,2, Heather Handley*,3, Colin Macpherson*,4 and Anthony Dosseto*,5

1 Department of Earth Sciences, University of Durham, South Road, Durham DH1 3LE, UK
2 Geochemical Evolution and Metallogeny of Continents (GEMOC), Department of Earth and Planetary Sciences, Macquarie University, Sydney NSW 2109, Australia
3 Department of Earth Sciences, University of Durham, South Road, Durham DH1 3LE, UK, and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney NSW 2109, Australia
4 Department of Earth Sciences, University of Durham, South Road, Durham DH1 3LE, UK
5 GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney NSW 2109, Australia

Pressure-temperature-time paths followed by arc magmas ascending through the lithosphere dictate the phase assemblage that crystallizes, and hence the compositions of liquid fractionates. Here we use La/Yb and Dy/Yb versus SiO2 relationships from selected volcanoes to show that amphibole is an important mineral during differentiation of arc magma. Production of intermediate and silicic arc magmas occurs as magmas stall and cool in the mid-lower crust, where amphibole is stable. Because amphibole is rarely a phenocryst phase, we term this "cryptic amphibole fractionation." If this process is as widespread as our investigation suggests, then (1) amphibole cumulates may act as an effective filter for water dissolved in mantle-derived magmas; (2) amphibole cumulates may act as a fertile source of intracrustal melts and fluids; and (3) recycling of amphibole cumulates has the potential to return incompatible trace elements and water to the mantle.

Key Words: amphibole • recycling • crustal origin • rare earth elements • magma • basalt • fractionation • arcs




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