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Geology; October 2003; v. 31; no. 10; p. 845-848; DOI: 10.1130/G19832.1
© 2003 Geological Society of America
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Evidence for rhenium enrichment in the mantle wedge from submarine arc–like volcanic glasses (Papua New Guinea)

Weidong Sun*,1, Richard J. Arculus*,2, Vickie C. Bennett*,3, Stephen M. Eggins*,3 and Raymond A. Binns*,4

1 Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia
2 Department of Geology, Australian National University, Canberra, ACT 0200, Australia
3 Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia
4 Commonwealth Scientific and Industrial Research Organisation, Exploration and Mining, North Ryde, NSW 1670, Australia

The low Re abundance in arc-type volcanic rocks characterized by high 187Os/188Os ratios is an unsolved puzzle of the 187Re-187Os isotope system, leaving a significant gap in our understanding of the evolution of the upper mantle–continental crust system. Here we report new observations of high Re concentrations in fresh, submarine-erupted—i.e., relatively undegassed—island arc–like volcanic glasses dredged from the eastern Manus Basin, offshore Papua New Guinea. These observations, together with previously published reports of high Re concentrations in arc-type melt inclusions, indicate that undegassed arc-type volcanic rocks and the mantle wedge are enriched in Re. Consequently, the Re concentration in the continental crust is likely to be as high as ~2 ppb, much higher than previously estimated. The low Re concentrations in subaerial arc-type volcanic rocks are probably due to Re loss during magma degassing.

Key Words: rhenium enrichment • Yb/Re • Cu/Re • submarine arc–type volcanic glasses • Manus Basin • continental-crust composition




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