Melting dynamics beneath the Tonga-Kermadec island arc inferred from 231Pa-235U systematics

Bernard Bourdon; Simon Turner; Claude Allègre

doi:10.1126/science.286.5449.2491

Melting dynamics beneath the Tonga-Kermadec island arc inferred from ²³¹Pa-²³⁵U systematics

Bernard Bourdon^*, Simon Turner, Claude Allègre

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

58 Citations (Scopus)

Abstract

Measurement of ²³¹Pa-²³⁵U disequilibrium in Tonga-Kermadec island arc lavas (north of New Zealand) permits discrimination of the time scales and mechanisms of fluid addition and partial melting. For Tonga lavas, the (²³¹Pa/²³⁵U) ratios are less than 1 and can be explained by fluid addition from the subducting plate around 60,000 years ago. In contrast, the effects of partial melting overprinted those of fluid addition in the Kermadec lavas resulting in (²³¹Pa/²³⁵U) ratios greater than 1.

Original language	English
Pages (from-to)	2491-2493
Number of pages	3
Journal	Science
Volume	286
Issue number	5449
DOIs	https://doi.org/10.1126/science.286.5449.2491
Publication status	Published - 24 Dec 1999
Externally published	Yes

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abstract = "Measurement of 231Pa-235U disequilibrium in Tonga-Kermadec island arc lavas (north of New Zealand) permits discrimination of the time scales and mechanisms of fluid addition and partial melting. For Tonga lavas, the (231Pa/235U) ratios are less than 1 and can be explained by fluid addition from the subducting plate around 60,000 years ago. In contrast, the effects of partial melting overprinted those of fluid addition in the Kermadec lavas resulting in (231Pa/235U) ratios greater than 1.",

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AU - Allègre, Claude

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AB - Measurement of 231Pa-235U disequilibrium in Tonga-Kermadec island arc lavas (north of New Zealand) permits discrimination of the time scales and mechanisms of fluid addition and partial melting. For Tonga lavas, the (231Pa/235U) ratios are less than 1 and can be explained by fluid addition from the subducting plate around 60,000 years ago. In contrast, the effects of partial melting overprinted those of fluid addition in the Kermadec lavas resulting in (231Pa/235U) ratios greater than 1.

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Melting dynamics beneath the Tonga-Kermadec island arc inferred from ²³¹Pa-²³⁵U systematics

Abstract

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