Melting dynamics beneath the Tonga-Kermadec Island are inferred from Pa-231-U-235 systematics

Authors
Bourdon, B Turner, S Allegre, C
Citation
B. Bourdon et al., Melting dynamics beneath the Tonga-Kermadec Island are inferred from Pa-231-U-235 systematics, SCIENCE, 286(5449), 1999, pp. 2491-2493
Citations number
27
Categorie Soggetti
Multidisciplinary,Multidisciplinary,Multidisciplinary
Journal title
SCIENCE
ISSN journal
00368075 → ACNP
Volume
286
Issue
5449
Year of publication
1999
Pages
2491 - 2493
Database
ISI
SICI code
0036-8075(199912)286:5449<2491:MDBTTI>2.0.ZU;2-E
Abstract
Measurement of Pa-231-U-235 disequilibrium in Tonga-Kermadec island are Lav as (north of New Zealand) permits discrimination of the time scales and mec hanisms of fluid addition and partial melting. For Tonga Lavas, the (Pa-231 /U-235) 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 p artial melting overprinted those of fluid addition in the Kermadec Lavas re sulting in (Pa-231/U-235) ratios greater than 1.