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

被引：48

作者：

Bourdon, B

Turner, S

Allègre, C

机构：

[1] Inst Phys Globe, CNRS, UMR 7579, Lab Geochim & Cosmochim, F-75252 Paris 05, France

[2] Open Univ, Dept Earth Sci, Milton Keynes MK7 6AA, Bucks, England

来源：

SCIENCE | 1999年 / 286卷 / 5449期

关键词：

D O I：

10.1126/science.286.5449.2491

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 [理学]; 0710 [生物学]; 09 [农学];

摘要：

Measurement of Pa-231-U-235 disequilibrium in Tonga-Kermadec island are Lavas (north of New Zealand) permits discrimination of the time scales and mechanisms 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 partial melting overprinted those of fluid addition in the Kermadec Lavas resulting in (Pa-231/U-235) ratios greater than 1.

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页码：2491 / 2493

页数：3

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