Constraints on mantle melting at mid-ocean ridges from global U-238-Th-230 disequilibrium data

被引：96

作者：

Bourdon, B

Zindler, A

Elliott, T

Langmuir, CH

机构：

[1] FLORIDA STATE UNIV, DEPT GEOL, TALLAHASSEE, FL 32306 USA

[2] FLORIDA STATE UNIV, NATL HIGH MAGNET FIELD LAB, TALLAHASSEE, FL 32306 USA

[3] VRIJE UNIV AMSTERDAM, FAC AARDWETENSCHAPPEN, NL-1081 HV AMSTERDAM, NETHERLANDS

来源：

NATURE | 1996年 / 384卷 / 6606期

关键词：

D O I：

10.1038/384231a0

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 ; 0710 ; 09 ;

摘要：

The extent of radioactive disequilibrium between U-238 and its daughter product Th-230 in midocean-ridge basalts from around the world is negatively correlated with axial ridge depth; local positive correlations with inferred mantle source composition are also observed. The larger Th-230 excesses seen in samples from shallow ridges reflect a larger melt contribution from a garnet-bearing source which may be explained by a deepening of the solidus in hotter mantle regions. These observations provide important constraints for modelling melt generation at mid-ocean ridges.

引用

页码：231 / 235

页数：5

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