MANTLE PLUMES AND ENTRAINMENT - ISOTOPIC EVIDENCE

被引：857

作者：

HART, SR

HAURI, EH

OSCHMANN, LA

WHITEHEAD, JA

机构：

[1] Woods Hole Oceanographic Institution, Woods Hole

来源：

SCIENCE | 1992年 / 256卷 / 5056期

关键词：

D O I：

10.1126/science.256.5056.517

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：

Many oceanic island basalts show sublinear subparallel arrays in Sr-Nd-Pb isotopic space. The depleted upper mantle is rarely a mixing end-member of these arrays, as would be expected if mantle plumes originated at a 670-kilometer boundary layer and entrained upper mantle during ascent. Instead, the arrays are fan-shaped and appear to converge on a volume in isotopic space characterized by low Sr-87/Sr-86 and high Nd-143/Nd-144, Pb-206/Pb-204, and He-3/He-4 ratios. This new isotopic component may be the lower mantle, entrained into plumes originating from the core-mantle boundary layer.

引用

页码：517 / 520

页数：4

共 75 条

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