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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
收藏
页码：517 / 520
页数：4
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