Coupled 186Os and 187Os evidence for core-mantle interaction

被引：233

作者：

Brandon, AD ^{[1
]}

Walker, RJ

Morgan, JW

Norman, MD

Prichard, HM

机构：

[1] Univ Maryland, Dept Geol, Isotope Geochem Lab, College Pk, MD 20742 USA

[2] Colorado State Univ, Dept Earth Resources, Ft Collins, CO 80523 USA

[3] Macquarie Univ, Sch Earth Sci, GEMOC, N Ryde, NSW 2109, Australia

[4] Univ Wales, Dept Earth Sci, Cardiff CF1 3YE, S Glam, Wales

来源：

SCIENCE | 1998年 / 280卷 / 5369期

关键词：

D O I：

10.1126/science.280.5369.1570

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：

Osmium isotopic analyses of picritic lavas from Hawaii show enrichments in the osmium-186/osmium-188 ratio (Os-186/Os-188) of 0.008 to 0.018%, relative to a chondritic upper mantle, that are positively correlated with enrichments in Os-187/Os-188 Of 5.4 to 9.0%. The most viable mechanism to produce these coupled Os-186 and Os-187 enrichments is by addition of 0.5 to 1 weight percent of outer core metal to a portion of the D " layer and subsequent upwelling of the mixture. These data suggest that some plumes originate at the core-mantle boundary and that Os isotopes may be used to distinguish plumes derived from shallow versus deep mantle sources.

引用

页码：1570 / 1573

页数：4

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