142Nd evidence for early (>4.53 Ga) global differentiation of the silicate Earth

被引：506

作者：

Boyet, M ^{[1
]}

Carlson, RW ^{[1
]}

机构：

[1] Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC 20015 USA

来源：

SCIENCE | 2005年 / 309卷 / 5734期

关键词：

D O I：

10.1126/science.1113634

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：

New high-precision samarium-neodymium isotopic data for chondritic meteorites show that their Nd-142/Nd-144 ratio is 20 parts per million lower than that of most terrestrial rocks. This difference indicates that most (70 to 95%) of Earth's mantle is compositionally similar to the incompatible element-depleted source of mid-ocean ridge basalts, possibly as a result of a global differentiation 4.53 billion years ago (Ga), within 30 million years of Earth's formation. The complementary enriched reservoir has never been sampled and is probably located at the base of the mantle. These data influence models of Earth's compositional structure and require revision of the timing of global differentiation on Earth's Moon and Mars.

引用

页码：576 / 581

页数：6

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142Nd evidence for early (&gt;4.53 Ga) global differentiation of the silicate Earth

142Nd evidence for early (>4.53 Ga) global differentiation of the silicate Earth