THE Re-Os ISOTOPE SYSTEM IN COSMOCHEMISTRY AND HIGH-TEMPERATURE GEOCHEMISTRY
THE Re-Os ISOTOPE SYSTEM IN COSMOCHEMISTRY AND HIGH-TEMPERATURE GEOCHEMISTRY
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DOI：
10.1146/annurev.earth.26.1.423
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发表时间：
1998-05
影响因子：
14.9
通讯作者：
S. Shirey;R. Walker
中科院分区：
文献类型：
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作者：
S. Shirey;R. Walker
Re-Os同位素体系是以187 Re到187 Os的长寿命β−跃迁为基础的同位素体系，在宇宙化学和高温地球化学中得到了广泛的应用。Re和Os的亲铁/亲铜行为与组成大多数其他长寿命放射性同位素系统的元素不同。岩浆铁陨石（IIIAB、IIAB、IVA和IVB）的Re-Os等时线表明，在太阳系演化的前1000万至4000万年内，小行星的核心结晶。从地球的对流地幔的岩石一般表现出在整个地球的历史，这是解释了高度亲铁性元素的地幔后，通过后期吸积核心形成的Re-Os演化。大洋玄武岩的锇同位素系统学，提高了详细的地质解释现存的地幔成分。部分古陆岩石圈地幔严重亏损Re，并具有相应的亚地幔性187 Os/188 Os，表明古陆岩石圈地幔长期处于亏损状态。
▪ Abstract The Re-Os isotope sytem, based on the long-lived β− transition of 187Re to 187Os, has matured to wide use in cosmochemistry and high-temperature geochemistry. The siderophilic/chalcophilic behavior of Re and Os is different from that of the elements that comprise most other long-lived radiogenic isotope systems. Magmatic iron meteorites (IIIAB, IIAB, IVA, and IVB) have Re-Os isochrons that indicate asteroidal core crystallization within the first 10–40 million years of Solar System evolution. Rocks from Earth's convecting mantle show generally chondritic Re/Os evolution throughout Earth history that is explained by the addition of highly siderophile elements to the mantle after core formation via late accretion. Oceanic basalts have Os-isotope systematics that improve the detailed geological interpretation of extant mantle components. Some portions of ancient subcontinental lithospheric mantle are severely depleted in Re and have correspondingly subchondritic 187Os/188Os, indicating long-term i...