10Be: recent applications in Earth sciences
10Be: recent applications in Earth sciences
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10Be：地球科学中的最新应用
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
L. Brown
中科院分区：
文献类型：
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作者：
L. Brown
10 Be是宇宙射线与地球大气和表面相互作用产生的宇宙成因同位素，具有化学和物理性质，可用作某些地球过程的示踪剂和少数物质的地质时钟。稳定同位素9 Be的稀有性使得10 Be可以在岩石、沉积物等的背景下以极低的水平在天然物质中检测到，现在可以达到低于105原子g-1的值，该值与1.3 x 106原子cm-2的全球平均年沉积速率相一致。Be对土壤和沉积物成分的亲和力足够高，与它们接触时能有效地固定Be，从而使10 Be能够作为沉积物迁移的示踪剂。1.5Ma的半衰期便于某些地质研究。在宇宙射线历史、锰结核的形成、远洋沉积作用、岛弧火山作用、土壤演变、土壤侵蚀和岩石风化等方面都有应用。
10Be, a cosmogenic isotope produced by cosmic rays interacting with the Earth ’s atmosphere and surface, has chemical and physical properties that make it useful as a tracer for some terrestrial processes and a geological clock for a few substances. The rarity of the stable isotope, 9Be, allows 10Be to be detected in natural materials at extremely low levels with backgrounds for rocks, sediments etc. below 105 atom g-1 now attainable, a value to be com pared with an average annual global deposition rate of 1.3 x 106 atom cm-2. The affinity of Be for the components of soil and sediment is sufficiently high that its contact with them effectively immobilizes it, thereby allowing 10Be to function as a tracer of sediment transport. The half-life of 1.5 Ma is convenient for some geological studies. Application has been found in cosmic-ray history, formation of manganese nodules, pelagic sedimentation, island-arc volcanism, soil evolution, soil erosion and rock weathering.