Dating sediment burial with in situ-produced cosmogenic nuclides: theory, techniques, and limitations
Dating sediment burial with in situ-produced cosmogenic nuclides: theory, techniques, and limitations
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DOI：
10.1016/s0012-821x(01)00309-0
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发表时间：
2001-05-30
影响因子：
5.3
通讯作者：
Muzikar, PF
中科院分区：
文献类型：
--
作者：
Granger, DE;Muzikar, PF
在地球科学和考古学的许多领域中，对百万年时间尺度的沉积物埋藏进行测定至关重要，但使用传统技术往往很困难。沉积物埋藏可以通过宇宙成因核素的放射性衰变来确定年代，前提是沉积物在埋藏前暴露于宇宙射线。如果沉积物埋藏得足够深且足够快，足以防止埋藏后产生宇宙源核素，那么测年计算就很简单。然而。如果沉积物没有充分屏蔽次级宇宙射线核子和μ子，则埋藏后产生的分析可能会变得复杂。本文讨论了如何使用石英中的 Al-26 和 Be-10 在高达 5 Myr 的时间尺度上对埋藏沉积物进行测年。 (C) 2001 年由 Elsevier Science B.V. 出版
Dating sediment burial over million-year time scales is crucial in many areas of the Earth sciences and archeology, but is often difficult using traditional techniques. Sediment burial can be dated by the radioactive decay of cosmogenic nuclides, provided that the sediment was exposed to cosmic rays prior to burial. Dating calculations are straightforward if sediment is buried deeply and rapidly enough to prevent cosmogenic nuclide production after burial. However. the analysis can be complicated by postburial production if sediment is insufficiently shielded from secondary cosmic-ray nucleons and muons. This paper discusses how buried sediments can be dated over timescales up to 5 Myr using Al-26 and Be-10 in quartz. (C) 2001 Published by Elsevier Science B.V.