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原地生成宇宙成因核素测年技术思考三暴露侵蚀埋藏再暴露和地表升降过程的双核素投影
Authors
李岩
李广伟
+4 more
程杨
董国成
赵亮亮
黄费新
Publication date
1 January 2019
Publisher
Abstract
双核素稳态侵蚀岛投影是原地生成宇宙成因核素测年技术中判断样品是否具有复杂暴露历史和估计侵蚀速率的常用方法。暴露、侵蚀、埋藏和再暴露的投影图可依据传统核素浓度计算等式利用计算机编程绘出。利用新推出的地表持续抬升与下降过程中样品的核素浓度与生成速率(及加速率)、侵蚀速率及暴露时间的计算等式,对其~(26)Al/~(10)Be浓度比值相对于~(10)Be浓度/~(10)Be生成速率比值投影分别进行了计算机模拟,发现下降样品的投影可高于或右偏于稳态侵蚀岛,而抬升样品的投影仍然在稳态侵蚀岛内。利用持续地表下降,可以解释已往文献数据中一次性暴露样品投影高于或右偏于稳态侵蚀岛的“不合理”现象,而持续抬升对投影结果的影响类似于侵蚀,因此如果忽略抬升,计算的暴露年龄结果将偏小
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Institutional Repository of Institute of Earth Environment, CAS
See this paper in CORE
Go to the repository landing page
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oai:ir.ieecas.cn:361006/12463
Last time updated on 30/05/2020
Institutional Repository of Institute of Earth Environment, CAS
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:ir.ieecas.cn:361006/12465
Last time updated on 30/05/2020