赵旭东,
张会平^,,
熊建国
中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029

基金项目: 第二次青藏高原综合科学考察研究项目(批准号:2019QZKK0704)和国家自然科学基金项目(批准号:41622204和41761144071)共同资助


详细信息

作者简介: 赵旭东, 男, 26岁, 博士研究生, 构造地质学专业, E-mail:505808389@qq.com

通讯作者: 张会平, E-mail:huiping@ies.ac.cn

中图分类号: P597;P931.2

收稿日期:2019-04-30
修回日期:2019-07-25
刊出日期:2019-09-30

Theory and application of cosmogenic nuclide ¹⁰Be in the study of paleoerosion rate

Zhao Xudong,
Zhang Huiping^,,
Xiong Jianguo
State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China



More Information

Corresponding author: Zhang Huiping,E-mail:huiping@ies.ac.cn

MSC: P597;P931.2

--> Received Date: 30 April 2019
Revised Date: 25 July 2019
Publish Date: 30 September 2019


摘要
摘要:河流沉积物中的宇宙成因核素¹⁰Be记录了百万年尺度的古侵蚀速率信息，为定量揭示构造-气候-地表侵蚀之间的耦合关系提供了一个可靠途径。尽管目前基于宇宙成因核素获取古侵蚀速率的相关研究尚处于起步阶段，然而这一方法弥补了以往通过盆地沉积速率表征古侵蚀速率带来的缺陷和不足，同时相对热年代学方法具有更高的时间分辨率。本文在回顾宇宙成因核素法计算流域平均侵蚀速率原理的基础上，重点阐述了近年来有关基于河流沉积物中的¹⁰Be核素浓度获取古侵蚀速率的方法原理、计算参数、假设（前提）条件和采样策略，以期促进该方法在地表-地貌过程领域得到更广泛的应用。随后总结了应用该方法解释或揭示构造和气候驱动地貌演化的研究实例；并以此为基础，思考了古侵蚀速率研究的未来应用方向，即有望进一步揭示构造、气候和地表侵蚀过程三者之间的相互关系，进而助推青藏高原晚新生代以来地貌、地形演化的定量化发展。
关键词: 宇宙成因核素/
¹⁰Be/
古侵蚀速率

Abstract:Cosmogenic nuclide ¹⁰Be in fluvial sediments records the information of paleo-erosion rate on million-year scale, which provides a reliable way to quantitatively reveal the interactions among tectonics, climate, and surface processes. Although the study on the acquisition of paleo-erosion rate based on cosmogenic nuclides is still in its infancy, this approach makes up the limitations and shortcomings of evaluating the erosion rate by the sedimentation rate in basin, and has a higher temporal resolution than the thermochronometers. On the basis of reviewing the principle of calculating the catchment-averaged erosion rate by in situ produced cosmogenic ¹⁰Be concentration, we mainly elaborated the theories, calculation parameters, assumptions, preconditions and sampling strategies of acquiring paleo-erosion rates using ¹⁰Be nuclide concentration from fluvial sediments, and were aiming to promote more applications use of this approach in the studies of surface processes. Subsequently, case studies have been summarized to reveal the tectonic or climatic driven geomorphological evolution by using this method. Lastly, the future application direction of paleoerosion rate research would be considered, which is expected to clarify the interrelationship among tectonic, climatic and surface erosion processes, and further promote the quantitative research of the geomorphological evolution of the Tibetan Plateau during the Late Cenozoic.
Key words:cosmogenic nuclide/
¹⁰Be/
paleo-erosion rates



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