Inversion of provenance data and sediment load into spatially varying erosion rates

De Doncker Fien; Herman Frederic; Fox Matthew

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Inversion of provenance data and sediment load into spatially varying erosion rates

机译：将出处数据和沉积物负荷的反转变为空间不同的侵蚀率

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Sediment fingerprinting methods aim to determine the relative contribution of different source areas in detrital sediments based on natural properties - fingerprints - of the source areas. Here, we use U/Th-Pb age signatures as fingerprints, assuming that the age signal is not altered during erosion-transportation-deposition events, and given that recent technological advances enable precise dating of large amounts of grains. We introduce a formal inversion method that allows to disentangle the amalgamation of source contributions in detrital zircon data and enables to convert this information into an erosion rate map starting from the spatial distribution of zircon age signatures. Relying on the least-squares method and using prior and covariance information to deal with non-uniqueness, we show, using synthetic and natural examples, that we are able to retrieve erosion rate patterns of a catchment when the age distribution and zircon fertility for each source area are well known. Moreover, we show that not only zircon age fingerprints but also other tracers such as mineral content can be used. Furthermore, we found that adding data from samples taken at the outlet of tributaries improves the estimation of erosion rate patterns. We conclude that the least squares inverse model applied to detrital data has great potential for investigating erosion rates. (c) 2020 John Wiley & Sons, Ltd.

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来源
《Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group》 |2020年第15期|共23页
作者
De Doncker Fien; Herman Frederic; Fox Matthew;
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作者单位

Univ Lausanne Inst Earth Surface Dynam Lausanne Switzerland;

Univ Lausanne Inst Earth Surface Dynam Lausanne Switzerland;

UCL UCL Earth Sci London England;

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原文格式 PDF
正文语种 eng
中图分类地球物理学;
关键词
formal inversion; provenance analysis; erosion rates; U; Pb zircon ages; detrital zircon data;

机译：正式的反演;源分析;侵蚀率;u;Pb zircon年龄;Detrital zircon数据;

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Inversion of provenance data and sediment load into spatially varying erosion rates

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