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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Quantifying passive margin denudation and landscape development using a combined fission-track thermochronology and cosmogenic isotope analysis approach
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Quantifying passive margin denudation and landscape development using a combined fission-track thermochronology and cosmogenic isotope analysis approach

机译：结合裂变径迹热年代学和宇宙成因同位素分析方法量化被动边缘剥蚀和景观发展

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摘要

A new approach to empirically constraining numerical models of denudation and landscape development across passive continental margins is presented involving a combination of apatite fission-track thermochronology and cosmogenic isotope analysis. This integrated strategy is applied to the Namibian sector of the south-west African margin where the conventional landscape evolution model of inland retreat of an escarpment initiated at the coast at break-up implies a mean rate of retreat of ～1 km Ma~(-1). The thermochronological and cosmogenic isotope data are incompatible with a simple escarpment retreat model since they show that denudation rates oceanward of the present escarpment position have been low (＜20 m Ma~(-1)) since the end of the Eocene, and the estimated rate of escarpment retreat has been only ～10 m Ma~(-1). This low rate of retreat is, however, consistent with numerical landscape evolution models where the escarpment is pinned at an inland drainage divide.
机译：提出了一种新的经验方法来限制被动大陆边缘剥蚀和景观发展的数值模型，该方法涉及磷灰石裂变径迹热年代学和宇宙成因同位素分析的结合。这种综合策略适用于西南非洲边缘的纳米比亚地区，该地区的传统内陆退缩退缩内陆退缩景观演变模型表明，平均退缩率约为1 km Ma〜（- 1）。热年代学和宇宙成因同位素数据与简单的悬崖退缩模型不兼容，因为它们表明自始新世末期以来，当前悬崖位置向海的剥蚀率一直很低（＜20 m Ma〜（-1）），并且估计陡坡退缩速度仅为〜10 m Ma〜（-1）。但是，如此低的退缩率与数字化景观演化模型一致，在该模型中，悬崖被固定在内陆排水沟处。

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