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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 >New cosmogenic nuclide burial-dating model indicates onset of major glaciations in the Alps during Middle Pleistocene Transition
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New cosmogenic nuclide burial-dating model indicates onset of major glaciations in the Alps during Middle Pleistocene Transition

机译：新的富含核素埋葬模型表明中间渗透过程中阿尔卑斯山脉的主要冰川发作

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A set of four outwash terraces in the northern Alpine Foreland motivated Penck and Bruckner's classical scheme of four great Alpine ice ages: Giinz, Mindel, Riss, and Wiirm. While it is now established that the Wiirm corresponds to marine isotope stages (MIS) 5d-2 (similar to 117-14 ka) and the Riss type locality to MIS 6 (similar to 191-130 ka), there is no consensus regarding the age of the older glaciations. The two oldest terraces, known as TIOhere Deckenschotter (HDS) and Tiefere Deckenschotter (TDS) in Switzerland and neighbouring Germany, contain interbedded tills that directly indicate the first arrival of glaciers into the northern Alpine Foreland. Here, we set out to constrain the timing of the HDS, which signal the first major glaciations in the Alps. To achieve this goal, we devised a new burial-dating model tailored to glaciogenic sediments: P-PINI (Particle Pathway Inversion of Nuclide Inventories). The method applies a source-to-sink framework to a cosmogenic (BeAl)-Be-10-Al-26 inversion model accounting for variable cosmic-ray exposure and non-steady erosion. Taking published (BeAl)-Be-10-Al-26 data from five HDS sites (Feusi, Tromsberg, Siglistorf, Irchel Steig, and Irchel Hiltz) and one TDS site (Iberig), we obtain age distributions (+/- 1 sigma) that are especially well constrained for Feusi (0.93 +/- 0.13 Ma), Iberig (0.93 +/- 0.17 Ma), and Tromsberg (0.88 +/- 0.14 Ma), less well-constrained for Irchel Steig (0.69 +/- 0.25 Ma) and Siglistorf (0.94 +/- 0.27 Ma), and very poorly constrained for Irchel Hiltz (1.39 +/- 0.56 Ma). Consistent with the morphostratigraphy, which dictates that the TDS postdates the HDS, we implemented a Bayesian modelling framework, yielding an age of 0.69 +/- 0.12 Ma for Iberig (TDS) and a combined age of 0.95 +/- 0.07 Ma for the HDS sites. Based on the P-PINI burial ages as well as the combined, Bayesian burial age, we propose an age around 1.0-0.9 Ma for the onset of the large Alpine glaciations that triggered the accumulation of the HDS outwash sediments. This roughly accords with the first long glaciation of the Pleistocene (MIS 24-22), identified as a step-change to colder climate and larger glaciations towards the end of the Middle Pleistocene Transition. While our results challenge previously reported ages of similar to 2 Ma or more for the HDS in Switzerland, they corroborate evidence from the southern Alpine retroforeland and provide quantitative support for the early hypothesis by GJ. Kukla, who ascribed the oldest glacial deposits in the northern Alpine Foreland to around MIS 22. Finally, we suggest that the source-to-sink approach of P-PINI offers a viable alternative to the established isochron burial-dating method in cases involving non-steady exposure and erosion. (C) 2020 Elsevier B.V. All rights reserved.
机译：在北方阿尔卑斯山前一组四个冰水沉积阶动机，彭克和布鲁克纳的四大高山冰河时代经典方案：Giinz，明德，里斯和Wiirm。虽然现已确定可将Wiirm对应于海洋同位素阶段（MIS）5D-2（类似于117-14 KA）和里斯类型局部性到MIS 6（类似于191-130 KA），没有关于共识年龄较老的冰期。两个最老阳台，称为TIOhere Deckenschotter（HDS）和Tiefere Deckenschotter（TDS）在瑞士和邻近的德国，包含互钱柜直接指示冰川的第一到达到北部高山前陆。在这里，我们开始着手约束HDS的时间，其信号在阿尔卑斯山的第一大冰期。为了实现这一目标，我们制定了针对glaciogenic沉积物新的墓地约会模式：P-PINI（核素库存的粒子途径反转）。所述方法施加源到宿框架到宇宙成因（比尔）-Be-10的Al-26反演模型占可变宇宙射线曝光和非稳定的侵蚀。以出版（比尔）-Be-10的Al-26从五个HDS网站（Feusi，Tromsberg，锡格利斯托夫，Irchel斯泰格和Irchel希尔茨）和一个TDS网站（Iberig），我们得到的数据的年龄分布（+/- 1西格马），其特别好地为约束Feusi（0.93 +/- 0.13马），Iberig（0.93 +/- 0.17 MA）和Tromsberg（0.88 +/- 0.14马），较差的约束为Irchel斯泰格（0.69 +/- 0.25马）和锡格利斯托夫（0.94 +/- 0.27 MA）和非常差的约束为Irchel希尔茨（1.39 +/- 0.56 MA）。与morphostratigraphy，这决定了TDS晚于HDS，我们实现了一个贝叶斯建模框架，得到的年龄一致0.69 +/- 0.12马为Iberig（TDS）和0.95 +/- 0.07马的用于HDS组合年龄站点。基于P-PINI埋藏年龄以及合并，贝叶斯墓葬的时代，我们提出围绕1.0-0.9马的年龄触发HDS的积累冰水沉积沉积物中的大量高山冰川的发作。这大致与更新世（MIS 24-22）的第一长冰川，鉴定为阶跃变化到较冷气候和更大的冰川朝向更新世过渡的端部相符。虽然我们的研究结果挑战以前报道的类似年龄为2 mA以上的HDS在瑞士，他们从阿尔卑斯南部retroforeland印证的证据，并提供由GJ早期假设定量的支持。库克拉，谁冲高北部阿尔卑斯山前最古老的冰川沉积物围绕MIS 22.最后，我们建议P-PINI的源到接收器方法提供了在涉及非案件一个可行的替代既定的等时线埋藏测年法-steady曝光和侵蚀。 （c）2020 Elsevier B.v.保留所有权利。

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