Rapid extensive erosion of the North Alpine foreland basin at 5–4 Ma

Rapid extensive erosion of the North Alpine foreland basin at 5–4 Ma
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5â4âMa 北高山前陆盆地快速广泛侵蚀

DOI:
10.1111/j.1365-2117.2011.00501.x
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发表时间:
2011
期刊:
影响因子:
3.2
通讯作者:
Oncken
Oncken
中科院分区:
地球科学1区
文献类型:
--
作者:
Cederbom;Schlunegger;Sinclair H;van der Beek P;Oncken

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对北阿尔卑斯前陆盆地瑞士部分进行了广泛的低温热年代学研究,目的是破译晚第三纪盆地的发展。磷灰石裂变径迹(AFT)年龄的威尔斯井位于远端和弱变形的高原磨拉石揭示了快速,公里级的侵蚀,在上新世早期开始。侵蚀的分布表明,晚中新世沉积速率沿盆地走向沿着有很强的梯度,向东北方向增加。此外,逆冲推覆的近端亚高山磨拉石内威尔斯井的AFT数据表明,上新世-更新世期间重新出现的构造活动和千米级的无序逆冲推覆作用。文献中考虑了驱动新近纪晚期盆地侵蚀和欧洲阿尔卑斯山加速侵蚀排放的几种不同机制。基于我们的AFT结果,我们重新评估以前发表的假设,并建议在气候和/或排水重组的变化,同时可能与预先存在的构造和地球动力的阿尔卑斯山地区的相互作用。
An extensive low‐temperature thermochronology study of the Swiss part of the North Alpine Foreland Basin has been conducted with the aim of deciphering the late Neogene basin development. Apatite fission‐track (AFT) ages from wells located in the distal and weakly deformed Plateau Molasse reveal rapid, km‐scale erosion with an onset in early Pliocene times. The distribution of erosion implies that there was a strong gradient in late Miocene deposition rates along the strike of the basin, with an increase towards the northeast. Additionally, renewed tectonic activity and km‐scale out‐of‐sequence thrusting during Plio‐Pleistocene times is indicated by AFT data from wells within the thrusted, proximal Subalpine Molasse. Several different mechanisms driving late Neogene basin erosion and accelerated erosional discharge from the European Alps have been considered in the literature. Based on our AFT results, we reevaluate previously published hypotheses, and suggest that a change in climate and/or drainage reorganisation coincided and possibly interacted with preexisting tectonic and geodynamic forces in the Alpine region.
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