Feedback between erosion and active deformation: geomorphic constraints from the frontal Jura fold-and-thrust belt (eastern France)
Feedback between erosion and active deformation: geomorphic constraints from the frontal Jura fold-and-thrust belt (eastern France)
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DOI：
10.1007/s00531-009-0468-7
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发表时间：
2010-10
影响因子：
2.3
通讯作者：
H. Madritsch;O. Fabbri;Eva-Marie Hagedorn;F. Preusser;S. Schmid;P. A. Ziegler
中科院分区：
文献类型：
--
作者：
H. Madritsch;O. Fabbri;Eva-Marie Hagedorn;F. Preusser;S. Schmid;P. A. Ziegler
区域构造地貌分析表明，汝拉褶皱冲断带最外段的上新世至近代岩石隆起，在空间上与大陆内莱茵-布雷斯转换带相吻合。通过重矿物分析确定的上新世中期Sundgau-Forêt de Chaux砾石被部分侵蚀的隆起遗迹允许进行古地形重建，得出最小区域上新世晚期至现代岩石隆起速率为0.05 ± 0.02 mm/年。这一隆升也影响了更新世的Ognon和Doubs流域的演变，被解释为受构造控制。当Ognon河偏离隆起区域时，Doubs河深深地切入其中。Doubs河的集中切割可能使沿着背斜持续变形，这些背斜是在薄皮汝拉褶皱冲断带的新近纪演化期间开始的。目前，这种与侵蚀有关的活动变形与厚皮构造同步发生，控制着莱茵-布雷斯转换带的反转。这表明中生代盖层序列的孕震基底断裂和侵蚀相关变形之间存在局部解耦。
A regional tectono-geomorphic analysis indicates a Pliocene to recent rock uplift of the outermost segment of the Jura fold-and-thrust belt, which spatially coincides with the intra-continental Rhine-Bresse Transfer Zone. Elevated remnants of the partly eroded Middle Pliocene Sundgau-Forêt de Chaux Gravels identified by heavy mineral analyses allow for a paleo-topographic reconstruction that yields minimum regional Latest Pliocene to recent rock uplift rates of 0.05 ± 0.02 mm/year. This uplift also affected the Pleistocene evolution of the Ognon and Doubs drainage basins and is interpreted as being tectonically controlled. While the Ognon River was deflected from the uplifted region the Doubs deeply incised into it. Focused incision of the Doubs possibly sustained ongoing deformation along anticlines which were initiated during the Neogene evolution of the thin-skinned Jura fold-and-thrust belt. At present, this erosion-related active deformation is taking place synchronously with thick-skinned tectonics, controlling the inversion of the Rhine-Bresse Transfer Zone. This suggests local decoupling between seismogenic basement faulting and erosion-related deformation of the Mesozoic cover sequences.