A consistent magnetic polarity stratigraphy of late Neogene to Quaternary fluvial sediments from the Heidelberg Basin (Germany): A new time frame for the Plio–Pleistocene palaeoclimatic evolution of the Rhine Basin
A consistent magnetic polarity stratigraphy of late Neogene to Quaternary fluvial sediments from the Heidelberg Basin (Germany): A new time frame for the Plio–Pleistocene palaeoclimatic evolution of the Rhine Basin
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海德堡盆地（德国）新近纪晚期至第四纪河流沉积物的一致磁极性地层学：莱茵盆地上更新世古气候演化的新时间框架
DOI：
10.1016/j.gloplacha.2015.01.004
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发表时间：
2015
影响因子：
3.9
通讯作者：
Hambach
中科院分区：
文献类型：
--
作者：
Scheidt;Hambach
这项工作介绍了对海德堡盆地内三个地点的1150 m岩心材料进行磁性地层学调查的结果。岩芯与中欧西部上新世-更新世河流沉积物最厚的连续堆积物相交。由此产生的磁极地层包括每一个第四纪极性时，从而提供恒定的年龄限制下降到高斯松山边界（2.58马）。较老的矿床不能明确的日期，而是各种年龄-深度模型进行了讨论。我们基于我们的年代地层学解释的继承试探性的三个假设。A）随着时间的推移，住宿几乎不变。B）亚时期（约为20万年）可能出现间断，实际的阶跃式年龄-深度关系最好描述为斜率几乎恒定的平滑曲线。C）较长的年代和亚年代比较短的极性间隔具有更高的保存潜力。根据我们的三个假设，概率最高的地层情景导致维恩海姆和海德堡岩心最古老部分的最小年龄分别为> 5.235 Ma和> 4.187 Ma。因此，这项研究提供了第一个一致的磁极性地层准连续序列的晚第三纪第四纪河流沉积物在莱茵河盆地和一般在西欧中部。这种方法上独立的年代地层学提供了一个迫切需要的时间模式，为正在进行的构造和沉积学研究和重建的古气候，因为上新世在欧洲的这一部分。
This work presents the results of a magnetostratigraphic survey performed on 1150 m of core material from three sites within the Heidelberg Basin. The cores intersect one of the thickest continuous accumulations of Plio–Pleistocene fluvial sediments in western Central Europe. The resultant magnetic polarity stratigraphy includes every Quaternary polarity chron, thereby providing constant age constraint down to the Gauss–Matuyama Boundary (2.58 Ma). Older deposits cannot be unequivocally dated; instead, various age–depth models are discussed. We base our chronostratigraphic interpretation of the successions tentatively on three assumptions. A) The accommodation was almost constant over time. B) Hiatuses in the duration of subchrons (on the order of 0.2 Myr) may occur, and the actual step-like age–depth relationship is best depicted as a smooth curve with almost constant slope. C) Long chrons and subchrons have a higher preservation potential than shorter polarity intervals.The stratigraphic scenarios with the highest probability – based upon our three assumptions – lead to minimum ages of > 5.235 Ma and > 4.187 Ma for the oldest parts of the Viernheim and Heidelberg cores, respectively. Consequently, this study provides the first consistent magnetic polarity stratigraphy for quasi-continuous sequences of late Neogene to Quaternary fluvial sediments in the Rhine Basin and generally in western central Europe. This methodologically independent chronostratigraphy supplies an urgently required temporal model for on-going tectonic and sedimentological studies and the reconstruction of the palaeoclimate since the Pliocene in this part of Europe.