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Buried Quaternary valleys in the south-western Baltic Sea (BurVal-Baltic)

波罗的海西南部埋藏的第四纪山谷（BurVal-Baltic）

基本信息

批准号：
262442046
负责人：
Professor Dr. Christian Hübscher
金额：
--
依托单位：
Institut für Geophysik (IfG)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/262442046?language=en
关键词：
Buried Quaternary valleys south western

项目摘要

This project strives for understanding the tectonic control on Buried Valley evolution. Buried Valleys (subglacial channels) are defined as deep channel-form features incised into the pre-Quaternary sedimentary record from glaciated terrains. These cut and fill structures have been a matter of intense debate in recent studies as they hold significant supplies of groundwater, they contain aggregate for construction and typically have a most complete sedimentary record of glacial geological processes and paleo-climate conditions. Their formation is generally attributed to subglacial melt-water transport incising the underlying strata during periods of glacial coverage. Several authors noticed a spatial correlation between Buried Valleys and tectonic faults beneath; however, a principle causative correlation was never established. For the suggested study we hold a dense profile grid comprising ca. 20.000 km of multi-channel and ca. 6.000 km of parametric sediment echosounder data from the south-western Baltic. These data allow for the first time a study of Buried Valley evolution on a basin wide scale by means of data that resolve both the detailed valley and valley fill geometry as well as faults and folds within the Post-Permian succession beneath. According to a preliminary interpretation of some profiles we elaborated the following working hypotheses to be tested: 1) The Post-Permian succession has been dissected by abundant near vertical faults. 2) The largest and most densely spaced Quaternary near vertical faults are associated with few kilometers wide and some 10 m high anticlines. 3) In some instances the observed fault-anticline assemblages are associated with vertical fluid migration. 4) The fault-anticline evolution facilitated and thus spatially controlled the incision of Buried Valleys. 5) The near vertical faults and associated anticlines result mainly from ice-load induced tectonics. We will approach these hypotheses by seismic interpretation. Hypotheses 1-4 will be tested by systematic mapping and quantification of Buried Valleys, near vertical faults and anticlines as well as seismic indicators for fluids. The ice-load induced tectonic concept is based on previously published, but rather local studies. Regarding this concept the here proposed project is a first and crucial step to quantify (ice-load induced) recent tectonics and its meaning for Quaternary geology on a basin wide scale. If the hypotheses hold, the resulting models bear the potential to influence Quaternary research in all regions of high latitudes which were temporally ice-covered. The expected abundance of near vertical faults which cross-cut the post-Permian strata represent possible fluid migration paths, which would represent important constrains for all applications which include models about ground water circulation.

本研究旨在了解构造对古河谷演化的控制作用。埋藏谷（冰下水道）被定义为从冰川地形切入前第四纪沉积记录的深水道状特征。这些挖填结构在最近的研究中引起了激烈的争论，因为它们拥有大量的地下水供应，它们含有建筑用骨料，并且通常具有最完整的冰川地质过程和古气候条件的沉积记录。它们的形成通常归因于冰下融水运输在冰川覆盖期间切割下伏地层。几位作者注意到了埋藏谷与其下构造断层之间的空间相关性;然而，从未建立起主要的因果相关性。对于建议的研究，我们持有一个密集的剖面网格，包括ca。20.000公里的多通道和CA。波罗的海西南部6.000公里参数沉积物回声测深仪数据。这些数据允许第一次在一个盆地的规模上的研究，通过数据，解决了详细的山谷和山谷填充的几何形状，以及故障和褶皱内的后二叠纪继承下面的埋藏谷的演变。根据对一些剖面的初步解释，我们提出了以下有待检验的工作假设：1）后二叠纪层序被丰富的近垂直断层切割。2)最大和最密集的第四纪近垂直断层与几公里宽，约10米高的背斜有关。3)在某些情况下，所观察到的断层-背斜组合与垂向流体运移有关。4)断背斜的演化促进了古河谷的下切，并在空间上控制了古河谷的下切。5)近垂直断层和相关的背斜主要是由冰荷载引起的构造。我们将通过地震解释来探讨这些假设。假设1-4将通过对埋藏谷、近垂直断层和背斜以及流体的地震指标进行系统测绘和量化来检验。冰荷载引起的构造概念是基于以前发表的，而是当地的研究。关于这一概念，这里提出的项目是量化（冰荷载引起的）近期构造及其在盆地范围内对第四纪地质学意义的第一步，也是关键的一步。如果假设成立，由此产生的模型有可能影响第四纪研究在所有地区的高纬度地区的时间被冰覆盖。横切后二叠纪地层的近垂直断层的预期丰度代表了可能的流体迁移路径，这将代表包括地下水循环模型在内的所有应用程序的重要约束。