A latest Eocene depocenter in between uplifted masses (SW Netherlands and NW Belgium)

IF 1.8 3区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY International Journal of Earth Sciences Pub Date : 2024-09-18 DOI:10.1007/s00531-024-02461-3
Jef Deckers, Dirk Munsterman, Bernd Rombaut, Andreas Kruisselbrink
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Abstract

Under Priabonian (latest Eocene) far-field compression, the major Jurassic graben systems and their proximal areas experienced domal uplift in the Netherlands and northeastern Belgium. It has been proposed that this flexural uplift was simultaneous with flexural subsidence of the surrounding areas. This hypothesis is, however, only based on the correlation of few widely spaced boreholes without supporting biostratigraphic or seismic data. For this study, a seismic line and cross-boundary borehole log correlation panel, comprising three biostratigraphically analyzed boreholes, were used to critically examine the abovementioned hypothesis. The seismic line and correlation panel run from the southern flank of the uplifted West Netherlands Basin, also known as the Voorne Trough, towards the south. They both show a gradual thickening of the Priabonian sequences towards the Voorne Trough, confirming the flexural subsidence hypothesis. The underlying Bartonian and overlying lowermost Rupelian units do not share the abovementioned thickness trend, which highlights the particularity of Priabonian basin dynamics. Within the Priabonian depocenter, plenty of reworked organic material was deposited, mostly of Bartonian age, providing further evidence of the simultaneity of subsidence and uplift in nearby regions. We consider it very likely that subsidence and uplift were part of the same vertical surface deformation process. The results of this study are consistent with the mechanism of lithospheric folding under far-field compression by the convergence between Africa and Europe. A Priabonian N-S compressional stress-field would also be consistent with fault, joint and vein analyses performed at the British Isles west of the study area. As the regional stress-field changed around the Eocene–Oligocene boundary, the vertical surface movements of the study area also changed.

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位于隆起地块之间的新近纪沉积中心(荷兰西南部和比利时西北部)
在普里阿本纪(始新世晚期)远场压缩作用下,荷兰和比利时东北部的主要侏罗纪地堑系统及其近区经历了穹隆隆起。有人提出,这种挠性隆起与周围地区的挠性沉降是同时发生的。然而,这一假设仅仅基于几个间距较大的钻孔的相关性,而没有生物地层学或地震数据的支持。在本研究中,使用了地震测线和交叉边界钻孔测井记录相关面板,包括三个经生物地层学分析的钻孔,对上述假设进行了批判性研究。地震测线和相关面板从隆起的西荷兰盆地(又称沃尔内海槽)南侧向南延伸。它们均显示普里阿本纪序列向沃尔内海槽逐渐增厚,证实了挠曲下沉假说。下伏的巴顿期(Bartonian)和上覆的最下层鲁佩尔期(Rupelian)单元并不具有上述厚度趋势,这凸显了普里阿本纪盆地动力学的特殊性。在普里阿本纪沉积中心,沉积了大量的再加工有机物质,其中大部分是巴顿纪的物质,这进一步证明了附近地区沉降和隆升的同时性。我们认为,沉降和隆起很可能是同一垂直地表变形过程的一部分。这项研究的结果与非洲和欧洲交汇造成的远场压缩下的岩石圈褶皱机制是一致的。普里阿本纪的 N-S 压缩应力场也与在研究区域以西的不列颠群岛进行的断层、节理和脉络分析相一致。随着始新世-更新世边界附近区域应力场的变化,研究区域的垂直地表运动也发生了变化。
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来源期刊
International Journal of Earth Sciences
International Journal of Earth Sciences 地学-地球科学综合
CiteScore
4.60
自引率
4.30%
发文量
120
审稿时长
4-8 weeks
期刊介绍: The International Journal of Earth Sciences publishes process-oriented original and review papers on the history of the earth, including - Dynamics of the lithosphere - Tectonics and volcanology - Sedimentology - Evolution of life - Marine and continental ecosystems - Global dynamics of physicochemical cycles - Mineral deposits and hydrocarbons - Surface processes.
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