Evolution of contourite systems in the late Cretaceous Chalk Sea along the Tornquist Zone
Evolution of contourite systems in the late Cretaceous Chalk Sea along the Tornquist Zone
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托恩奎斯特带晚白垩世白垩海等深岩系统的演化
DOI：
10.1111/sed.12564
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发表时间：
2019
期刊：
影响因子：
3.5
通讯作者：
Christian
中科院分区：
文献类型：
--
作者：
Hübscher;Christian;Hseinat;Mu'ayyad Al;Schneider;Matthias;Betzler;Christian
基于地震反射和钻井资料分析的整合，本研究探讨了在晚白垩世在波罗的海南部发育的两个主要的等深流体系。这些白垩海等深流系统之间的卡特加特海峡和波罗的海南部的演变开始时，Turonian到Campanian反转构造叠加在相当平坦的浅海白垩海海底。托恩奎斯特区和邻近的较小地块被抬升，形成了影响底层洋流的细长障碍物。由于反转，托恩奎斯特区以西的海底向东北倾斜，形成了一个不对称的子盆地，东北部有一个陡峭的边缘斜坡，西南部有一个平缓的斜坡。沿西南盆地边缘沿着科尼亚阶或桑托阶出现东南向等深流，形成等深水道和漂积物。先前研究的Stevns Klint近海等深流系统是该系统的一部分。第二个，更深和西北方向的逆流出现沿着和平行于托恩奎斯特区在后期坎帕尼亚，但最强的马斯特里赫特。这种底部电流缓和了邻近高架托恩奎斯特区的漂移护城河系统的演变。斯堪尼亚的近地表阿尔纳普山谷代表了连接波美拉尼亚湾和卡特加特海峡的丹尼古护城河。先前研究的卡特加特等深岩系统代表了该系统的西北延伸。这项研究将卡特加特海峡和海上Stevns Klint的先前观测结果与这里推断的两个海流联系起来，一个是更浅的东南向海流，另一个是更深的西北向海流。
Based on integration of seismic reflection and well data analysis this study examines two major contourite systems that developed during the late Cretaceous in the southern Baltic Sea. The evolution of these Chalk Sea contourite systems between the Kattegat and the southern Baltic Sea started when Turonian to Campanian inversion tectonics overprinted the rather flat sea floor of the epeiric Chalk Sea. The Tornquist Zone and adjacent smaller blocks were uplifted and formed elongated obstacles that influenced the bottom currents. As a consequence of the inversion, the sea floor west of the Tornquist Zone tilted towards the north‐east, creating an asymmetrical sub‐basin with a steep marginal slope in the north‐east and a gentle dipping slope in the south‐west. A south‐east directed contour current emerged in the Coniacian or Santonian along the south‐western basin margin, creating contourite channels and drifts. The previously studied contourite system offshore Stevns Klint is part of this system. A second, deeper and north‐west directed counter‐flow emerged along and parallel to the Tornquist Zone in the later Campanian, but was strongest in the Maastrichtian. This bottom current moderated the evolution of a drift‐moat system adjacent to the elevated Tornquist Zone. The near surface Alnarp Valley in Scania represents the Danian palaeo‐moat that linked the Pomeranian Bay with the Kattegat. The previously studied contourite system in the Kattegat represents the north‐western prolongation of this system. This study links previous observations from the Kattegat and offshore Stevns Klint to the here inferred two currents, a more shallow, south‐east directed and a deeper, north‐west directed flow.
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