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Control of the Paleogene sedimentary record of the Anglo-Paris Basin by both the Iceland mantle plume and the Massif Central hotspot
Proceedings of the Geologists' Association ( IF 1.2 ) Pub Date : 2020-08-13 , DOI: 10.1016/j.pgeola.2020.07.001
Andrew S. Gale , Bryan Lovell

We test here an earlier hypothesis of ours that the Massif Central hotspot, combined with the Iceland mantle plume, exercised first-order control of the Paleogene sedimentary record in the Anglo-Paris Basin. The Anglo-Paris Basin formed a southwestern arm of the Paleogene North Sea. Correlation of Paleogene depositional sequences across the North Sea Basin suggests that control of the sedimentary record in the Anglo-Paris Basin was exercised by both hotspots. The Cretaceous chalk in the basin was uplifted in two main episodes during the early and middle Paleocene. Also during the Paleocene, there was broadly synchronous vertical uplift of the unconformably underlying Mesozoic rocks on both the northwest and southeast flanks of the Anglo-Paris Basin. The resulting opposed regional dips are still obvious at the present day. This regional tilting of the Mesozoic into the Paleogene basin was caused by uplift by the early Iceland plume to the northwest, and by uplift associated with the inception of the early Massif Central hotspot to the southeast. Crustal shortening played a minor role in these hotspot-created vertical movements. In the Paleocene-early Eocene, high-frequency changes in relative regional sea-level in the Anglo-Paris Basin were controlled by apparently synchronous time-dependent behaviour of the Iceland and Massif Central hotspots. In contrast, from the early Eocene onwards, control of sea-level appears to have been exercised separately, with the two hotspots pulsing at different times.



中文翻译:

冰岛地幔柱和地块中部热点对盎格鲁-巴黎盆地古近纪沉积记录的控制

我们在这里检验我们的一个较早的假设,即Massif Central热点与冰岛地幔柱相结合,对盎格鲁-巴黎盆地的古近纪沉积记录进行了一级控制。盎格鲁-巴黎盆地形成了古近纪北海的西南分支。整个北海盆地古近纪沉积序列的相关性表明,两个热点都对盎格鲁-巴黎盆地的沉积记录进行了控制。在古新世的早期和中期,盆地中的白垩纪白垩岩在两个主要时期都被抬升。同样在古新世期间,盎格鲁-巴黎盆地西北和东南两侧的不整合面下的中生代岩石都出现了大致同步的垂直隆升。在今天,由此引起的对立区域下滑仍然很明显。中生代向古近纪盆地的这种区域性倾斜是由早期冰岛羽流向西北方向的隆升,以及与早期Massif Central热点向东南方向爆发相关的隆升引起的。在这些由热点产生的垂直运动中,地壳缩短起了很小的作用。在古新世-始新世,盎格鲁-巴黎盆地相对区域海平面的高频变化受冰岛和Massif中部热点的明显时间同步行为控制。相反,从始新世开始,海平面的控制似乎是分开进行的,两个热点在不同的时间脉动。以及与早期Massif Central热点向东南方向爆发有关的隆升。在这些由热点产生的垂直运动中,地壳缩短起了很小的作用。在古新世-始新世,盎格鲁-巴黎盆地相对区域海平面的高频变化受冰岛和Massif中部热点的明显时间同步行为控制。相反,从始新世开始,海平面的控制似乎是分开进行的,两个热点在不同的时间脉动。以及与早期Massif Central热点向东南方向爆发有关的隆升。在这些热点产生的垂直运动中,地壳缩短起了很小的作用。在古新世-始新世,盎格鲁-巴黎盆地相对区域海平面的高频变化受冰岛和Massif中部热点的明显时间同步行为控制。相反,从始新世开始,海平面的控制似乎是分开进行的,两个热点在不同的时间脉动。盎格鲁-巴黎盆地相对区域海平面的高频变化受冰岛和Massif中部热点的明显时间同步行为控制。相反,从始新世开始,海平面控制似乎是分开进行的,两个热点在不同的时间脉动。盎格鲁-巴黎盆地相对区域海平面的高频变化受冰岛和Massif中部热点的明显时间同步行为控制。相反,从始新世开始,海平面的控制似乎是分开进行的,两个热点在不同的时间脉动。

更新日期:2020-08-13
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