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Controls on the Stratigraphic Architecture of the US Atlantic Margin: Processes Forming the Accommodation Space
Journal of Geophysical Research: Solid Earth ( IF 3.9 ) Pub Date : 2024-10-11 , DOI: 10.1029/2024jb028713 G. Lang, U. S. ten Brink, D. R. Hutchinson, G. S. Mountain, U. Schattner
Journal of Geophysical Research: Solid Earth ( IF 3.9 ) Pub Date : 2024-10-11 , DOI: 10.1029/2024jb028713 G. Lang, U. S. ten Brink, D. R. Hutchinson, G. S. Mountain, U. Schattner
Accommodation space governs the spatial and temporal distributions of sediments in continental margins. Mapping the sedimentation patterns, therefore, offers insights into the solid-Earth processes that shape accommodation space. We assembled an unprecedented amount of seismic and borehole data along the Eastern North American Margin and used it to divide the margin's sedimentary package into eight chronostratigraphic intervals, identifying temporal shifts in depocenters under the continental shelf, slope, and rise. The Jurassic depocenters follow the syn-rift structure and its thermal subsidence loci. The Long Island Platform is the only margin segment where the early post-rift sediment thickness matches subsidence predictions from uniform-stretching models, whereas in Georges Bank Basin (GBB) and Baltimore Canyon Trough (BCT), sediment thickness is 1.5–3 times higher than predicted, pointing to other factors at play. A margin-wide Jurassic transient shoulder uplift is inferred from the occurrence of stratigraphic onlaps above thinned crust. Unlike the Jurassic, the Cretaceous and Cenozoic depocenters disregard the inherited subsidence pattern. The accommodation space over the shelf and coastal plain during the Cretaceous was affected by regional isostatic compensation of the sedimentary loads accumulated on the shelf and rise. Accommodation space development in the GBB was interrupted during the Cretaceous after the margin crossed the Great Meteor Hotspot track, resulting in a widespread permanent uplift, erosion, and sediment redistribution. The distribution of anomalous Neogene subsidence in the BCT challenges previous suggestions of mantle dynamic control on the accommodation space and favors flexural downwarping of the shelf by sediment accumulation on the rise.
中文翻译:
对美国大西洋边缘地层结构的控制:形成住宿空间的过程
住宿空间控制着大陆边缘沉积物的时空分布。因此,绘制沉积模式图有助于深入了解塑造住宿空间的固体地球过程。我们沿着北美东部边缘收集了前所未有的大量地震和钻孔数据,并使用它来将边缘的沉积物包划分为八个年代地层间隔,确定了大陆架、斜坡和隆起下沉积中心的时间变化。侏罗纪沉积中心遵循 syn-rift 结构及其热沉降位点。长岛平台是唯一一个裂谷后早期沉积物厚度与均匀拉伸模型预测的沉降相匹配的边缘段,而在乔治班克盆地 (GBB) 和巴尔的摩峡谷海槽 (BCT) 中,沉积物厚度比预测高 1.5-3 倍,这表明还有其他因素在起作用。从变薄的地壳上方的地层重叠的出现推断出边缘范围的侏罗纪瞬态肩部隆起。与侏罗纪不同,白垩纪和新生代沉积中心忽略了遗传的沉降模式。白垩纪大陆架和沿海平原上的居住空间受到大陆架上积累的沉积载荷的区域等静压补偿的影响。在白垩纪,当边缘穿过大流星热点路径后,GBB 的住宿空间开发被中断,导致广泛的永久性隆起、侵蚀和沉积物重新分布。BCT 中异常新近纪沉降的分布挑战了以前关于地幔动态控制对住宿空间的建议,并支持沉积物积累上升导致大陆架的弯曲下翘。
更新日期:2024-10-11
中文翻译:
对美国大西洋边缘地层结构的控制:形成住宿空间的过程
住宿空间控制着大陆边缘沉积物的时空分布。因此,绘制沉积模式图有助于深入了解塑造住宿空间的固体地球过程。我们沿着北美东部边缘收集了前所未有的大量地震和钻孔数据,并使用它来将边缘的沉积物包划分为八个年代地层间隔,确定了大陆架、斜坡和隆起下沉积中心的时间变化。侏罗纪沉积中心遵循 syn-rift 结构及其热沉降位点。长岛平台是唯一一个裂谷后早期沉积物厚度与均匀拉伸模型预测的沉降相匹配的边缘段,而在乔治班克盆地 (GBB) 和巴尔的摩峡谷海槽 (BCT) 中,沉积物厚度比预测高 1.5-3 倍,这表明还有其他因素在起作用。从变薄的地壳上方的地层重叠的出现推断出边缘范围的侏罗纪瞬态肩部隆起。与侏罗纪不同,白垩纪和新生代沉积中心忽略了遗传的沉降模式。白垩纪大陆架和沿海平原上的居住空间受到大陆架上积累的沉积载荷的区域等静压补偿的影响。在白垩纪,当边缘穿过大流星热点路径后,GBB 的住宿空间开发被中断,导致广泛的永久性隆起、侵蚀和沉积物重新分布。BCT 中异常新近纪沉降的分布挑战了以前关于地幔动态控制对住宿空间的建议,并支持沉积物积累上升导致大陆架的弯曲下翘。