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Eocene post-rift tectonostratigraphy of the Rockall Plateau, Atlantic margin of NW Britain : linking early spreading tectonics and passive margin response

机译:英国西北部大西洋边缘Rockall高原的始新世裂谷构造地层学:将早期扩张构造与被动边缘响应联系起来

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摘要

A regional study of the Eocene succession in the UK sector of the Rockall Plateau has yielded new insights into the early opening history of the NE Atlantic continental margin. Data acquired from British Geological Survey borehole 94/3, on the Rockall High, provides a high-resolution record of post-rift, Early to Mid-Eocene, subaqueous fan-delta development and sporadic volcanic activity, represented by pillow lavas, tuffs and subaerial lavas. This sequence correlates with the East Rockall Wedge, which is one of several prograding sediment wedges identified across the Rockall Plateau whose development was largely terminated in the mid-Lutetian. Linking the biostratigraphical data with the magnetic anomaly pattern in the adjacent ocean basin indicates that this switch-off in fan-delta sedimentation and volcanism was coincident with the change from a segmented/transform margin to a continuously spreading margin during chron C21. However, late-stage easterly prograding sediment wedges developed on the Hatton High during late Mid- to Late Eocene times; these can only have been sourced from the Hatton High, which was developing as an anticline during this interval. This deformation occurred in response to Mid- to Late Eocene compression along the ocean margin, possibly associated with the reorganisation to oblique spreading in the Iceland Basin, which culminated at the end of the Eocene with the formation of the North Hatton Anticline, and the deformation (tilting) of these wedges. A series of intra-Eocene unconformities, of which the mid-Lutetian unconformity is the best example, has been traced from the Rockall Plateau to the Faroe–Shetland region and onto the Greenland conjugate margin bordering the early ocean basin. Whilst there appears to be some correlation with 3rd order changes in eustatic sea level, it is clear from this study that tectonomagmatic processes related to changes in spreading directions between Greenland and Eurasia, and/or mantle thermal perturbations cannot be discounted.
机译:洛克洛克高原英国地区始新世演替的区域研究对东北大西洋大陆边缘的早期开放历史产生了新的见解。从Rockall High上的英国地质调查局94/3钻孔获得的数据提供了裂谷后,早始至中新世,水下扇三角洲发育和零星火山活动的高分辨率记录,其表现为枕状熔岩,凝灰岩和地下熔岩。该序列与东洛卡楔相吻合,东洛卡楔是在洛卡特高原上发现的几个渐进的沉积楔之一,其发育在卢特西亚中期被终止。将生物地层学数据与邻近海盆的磁异常模式联系起来,表明扇三角洲沉积和火山活动的这种关闭与在C21年代从分段/转换边缘向连续扩展边缘的变化是一致的。然而,在始新世中期至晚晚期,在哈顿高地上出现了晚期向东扩展的沉积楔形。这些只能来自哈顿高地,而哈顿高地在这段时间里正发展为背斜。这种变形是响应始新世中期至晚期沿海缘的压缩而发生的,这可能与冰岛盆地向斜展布的重组有关,后者在始新世末期达到顶峰,并形成了北哈顿背斜。 (倾斜)这些楔子。从洛克洛克高原到法罗–设得兰群岛地区,再到与早期海盆接壤的格陵兰共轭边缘,可以追溯到一系列始新世内部的不整合面,其中以鲁特山中期的不整合面为最佳例子。虽然与欢乐海平面的三阶变化似乎存在一定的相关性,但从这项研究中可以明显看出,与格陵兰岛和欧亚大陆之间的传播方向变化和/或地幔热扰动有关的构造学过程。

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