Inversion, reactivated faults and related structures: seismic examples from the southern North Sea
Inversion, reactivated faults and related structures: seismic examples from the southern North Sea
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反转、重新活动的断层和相关构造：来自北海南部的地震实例
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
L. C. Backshall
中科院分区：
文献类型：
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作者：
M. Badley;J. Price;L. C. Backshall
摘要 本研究研究了 UKCS 近海象限 53/54 中反演特征的几何形状和时间。研究区域位于 Zechstein 盐盆地以南，主要由两个主要且持续存在的构造要素控制，即威尔士-布拉班特地块（位于该区域的西南部）和南休伊特断层（位于该区域的中心）。威尔士-布拉班特地块是一个稳定的基底块，其北侧是一个倒置的三叠纪盆地。这个三叠纪盆地又形成了南休伊特断层的下盘地块。南休伊特断层的东北方向和局部西南方向存在一系列侏罗纪倾斜断块，这些断块对称地分布在中央“基石”周围。这些中心块不包含同延伸沉积物填充，被解释为寄生在由底层热异常产生的大波长隆起上的外弧延伸结构。威尔士-布拉班特地块东北部的所有主要构造特征在白垩纪晚期都发生了反转。这种反转在更深的基底断层上方的盖层岩石中产生了强制褶皱，并在早期旋转半地堑的位置产生了鱼叉形结构。该解释考虑了白垩纪晚期反转和随后的中新世反转时期对早期伸展结构的影响。
Summary This study examines the geometry and timing of inversion features in offshore Quadrants 53/54 of the UKCS. The area studied lies south of the Zechstein salt basin and is dominated by two major and temporally-persistent structural elements, the Wales-Brabant Massif (in the SW of the area) and the South Hewett Fault (in the centre of the area). The Wales-Brabant Massif is a stable basement block, flanked to the north by an inverted Triassic basin. This Triassic basin in turn forms the footwall block to the South Hewett Fault. NE, and locally SW, of the South Hewett Fault lies a series of Jurassic tilted fault blocks symmetrically disposed about a central ‘keystone’. These central blocks contain no synextension sediment fill and are interpreted as outer-arc extensional structures parasitic on a large wavelength uplift produced by an underlying thermal anomaly. All major structural features lying to the NE of the Wales-Brabant Massif were inverted during the late Cretaceous. This inversion produced forced folds in the cover rocks above deeper basement faults, and harpoon-shaped structures at the sites of earlier rotational half-grabens. This account considers the effects of both this late Cretaceous inversion and a succeeding period of inversion during the Miocene on earlier extensional structures.