The combined effects of post‐rift magma emplacement and tectonic inversion on the hyper‐extended West Iberian Margin are unravelled in detail using multichannel 2D/3D seismic data. The Estremadura Spur, acting as an uplifted crustal block bounded by two first‐order transfer zones, shows evidence of four post‐rift tectonic events each with a distinctive seismic‐stratigraphic response that can be used to demonstrate the tectono‐magmatic interplay, namely: (a) the Campanian onset of magmatism (including the Fontanelas Volcano, the widespread evidence of multiple sill complexes and the detailed description of a >20 km long laccolith, the Estremadura Spur Intrusion; (b) the Campanian‐Maastrichtian NE‐SW event pervasively affecting the area, resulting in regional uplift, reverse faulting and folding; (c) the Paleocene‐mid Eocene inversion that resulted in widespread erosion and; (d) the Oligocene‐mid Miocene evidence of rejuvenated NW‐SE inversion marked by crestal faulting and forced‐fault folding establishing the final geometry of the area. The distinct deformation styles within each tectonic phase document a case of decoupled deformation between Late Cretaceous and Tertiary units, in response to the predominant stress field evolution, revealing that the magnitude of Late Cretaceous inversion is far more significant than the one affecting the latter units. A detailed analysis of the laccolith and its overburden demonstrate the distinct deformation patterns associated both with magma ascent (including extensional faulting, forced‐folding and concentric reverse faulting) and its interference as a rigid intrusive body during subsequent transpressive inversion. This reinforces the role that the combined tectono‐magmatic events played on the margin. Also analysed is the wider impact of post‐rift magmatism and the associate emplacement of sub‐lithospheric magma on the rheology of a thinned continental crust. This takes into account the simultaneous tectonic inversion of the margin, the implied alternative views on characteristic heat flow, and on how these can be incorporated in source rock organic maturity modelling.

中文翻译：

---

西伊比利亚中缘（Estremadura Spur）裂谷后反演期间构造和岩浆作用的相互作用

使用多通道2D / 3D地震数据，详细揭示了裂谷后岩浆位置和构造反转对超伸展的西伊比利亚边缘的综合影响。埃斯特雷马杜拉马刺（Estremadura Spur）是由两个一级传递带界定的隆升地块，显示了四个裂谷后构造事件的证据，每个事件都具有独特的地震地层反应，可以用来说明构造-岩浆相互作用，即： （a）坎帕尼亚岩浆爆发（包括丰塔内拉斯火山​​，广泛的门槛复合体证据和20多公里长的漆岩详细描述，埃斯特雷马杜拉山刺侵入）;（b）坎帕尼亚-马斯特里赫特NE-SW事件无处不在影响该地区，导致区域隆起，反向断裂和褶皱；（c）导致新世广泛侵蚀的古新世-中始新世反转; （d）渐新世-中新世新生代NW-SE反转的证据，其特征是地壳断层和强迫断层折叠建立了该区域的最终几何形状。在每个构造相中不同的变形方式记录了晚白垩世和第三纪单元之间解耦变形的情况，以响应主要的应力场演化，这表明晚白垩世反演的幅度远比影响后白垩纪的大。对漆岩及其上覆岩层的详细分析表明，岩浆上升（包括伸展断层，强迫褶皱和同心逆断层）及其在随后的反压转过程中作为刚性侵入体的干扰。这加强了合并的构造-岩浆事件在边缘上所发挥的作用。还分析了裂谷后岩浆作用和副岩浆下岩浆对更薄的大陆壳流变学的更广泛影响。这考虑到了边际的构造逆转，关于特征热流的隐含替代观点，以及如何将这些观点整合到烃源岩有机成熟度模型中。还分析了裂谷后岩浆作用和副岩浆下岩浆对更薄的大陆壳流变学的更广泛影响。这考虑到了边际的构造逆转，关于特征热流的隐含替代观点，以及如何将这些观点整合到烃源岩有机成熟度模型中。还分析了裂谷后岩浆作用和副岩浆下岩浆对更薄的大陆壳流变学的更广泛影响。这考虑到了边际的构造逆转，关于特征热流的隐含替代观点，以及如何将这些观点整合到烃源岩有机成熟度模型中。