Replication Data for: Cenozoic stages of forearc evolution following the accretion of a sliver from the Late Cretaceous-Caribbean Large Igneous Province (CLIP): SW Ecuador-NW Peru

The dataset include 2D seismic profiles and well log data from the Gulf of Guayaquil-Tumbes basin, SW Ecuador-NW Peru, used in the article: Cenozoic stages of forearc evolution following the accretion of a sliver from the Late Cretaceous-Caribbean Large Igneous Province (CLIP): SW Ecuador-NW Peru. The SW Ecuador-NW Peru forearc region is the southernmost location, where the Caribbean Large Igneous Province (CLIP) interacted with the South American margin since the Late Cretaceous. The accretion of the CLIP to the margin led to the entrapment of the North Andean crustal Sliver, conforming the underlying basement of the forearc region in Ecuador, whereas in NW Peru, forearc depocenters involve rocks of continental affinity. Many existing tectonic reconstructions have treated these two areas independently, largely based on their crustal affinities. In contrast, this study integrates previous studies into an analysis of unpublished seismic profiles, potential field data, outcrop stratigraphy, and recent studies dealing with the dynamics of allochthonous terrane accretion along continental margins. Our integrated approach shows that SW Ecuador was dominated by a Late Cretaceous deforming outer wedge, which may have constituted a remnant of a northeast or northwest-dipping obliquely obducted oceanic block at the edge of the CLIP. This tectonic phase was governed by plate instability, affecting NW Peru and SW Ecuador, followed by re-establishment of the margin by early Eocene. The resulting margin configuration and the spatial distribution of the different tectonic elements seems to have played a key role on further Cenozoic development of the forearc region. The model presented in this study proposes that the accretion of buoyant oceanic terranes may have had a profound impact on the early margin configuration of SW Ecuador and NW Peru and led to the development of localized but genetically related forearc depocenters.

本数据集包含采自厄瓜多尔西南部-秘鲁西北部瓜亚基尔-通贝斯湾盆地的二维地震剖面与测井数据，相关研究论文为《白垩纪晚期加勒比大火成岩省（Caribbean Large Igneous Province, CLIP）地体增生后的弧前演化新生代阶段：厄瓜多尔西南部-秘鲁西北部》。厄瓜多尔西南部-秘鲁西北部弧前区域是白垩纪晚期以来加勒比大火成岩省（CLIP）与南美大陆边缘相互作用的最南端区域。加勒比大火成岩省向大陆边缘的增生作用导致北安第斯地壳地体被捕获，成为厄瓜多尔弧前区域的基底岩石；而在秘鲁西北部，弧前沉积中心发育具有大陆亲缘属性的岩石。现有诸多构造重建研究大多基于两地的地壳属性差异，将其作为独立区域分别开展研究。与之不同，本研究整合既往研究成果，对未公开地震剖面、位场数据、露头地层以及近期关于大陆边缘异地地体增生动力学的相关研究进行了综合分析。本综合研究表明，厄瓜多尔西南部以白垩纪晚期变形外楔为主，该构造可能是加勒比大火成岩省边缘向东北或西北倾斜的斜仰冲洋壳地块的残余体。该构造阶段受板块不稳定性控制，影响范围覆盖秘鲁西北部与厄瓜多尔西南部，随后在早始新世时期大陆边缘得以重建。最终形成的大陆边缘构型与不同构造要素的空间分布，对该弧前区域后续的新生代演化起到了关键作用。本研究提出的模型认为，低密度洋壳地体的增生作用对厄瓜多尔西南部与秘鲁西北部的早期大陆边缘构型产生了深远影响，并促成了局部分布但成因相关的弧前沉积中心的形成。