Abstract Subduction erosion is a long-term, large-scale geological process that dominates the structural inventory of a large number of convergent margins. Along the Peruvian convergent margin, this process has controlled the structural deformation of the forearc as a consequence of spatio-temporal variations during the Cenozoic. However, the pace at which tectonic erosion occurred has not been linked to regional, subduction-related events. The aim of this study is to show that subduction erosion along the Central Peruvian convergent margin off Trujillo (7∘S–9∘S) was influenced by plate convergence variability since the Late Cretaceous. Drilling data, multi-channel seismic (MCS) data and subsidence analyses are used to investigate the long-term effect of subduction erosion on the tectonic evolution of the Peru margin. Our study shows that subduction erosion (1) did not occur between the Cretaceous and Early Eocene (110–56 Ma), (2) increased and fluctuated between the Eocene and Pliocene (56–5 Ma) with a maximum average trench retreat of 3 km.Myr−1 between the Middle Miocene and Late Miocene (20–5 Ma), and (3) has decreased since the Pliocene (5 Ma) (1 km.Myr−1 of average trench retreat). A remarkable finding is that shorter periods of faster subduction erosion coincide with or follow major plate reorganization events that were marked by changes in the velocity and direction of relative plate convergence as well as with well-known phases of Andean orogeny. Based on our analyses, we therefore conclude that convergence variability off Peru is a primary mechanism controlling the pace at which tectonic erosion occurred along the Trujillo Basin during the Cenozoic.

中文翻译：

---

秘鲁特鲁希略附近会聚边缘的板块会聚变异期间，新生代俯冲侵蚀增加

摘要 俯冲侵蚀是一种长期的、大规模的地质过程，主导着大量收敛边缘的构造存量。沿着秘鲁会聚边缘，这一过程控制了前弧的结构变形，这是新生代时空变化的结果。然而，构造侵蚀发生的速度与区域性俯冲相关事件无关。本研究的目的是表明，自晚白垩世以来，沿着秘鲁中部会聚边缘（7∘S–9∘S）的俯冲侵蚀受到板块会聚变异性的影响。钻井数据、多道地震 (MCS) 数据和沉降分析用于研究俯冲侵蚀对秘鲁边缘构造演化的长期影响。我们的研究表明俯冲侵蚀（1）在白垩纪和早始新世（110-56 Ma）之间没有发生，（2）在始新世和上新世（56-5 Ma）之间增加和波动，最大平均海沟撤退为 3中中新世和晚中新世（20-5 Ma）之间的 km.Myr-1 和（3）自上新世（5 Ma）（平均海沟撤退 1 km.Myr-1）以来已经减少。一个显着的发现是，较快的俯冲侵蚀的较短时期与主要板块重组事件同时发生或紧随其后，这些事件以板块相对收敛速度和方向的变化以及众所周知的安第斯造山运动阶段为标志。因此，根据我们的分析，我们得出结论，秘鲁附近的辐合变异性是控制新生代沿特鲁希略盆地构造侵蚀发生速度的主要机制。