High-resolution cyclostratigraphy in growth strata are used to reconstruct unsteady folding rates at the regional-scale Pico del Aguila anticline, southern Pyrenees, to evaluate deformation modulation. Magnetic polarity stratigraphy was used to calibrate cyclostratigraphy-based anhysteretic remanent magnetization intensity variations to establish precessional frequencies in the growth strata record. The astronomically tuning was used to determine sedimentation rates and absolute time. Incremental tilting rates were calculated between selected horizons over ∼6 myr of fold growth. Careful treatment of uncertainties enhances confidence that the results are meaningful and results show significant variability in folding rates over time. The acceleration phase of fold growth was variable, punctuated by a prolonged period of tectonic quiescence, and correlated to sedimentation changes in the wedge-top basin. Low dipping bedding intrinsically modulated the initial rates of folding for the first 25° of limb tilt, until ∼38.86 Ma. Then, halotectonics in the Paleogene Jaca Basin extrinsically modulated accelerating folding rates for the next 45° of limb tilting, until ∼37.42 Ma. Finally, forelimb-steepening leading to geometric strain hardening and blunted folding rates for the last 17° of fold tightening and causing a thrust fault to cut the anticline's core. Folding ended at Pico del Aguila ∼35.10 Ma. Calculated folding rates varied between 0° ± 5.5°and 90° ± 19°/myr over 100s kyr time increments. Variations in the folding rate of the Pico del Aguila décollement anticline are attributed to both intrinsic modulation as a result of progressive bedding steepening during folding and extrinsic modulation as a result of variable deltaic sedimentation rates in the wedge-top basin.

中文翻译：

---

西班牙 Pico del Aguila 增长层的 104 至 105 年时间分辨率的折叠率的内部和外部调制

生长地层中的高分辨率旋回地层学用于重建比利牛斯山脉南部地区尺度 Pico del Aguila 背斜的不稳定折叠率，以评估变形调制。磁极性地层学用于校准基于循环地层学的非滞后剩磁强度变化，以在生长地层记录中建立进动频率。天文调谐用于确定沉降速率和绝对时间。增量倾斜率是在选定的层级之间计算的，超过 6 米的折叠增长。仔细处理不确定性可增强对结果有意义的信心，并且结果显示折叠率随时间的显着变化。褶皱生长的加速阶段是可变的，被长时间的构造静止打断，并与楔顶盆地的沉积变化相关。低倾斜层理本质上调节了肢体倾斜的前 25° 的初始折叠速率，直到 ~38.86 Ma。然后，古近纪哈卡盆地的盐酸盐构造外在地调节了下一个 45° 的肢体倾斜的加速折叠率，直到 ~37.42 Ma。最后，前肢陡峭导致几何应变硬化和折叠收紧的最后 17° 的钝化率，并导致逆向断层切割背斜的核心。折叠结束于 Pico del Aguila ∼35.10 Ma。计算的折叠率在 0° ± 5.5° 和 90° ± 19°/myr 之间变化，超过 100 秒 kyr 时间增量。