Abstract The collision of intra-oceanic arcs with continental margins is a primary factor controlling the evolution, modification, and growth of continental crust. Syn- to post-collisional basins are formed on both the oceanic and continental sides of an accretionary orogen as a consequence of tectonic activity, which preserve the associated erosional and exhumation record of the colliding element. During the late Cretaceous–Paleogene, the evolution of the northern Colombian Andes was shaped by an oceanic arc-continent collision as a result of the interaction between the Caribbean and South American plates. The timing and stratigraphic record of the collision have mostly been reconstructed from foreland and hinterland basins. In this contribution, we present the results of an integrated stratigraphic, paleontological, and provenance study of Upper Cretaceous sedimentary sequences accumulated on the oceanic side, to the west of the collisional event. Our results suggest that clastic rocks mainly accumulated in short depositional systems in deep marine settings. Two stratigraphic units can be distinguished: A volcanoclastic unit, composed of dark gray siliceous mudrocks interlayed with thick to medium volcanic-rich sandstone layers, accumulated in a turbidite system . A siliciclastic unit (Urrao Member) composed of dark gray mudrocks, and thin to thick, fine- to medium-grained feldspathic litharenites and lithic arkoses accumulated in the lobes and splays of submarine fans. Polymictic conglomerates and sandstones associated with submarine channels and levees are less common and can be used as stratigraphic markers. The Urrao Member was mostly sourced from igneous, sedimentary, and metamorphic Cretaceous and older rocks forming the continental paleo-margin that was being rapidly exhumed as suggested in previous works. Zircon crystal morphology and depositional ages suggest volcanism simultaneous with sedimentation. The maximum depositional U Pb ages of zircons and poorly preserved macro- and microfossils (mollusks and calcareous microfossils) suggest a Coniacian and Campanian–Maastrichtian age for the volcanoclastic and siliciclastic units, respectively; nevertheless, regional paleontological and geochronological data indicate that marine siliciclastic sedimentation continued into the Paleocene. These new data suggest that the late Cretaceous–Paleocene interaction of the Caribbean and South American plates did not trigger considerable and long-lasting uplift/erosion of the colliding oceanic domain and that magmatism was active during collision.

中文翻译：

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哥伦比亚西北部安第斯山脉白垩纪-古新世弧-大陆碰撞的沉积记录：来自地层和来源限制的见解

摘要 洋内弧与大陆边缘的碰撞是控制大陆地壳演化、改造和生长的主要因素。由于构造活动，在增生造山带的海洋和大陆两侧形成了碰撞后盆地，这保留了碰撞元素的相关侵蚀和剥脱记录。在晚白垩世-古近纪，由于加勒比和南美板块相互作用，导致哥伦比亚安第斯山脉北部的演化是由大洋弧-大陆碰撞形成的。碰撞的时间和地层记录大多是从前陆盆地和内陆盆地重建的。在这篇文章中，我们展示了综合地层学、古生物学、碰撞事件以西洋侧堆积的上白垩统沉积层序和物源研究。我们的结果表明碎屑岩主要聚集在深海环境的短沉积系统中。可以区分两个地层单元： 火山碎屑单元，由深灰色硅质泥岩与厚至中等富含火山的砂岩层交错组成，堆积在浊积岩系统中。由深灰色泥岩和薄至厚、细至中粒长石岩屑岩和岩屑长石岩组成的硅质碎屑单元（Urrao 段），堆积在海底扇叶瓣和扇片中。与海底河道和堤防相关的混杂砾岩和砂岩不太常见，可用作地层标记。Urrao 段主要来自火成岩、沉积岩和变质的白垩纪和更古老的岩石，这些岩石形成了大陆古边缘，正如之前的工作所建议的那样，这些岩石正在被迅速挖掘。锆石晶体形态和沉积年龄表明火山作用与沉积作用同时发生。锆石和保存不佳的宏观和微观化石（软体动物和钙质微化石）的最大沉积 U Pb 年龄表明火山碎屑和硅质碎屑单元分别为圆锥形和坎帕期-马斯特里赫特时代；尽管如此，区域古生物学和地质年代学数据表明，海洋硅质碎屑沉积一直持续到古新世。