Abstract. Recognition of new angular unconformity and synthesizing of new detrital zircon U-Pb and (U-Th)/He provenance records, including zircon (U-Th)/(He-Pb) double dating, from the NW Zagros elucidate the basin dynamics of the foreland wedge-top and intermontane units, as well as the tectonic processes in the source terranes in response to different geodynamic phases. In this contribution, we present field observations and detrital zircon provenance data from hinterland basins to reconstruct the basin dynamics and the underlying tectonic controls in the NW Zagros in the Kurdistan region of Iraq. Results reveal that the deposition of the suture zone units of the Red Beds Series (RBS; Suwais Group, Govanda Formation, Merga Group) occurred in an intermontane basin on top of folded Upper Cretaceous units with an angular unconformity. The RBS provenance data point at the Paleogene Walash-Naopurdan-Kamyaran (WNK) arc-related complex as a source area and show substantial decrease of magmatism by ~ 36 Ma, as reflected by the youngest ages peaks. New detrital zircon provenance data from the hinterland wedge-top units of the proto-Zagros foreland basin (the Tanjero, Kolosh, and Gercus Formations) exhibit exclusive derivation from the Upper Cretaceous Neotethys ophiolitic terranes, different from the provenance of the older Lower Cretaceous and Paleozoic units that are dominated by the Paleozoic and Neoproterozoic age spectra. These shifts in provenance between different tectonostratigraphic units argue for sediment route reversal from E to W in response to ophiolite obduction, arrival of the WNK complex and commencement of the continental collision during the late Eocene, followed by deposition of the RBS in the hinterland of the proto-Zagros fold-thrust belt, and paleodrainage connection with the post-collisional Neogene foreland basin.

中文翻译：

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从新特提斯引诱带到阿拉伯-欧亚大陆碰撞，西北Zagros褶皱冲断带，伊拉克库尔德斯坦地区的Zagros山区建筑的碎屑锆石物源记录

摘要。识别新的角度不整合面并合成新的碎屑锆石U-Pb和（U-Th）/ He物源记录，包括来自西北Zagros的锆石（U-Th）/（He-Pb）双重年代学，阐明了前陆楔顶单元和山间单元，以及源陆中的构造过程响应于不同的地球动力学阶段。在此贡献中，我们提供了来自内陆盆地的野外观测资料和碎屑锆石物产数据，以重建伊拉克库尔德地区西北Zagros的盆地动力学和潜在的构造控制。结果表明，红色层系缝合线单元（RBS； Suwais组，Govanda组，Merga组）的缝合带沉积发生在上白垩统单元顶部的山间盆地中，其成角度不整合面。RBS起源数据点位于古近系Walash-Naopurdan-Kamyaran（WNK）弧相关复合体作为震源区，并显示岩浆活动大幅度减少了约36 Ma，这是由最年轻的年龄峰反映出来的。来自原始扎格罗斯前陆盆地内陆楔顶单元的新碎屑锆石物源数据（Tanjero，Kolosh和Gercus地层）显示出上白垩统新特提斯蛇绿岩地层的独家推导，与较旧的下白垩统和下白垩统的起源不同以古生代和新元古代年龄谱为主的古生代单位。不同构造地层单位之间物源的这些变化表明，由于蛇绿岩的引诱，WNK复合体的到来以及始新世晚期陆相碰撞的开始，沉积物路线从E向W反转。