Abstract

The U–Pb (LA-ICP-MS) dating of detrital zircons from the Upper Cretaceous Derevyannye Gory Formation in the Novaya Sibir Island revealed that tuffites and tuffaceous sandstones contain zircons widely ranging in age from Archean to Upper Cretaceous. The weighted average age of the youngest zircon population is 88 ± 1.0 Ma, which constrains the lower age limit for sedimentation of the Derevyannye Gory Formation to the Coniacian. The clastic material was transported from the southwest and south to the north and northeast. The main source areas for the Upper Cretaceous sedimentary basin in the Novaya Sibir Island were the Upper Jurassic–Neocomian terrigenous sequences of the New Siberian–Chukotka fold area, lithotectonic complexes of the South Anyui suture, as well as the northern part of the Verkhoyansk–Kolyma fold area, and post-orogenic Aptian–Albian volcanic and plutonic rocks from the Lyakhov Islands and Svyatoi Nos Cape. Triassic terrigenous rocks of the northern Verkhoyansk region could serve as additional sources of clastics. It is also possible that the clastic material was partially supplied from the western Anjou Islands as a result of erosion of the Aptian–Lower Albian volcaniclastic–siliciclastic rocks. The Late Cretaceous zircon population is related to the Late Cretaceous explosive acid volcanism in the eastern Arctic region.

中文翻译：

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新西伯利亚岛（新西伯利亚群岛，安茹岛群）上白垩统沉积物碎屑锆石的 U/Pb 测年结果

摘要

Novaya Sibir 岛上白垩统 Derevyannye Gory 组碎屑锆石的 U-Pb (LA-ICP-MS) 测年表明，凝灰岩和凝灰质砂岩中的锆石年龄范围从太古宙到上白垩统不等。最年轻锆石群的加权平均年龄为 88 ± 1.0 Ma，这限制了 Derevyannye Gory 组沉积到科尼亚克阶的年龄下限。碎屑物质由西南、南向北、东北输送。新西伯利亚岛上白垩统沉积盆地的主要源区是新西伯利亚-楚科奇褶皱区的上侏罗统-新科统陆源层序、南安伊缝合带的岩石构造杂岩以及维尔霍扬斯克北部-科雷马褶皱区，以及来自 Lyakhov 群岛和 Svyatoi Nos Cape 的后造山带 Aptian-Albian 火山岩和深成岩。Verkhoyansk 地区北部的三叠纪陆源岩石可以作为碎屑的额外来源。由于阿普蒂安-下阿尔比火山碎屑岩-硅质碎屑岩的侵蚀，碎屑物质也可能部分来自安茹群岛西部。晚白垩世锆石种群与北极东部地区晚白垩世爆发酸性火山作用有关。由于阿普蒂安-下阿尔比火山碎屑岩-硅质碎屑岩的侵蚀，碎屑物质也可能部分来自安茹群岛西部。晚白垩世锆石种群与北极东部地区晚白垩世爆发酸性火山作用有关。由于阿普蒂安-下阿尔比火山碎屑岩-硅质碎屑岩的侵蚀，碎屑物质也可能部分来自安茹群岛西部。晚白垩世锆石种群与北极东部地区晚白垩世爆发酸性火山作用有关。