Abstract—

The results of petrographic, geochemical, and isotopic studies of the Neoproterozoic and Upper Paleozoic sandstones of the Eastern Taimyr complement the available data on their genesis and confirm their molassic origin. The sandstones and mudstones of the Neoproterozoic Stanovaya and Posadochnaya formations formed mostly from the erosion products of the magmatic and metamorphic complexes with ages of ~970–800 Ma and from older siliciclastic rocks. The Upper Paleozoic sandstones of the Byrranga, Sokolinaya, and Turuza formations are characterized by a somewhat lower degree of maturity. Most of them formed from erosion products of magmatic and metamorphic complexes with ages of ~500 and ~300 Ma, although sediments sourced from an older provenance were also encountered. The ages of the youngest detrital zircon grains from the Upper Paleozoic sandstones are close to the depositional ages in some cases and differ by more than 100 m.y. in other cases. This suggests that one should be cautious about using the maximum depositional ages for establishing the tectonic setting of sedimentary basin formation.

中文翻译：

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东泰米尔的新元古代和上古生界硅质碎屑岩的物源：岩石学，地球化学和地球年代学数据

摘要—

东泰米尔的新元古代和上古生界砂岩的岩石学，地球化学和同位素研究结果补充了其成因的可用数据，并证实了它们的糖浆成因。新元古代Stanovaya和Posadochnaya地层的砂岩和泥岩主要是由年龄约970-800 Ma的岩浆和变质复合体的侵蚀产物和较老的硅质碎屑岩形成的。Byrranga，Sokolinaya和Turuza地层的上古生代砂岩的成熟度较低。它们中的大多数是由岩浆和变质复合体的侵蚀产物形成的，年龄约为500至300 Ma，尽管也遇到了来自较早起源的沉积物。上古生界砂岩中最年轻的碎屑锆石颗粒的年龄在某些情况下接近沉积年龄，而在另一些情况下相差超过100 my。这表明人们应谨慎使用最大沉积年龄来建立沉积盆地形成的构造环境。