The Proterozoic evolution of northern Siberian Craton margin: a comparison of U–Pb–Hf signatures from sedimentary units of the Taimyr orogenic belt and the Siberian platform

Identifying the cratonic affinity of Neoproterozoic crust that surrounds the northern margin of the Siberian Craton (SC) is critical for determining its tectonic evolution and placing the Craton in Neoproterozoic supercontinental reconstructions. Integration of new U–Pb–Hf detrital zircon data with regional geological constraints indicates that distinct Neoproterozoic arc-related magmatic belts can be identified within the Taimyr orogen. Sedimentary rocks derived from 970 to 800 Ma arc-related suites reveal abundant Archean and Paleoproterozoic detritus, characteristic of the SC. The 720–600 Ma arc-related zircon population from the younger Cambrian sedimentary rocks is also complemented by an exotic juvenile Mesoproterozoic zircon population and erosional products of older arc-related suites. Nonetheless, numerous evidences imply that both arcs broadly reworked Siberian basement components. We suggest that the early Neoproterozoic (ca. 970–800 Ma) arc system of the Taimyr orogen evolved on the active margin of the SC and probably extended along the periphery of Rodinia into Valhalla orogen of NE Laurentia. We also suggest the late Neoproterozoic (750–550 Ma) arc system could have been part of the Timanian orogen, which linked Siberia and Baltica at the Precambrian/Phanerozoic transition.

明确环绕西伯利亚克拉通（Siberian Craton, SC）北缘的新元古代地壳的克拉通亲缘属性，对厘清该克拉通的构造演化历程，以及将其纳入新元古代超大陆重建模型均具有关键意义。结合新获得的U-Pb-Hf碎屑锆石数据与区域地质约束条件，研究表明泰梅尔造山带内可识别出特征鲜明的新元古代弧相关岩浆带。源自970~800 Ma弧相关岩系的沉积岩中，赋存大量太古代与古元古代碎屑物质，这一特征与西伯利亚克拉通的物质组成一致。来自较年轻寒武纪沉积岩的720~600 Ma弧相关锆石群体，同时伴随有外来新生中元古代锆石群体以及早期弧相关岩系的侵蚀产物。尽管如此，诸多证据显示这两条弧带均广泛改造了西伯利亚基底组分。我们提出，泰梅尔造山带的早新元古代（约970~800 Ma）弧系统形成于西伯利亚克拉通的活动大陆边缘，并可能沿罗迪尼亚超大陆的外围延伸至劳伦大陆东北部的瓦尔哈拉造山带。我们同时认为，晚新元古代（750~550 Ma）的弧系统可能属于蒂曼造山带的一部分，该造山带在前寒武纪-显生宙过渡阶段连接了西伯利亚与波罗的大陆。