Abstract—

Isotope analyses of detrital zircons from the terrigenous sequences of the Neoarchean Uraguba–Titovka greenstone belt and the Paleoproterozoic Pechenga–Varzuga and Vetreny belts, including the basal conglomerates, by the SIMS (SHRIMP-II) and LA-ICP-MS methods were performed for the first time. On the basis of the data obtained, the inception dates of the structures and the ages and lithology of their basement rocks were established, and the origin of the terrigenous rocks was refined. Detrital zircon populations with ages of 2.66–2.73, 2.76–2.79, 2.82–2.87, and 2.98–3.00 Ga are predominant. The sources of these zircons were the rocks of the tonalite–trondhjemite–granodiorite complex, enderbites, high-alumina gneisses, and their metamorphosed varieties, which dominate the present-day erosion surface and have been penetrated by the Kola superdeep borehole. Zircon populations with the age of 3.00–3.70 Ga were also found. Zircon with the age of 3698 ± 8 Ga was found in terrigenous red beds, which mark the global Oxygen Revolution (2.2–2.3 Ga). Data obtained confirm a significant contribution of the Eoarchean and Paleoarchean material to continental crust composition in the region and the different inception dates of the Pechenga and Imandra–Varzuga structures.

中文翻译：

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基于碎屑锆石的同位素分析数据（SIMS，LA-ICP-MS），在芬诺斯坎迪亚盾的东部新古生界和古元古代古盆地的陆源层序碎屑物质的来源

摘要-

通过SIMS（SHRIMP-II）和LA-ICP-MS方法对新古拉格乌拉圭-蒂托夫卡绿岩带和古元古代佩城加-瓦祖加带和威特尼带（包括基底砾岩）的陆源层序中的碎屑锆石进行了同位素分析第一次。在获得的数据的基础上，确定了构造的起始日期，基底岩石的年龄和岩性，并完善了陆源岩的起源。占主导地位的碎屑锆石种群为2.66–2.73、2.76–2.79、2.82–2.87和2.98–3.00 Ga。这些锆石的来源是斜长石-长白云母-花岗岩闪长岩复合体的岩石、,石，高铝片麻岩及其变质的品种，它们在当今的侵蚀面中占主导地位，并已被可乐超深钻孔穿透。还发现了年龄为3.00–3.70 Ga的锆石种群。在陆源性红层中发现了年龄为3698±8 Ga的锆石，这标志着全球氧气革命（2.2–2.3 Ga）。所获得的数据证实，该地区的Eoarchean和Paleoarchean物质对大陆地壳成分以及Pechenga和Imandra-Varzuga结构的不同开始日期都有重要贡献。