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Tectonic Nature of the Ul’ban Terrane (Mongol–Okhotsk Fold Belt): Results of U–Pb and Lu–Hf Isotope Studies of Detrital Zircons
Doklady Earth Sciences ( IF 0.9 ) Pub Date : 2020-05-01 , DOI: 10.1134/s1028334x20050232
V. A. Zaika , A. A. Sorokin

Abstract The U–Pb and Lu–Hf isotope studies of detrital zircons from Mesozoic metasedimentary rocks of the Sorukan and Naldinda formations of the Ul’ban terrane are performed for the first time. It is shown that Early Precambrian zircons are almost completely absent in these rocks, while Early Mesozoic zircons with Paleozoic, Neoproterozoic, and Mesoproterozoic Hf model ages dominate. Based on the data obtained, it is assumed that the Ul’ban terrane is a part of the accretionary complex of the northern framing of the Amur superterrane and is neither a depression superimposed on the Paleozoic formations of the Mongol–Okhotsk belt nor an accretionary complex in the southern framing of the North Asian Craton, as was believed earlier.

中文翻译:

乌尔班地体(蒙古-鄂霍次克褶皱带)的构造性质:碎屑锆石 U-Pb 和 Lu-Hf 同位素研究结果

摘要 首次对乌尔班地体Sorukan和Naldinda组中生代变质沉积岩碎屑锆石进行U-Pb和Lu-Hf同位素研究。结果表明,这些岩石中几乎完全没有早前寒武纪锆石,而具有古生界、新元古代和中元古代Hf模型年龄的早中生代锆石占主导地位。根据所获得的数据,假设乌尔班地体是阿穆尔地体北部框架增生复合体的一部分,既不是叠加在蒙古-鄂霍次克带古生代地层上的洼地,也不是增生复合体正如早先所认为的那样,在北亚克拉通的南部框架中。
更新日期:2020-05-01
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