GRANODIORITES OF OLEKMINSKY COMPLEX OF THE EASTERN TRANSBAIKALIA: U-Pb LA-ICP-MS ZIRCONS GEOCHRONOLOGY AND AGE POSITION OF COMPLEX

Geodynamics & Tectonophysics Pub Date : 2024-02-16 DOI:10.5800/gt-2024-15-1-0740

S. I. Dril, V. Kovach, А. В. Kotov, K.‐L. Wang, А. М. Larin, Y. Iizuka, H.-Y. Lee

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Abstract

The palingenic calc-alkaline granitoid massifs of the Olekminsky complex form a magmatic belt stretching within the Western-Stanovoy terrane in the northeastern direction for more than 700 km. New U-Pb LA-ICP-MS dates for zircons from the granodiorites of the Marekta-Bereinsky massif of the Olekminsky complex and the granodiorites of the Yamninsky massif of the Krestovsky complex were obtained, amounting to 371±4 Ma and 364±5 Ma, respectively. These geochronological data are well consistent with the 355–358 Ma ones, therefore suggesting the Late Carboniferous age of quartz-diorite-granodiorite-granite rocks of the Olekminsky complex. However, these dates are not correlated with the existing legends of geological maps covering the area of the Western-Stanovoy structural-formation zone or the Western-Stanovoy terrane, as the intrusive formations of the Olekminsky complex are dated as the Early Paleozoic. In addition, new geochronological data call into question distinguishing of a separate Early Paleozoic Krestovsky granitoid complex.

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外贝加尔地区东部奥列克明斯基复合地层：U-Pb LA-ICP-MS ZIRCONS 地球地质学和复合地层的年龄定位

奥列克明斯基岩群的钙碱性花岗岩岩块形成了一条岩浆带，在西部-斯坦诺沃伊岩系内部向东北方向延伸了 700 多公里。从奥列克明斯基岩群 Marekta-Bereinsky 岩块的花岗闪长岩和克里斯托夫斯基岩群 Yamninsky 岩块的花岗闪长岩中获得了新的锆石 U-Pb LA-ICP-MS 日期，分别为 371±4 Ma 和 364±5 Ma。这些地质年代数据与 355-358 Ma 的地质年代数据非常一致，因此表明奥列克明斯基岩群的石英闪长岩-花岗闪长岩-花岗岩的年代为晚石炭纪。然而，这些日期与覆盖 Western-Stanovoy 构造形成区或 Western-Stanovoy Terrane 地区的现有地质图图例并不相关，因为 Olekminsky 复合体的侵入地层被测定为早古生代。此外，新的地质年代数据对区分单独的早古生代克里斯托夫斯基花岗岩群提出了质疑。

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Geodynamics & Tectonophysics

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