Sm‒Nd Age of Sviatonossites of the Svyatoi Nos Peninsula (Eastern Baikal Region)

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-07-18 DOI:10.1134/s1028334x24602554

V. I. Levitskiy, V. P. Kovach, A. B. Kotov, L. Z. Reznitsky, I. V. Levitskiy, N. Y. Zagornaya

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Abstract

Sviatonossites are syenites with andradite garnet, a rare type of igneous rocks described by P. Eskola in 1913 on the Svyatoi Nos Peninsula (Lake Baikal). Due to the absence of zircon in the rocks, which makes it possible to date them reliably by the U‒Pb method, geochronological Sm–Nd studies of the bulk composition and minerals are carried out. As a result, two estimated periods of the formation of sviatonossites are obtained. According to the bulk composition and four minerals (garnet, pyroxene, potassium feldspar, and apatite), the age is 262 ± 21 Ma (RMSD = 1.6), and according to the bulk composition and garnet, it is 274 ± 25 Ma (RMSD = 0). The results obtained coincide with the timing of tectonic–metamorphic and igneous processes associated with the formation of the Eastern Transbaikalia segment of the Central Asian (Mongol–Okhotsk) folded belt. Sviatonossites in the complexes of mobile (folded) belts framed by the Siberian Craton are indicator rocks reflecting the manifestation of mantle–crustal interaction.

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斯维亚托伊诺斯半岛（东贝加尔地区）斯维亚托诺石的 Sm-Nd 年龄

摘要Sviatonossites 是一种带有安氏榴石的正长岩，是 P. Eskola 于 1913 年在斯维亚托伊诺斯半岛（贝加尔湖）描述的一种罕见火成岩。由于岩石中没有锆石，因此无法用 U-Pb 方法对其进行可靠的年代测定，因此对岩石的主要成分和矿物进行了 Sm-Nd 地质年代研究。结果，得到了两个估计的岩浆钙钛矿形成时期。根据主体成分和四种矿物（石榴石、辉石、钾长石和磷灰石），年代为 262 ± 21 Ma（RMSD = 1.6）；根据主体成分和石榴石，年代为 274 ± 25 Ma（RMSD = 0）。所获得的结果与中亚（蒙古-奥霍次克）褶皱带东外贝加尔湖段形成相关的构造-变质和火成岩过程的时间相吻合。以西伯利亚克拉通为框架的移动（褶皱）带复合体中的矽卡岩是反映地幔-地壳相互作用表现的指示岩。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.