Abstract

The Paleozoic granitoids of the Urgamal pluton in the crystalline basement of the northwestern part of the Dzabkhan Terrain are considered. The age of these granitoids, 463 ± 2 Ma, was determined by the U–Pb method (ID-TIMS). The Urgamal pluton is located on the border of the Dzabkhan Terrain with the Early Caledonian formations of the Ozernaya Zone. The pluton was emplaced after the the Dzabkhan Terrain had converged with the paleo-oceanic and island arc complexes of the Ozernaya Zone. The granitoids are therefore attributed to post-accretionary formations occurring in the Early Caledonian superterrain of Central Asia. Intrusive complexes similar in age and structural position are known in the Caledonian Ozernaya Zone, Sangilen Block, Tuva-Mongolian Terrain, and the Olkhon Terrain of the framing of the East Siberian Platform. Geological settings of these complexes allow the time of integration of the Early Caledonian superterrain of Central Asia and the Siberian Platform to be estimated.

中文翻译：

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东西伯利亚平台古苏格兰早期框架的Dzabkhan地形结构中的增生后类花岗岩

摘要

考虑了Dzabkhan地形西北部结晶基底中Urgamal岩体的古生代花岗岩。这些花岗石的年龄为463±2 Ma，通过U–Pb方法（ID-TIMS）确定。Urgamal岩体位于Dzabkhan地形与Ozernaya地带的早期喀里多尼亚地层的边界。在Dzabkhan地形与Ozernaya区域的古海洋和岛屿弧复合体汇合之后，放置了岩体。因此，花岗岩类归因于中亚早古苏格兰超地带中的增生后地层。在东西伯利亚平台框架中的加里东尼亚Ozernaya地区，Sangilen街区，Tuva-蒙古地形和Olkhon地形中，已知年龄和结构位置类似的侵入性复合体。