The Initial Stage of Early Carboniferous Rifting in the Southern Urals: First The results of U–Pb Dating of Zircons from Granitoids of the Neplyuevka Complex,Moscow University Geology Bulletin

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The Initial Stage of Early Carboniferous Rifting in the Southern Urals: First The results of U–Pb Dating of Zircons from Granitoids of the Neplyuevka Complex
Moscow University Geology Bulletin ( IF 0.3 ) Pub Date : 2022-04-14 , DOI: 10.3103/s0145875222010136
A. V. Tevelev ₁ , A. A. Borisenko ₁ , N. V. Pravikova ₁ , A. Yu. Kazanskii ₁ , E. V. Koptev ₁ , I. A. Kosheleva ₁ , I. D. Sobolev ₂ , J. Žák ₃

Affiliation

Abstract

Zircons from the Early Carboniferous granitoids of the Neplyuevka pluton of the Southern Urals have been dated (SIMS). Two age groups are distinguished among the studied zircons: group 1 from 334 to 342 Ma and group 2 from 354 to 356 Ma. The older ages probably correspond to the time of zircon crystallization from the melt, while the younger ones resulted from a partial loss of radiogenic lead by zircons during the cooling of the pluton or from the thermal impact of the Early Carboniferous or even the Early Permian intrusions. The formation of the Neplyuevka complex at the very beginning of the Carboniferous marks the most important stage in the geodynamic evolution of the Southern Urals, a rapid transition from island arc margmatism, which continued during the Devonian, to rift-related magmatism, which ended only in the Middle Visean.

中文翻译：

南乌拉尔早石炭世裂谷初期：首先对Neplyuevka杂岩花岗岩锆石进行U-Pb测年结果

摘要

来自南乌拉尔的 Neplyuevka 岩体的早石炭纪花岗岩的锆石已经过年代测定（SIMS）。研究的锆石分为两个年龄组：第 1 组从 334 到 342 Ma，第 2 组从 354 到 356 Ma。较老的年龄可能对应于锆石从熔体中结晶的时间，而较年轻的年龄可能是由于在岩体冷却过程中锆石导致放射性铅的部分损失或早石炭世甚至早二叠世侵入体的热影响所致. Neplyuevka杂岩在石炭纪初期的形成标志着南乌拉尔地球动力学演化中最重要的阶段，即从泥盆纪持续的岛弧岩浆活动快速过渡到与裂谷相关的岩浆活动，后者仅结束在中维西恩。

更新日期：2022-04-14

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