Scholarlink

Abstract— <p>This paper is focused on the results of the Rb–Sr isotope dating of gold-bearing quartz–sericite–dolomite altered wall-rock (beresite) at the Kekura deposit, Western Chukotka. The results obtained constrain the temporal relationship between ore formation and the emplacement of granodiorite. Due to the fine-grained nature of the metasomatic rock, a density fractionation was used to separate mineral sample for subsequent isotope study. The Rb–Sr isochron yields an age of 111.4 ± 1.1 Ma for altered wall-rock, which is consistent with the U–Pb zircon age of 110.6 ± 1.2 Ma obtained from the same sample. The established age of the rocks indicates an absence of a significant time gap between the granodiorite intrusion and the hydrothermal alteration processes associated with gold mineralization at the Kekura deposit. These findings provide a strong evidence for a relation of the studied processes within a single ore-forming system.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Age of Magmatic and Metasomatic Rocks of Kekura Gold Deposit, Western Chukotka, Russia: Evidence from U–Pb and Rb–Sr Isotope Data

  • 期刊论文

  • 发表日期：

    2026年2月1日

查看全文
  • E. V. Nagornaya,
  • M. O. Anosova,
  • I. A. Baksheev,
  • Yu. A. Kostitsyn,
  • V. O. Yapaskurt

摘要

Abstract—

This paper is focused on the results of the Rb–Sr isotope dating of gold-bearing quartz–sericite–dolomite altered wall-rock (beresite) at the Kekura deposit, Western Chukotka. The results obtained constrain the temporal relationship between ore formation and the emplacement of granodiorite. Due to the fine-grained nature of the metasomatic rock, a density fractionation was used to separate mineral sample for subsequent isotope study. The Rb–Sr isochron yields an age of 111.4 ± 1.1 Ma for altered wall-rock, which is consistent with the U–Pb zircon age of 110.6 ± 1.2 Ma obtained from the same sample. The established age of the rocks indicates an absence of a significant time gap between the granodiorite intrusion and the hydrothermal alteration processes associated with gold mineralization at the Kekura deposit. These findings provide a strong evidence for a relation of the studied processes within a single ore-forming system.