Scholarlink

Abstract <p>The results of U‒Th‒Pb (LA-ICP-MS) dating of detrital zircons reveal late Ediacaran ca 556–540 Ma age of the Baykonur Formation and eponymous glaciation in the Middle Tianshan (MTS) of eastern Kyrgyzstan. The widespread occurrence of the Baykonur diamictites in Kazakhstan and the Tianshan over a distance of more than 1600 km points to a significant extent of glaciation. The association of glacial deposits with shallow-marine fine-grained siliciclastic and carbonate facies indicates lack of connection with mountain glaciers. In the Tarim Craton, which in the Precambrian represented a single continent with the MTS, the stratigraphic correlative of the Baykonur Formation is the Hankalchough diamictite which has a similar age according to chemostratigraphic data. Paleomagnetic data indicating that in the Ediacaran the Tarim and MTS located at low latitudes &lt;30° suggest that the Baykonur glaciation covered most of the Earth’s surface and represented one of the largest glacial events in the Neoproterozoic.</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

Late Ediacaran Glacial Deposits of the Baykonur Formation, Middle Tianshan of East Kyrgyzstan: Age Substantiation Based on Detrital Zircon U–Th–Pb (LA-ICP-MS) Geochronological Study

  • 期刊论文

  • 发表日期：

    2025年2月1日

查看全文
  • D. V. Alexeiev,
  • A. K. Khudoley,
  • A. G. Shevkunov,
  • A. V. Kulikova,
  • T. N. Aidarkulov,
  • K. R. Minnebaev

摘要

Abstract

The results of U‒Th‒Pb (LA-ICP-MS) dating of detrital zircons reveal late Ediacaran ca 556–540 Ma age of the Baykonur Formation and eponymous glaciation in the Middle Tianshan (MTS) of eastern Kyrgyzstan. The widespread occurrence of the Baykonur diamictites in Kazakhstan and the Tianshan over a distance of more than 1600 km points to a significant extent of glaciation. The association of glacial deposits with shallow-marine fine-grained siliciclastic and carbonate facies indicates lack of connection with mountain glaciers. In the Tarim Craton, which in the Precambrian represented a single continent with the MTS, the stratigraphic correlative of the Baykonur Formation is the Hankalchough diamictite which has a similar age according to chemostratigraphic data. Paleomagnetic data indicating that in the Ediacaran the Tarim and MTS located at low latitudes <30° suggest that the Baykonur glaciation covered most of the Earth’s surface and represented one of the largest glacial events in the Neoproterozoic.