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Abstract <p>The article presents the results of petrographic, X-ray diffraction, and geochemical analyses of siliceous rocks forming tectonic slices among the Late Albian–Campanian tuff-terrigenous rocks of the Algan terrane. The trace-element distribution and mineral composition in cherts from different tectonic units are shown to differ, which can be explained by their accumulation in different facies environments: pelagic and near-continental. The Campanian pelagic cherts indicate the existence of an oceanic basin in the region up to this period.</p>

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Composition and Facies Formation Environments of Cherts in the Algan Terrane (Pacific Margin)

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • M. Yu. Gushchina,
  • A. V. Moiseev,
  • T. N. Palechek

摘要

Abstract

The article presents the results of petrographic, X-ray diffraction, and geochemical analyses of siliceous rocks forming tectonic slices among the Late Albian–Campanian tuff-terrigenous rocks of the Algan terrane. The trace-element distribution and mineral composition in cherts from different tectonic units are shown to differ, which can be explained by their accumulation in different facies environments: pelagic and near-continental. The Campanian pelagic cherts indicate the existence of an oceanic basin in the region up to this period.