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Abstract <p>The article studies the nature, geologic structure, and metallogenic features of the Yudoma–Maya trough in the southeastern part of the Northeastern Craton. Both our own materials and earlier published data were used (1 : 1 000 000–1 : 200 000): the results of processing and interpreting the digital elevation models (DEMs) derived from the Shuttle Radar Topography Mission data (SRTM-03), gravity survey, 2D seismic survey, magnetotelluric sounding, and revision mapping survey data. A 1 : 2 500 000 structure–contour map of the trough accompanied with cross-sections was constructed. The trough was formed in the Mesoproterozoic on the crystalline basement of the Aldan Shield. It extends submeridionally for 700 km varying in width between 40 and 170 km. In the south, the rift wedges out within the Aldan Shield, and in the north, it is fully overlain by Paleozoic sediments. The trough becomes deeper and wider to the north, where maximum depth to the top of the crystalline basement beneath the trough is more than 24 km. Shallow deposition environments are indicative of slow subsidence over about one billion years. Igneous complexes of the trough hosted in thick Neoproterozoic sequences are central-type ultramafic–alkali intrusions, dolerite and trachybasalt dikes and sills. More ancient igneous complexes are overlain by younger sediments. It is possible to study their composition in exposed host rocks outside the trough. The Yudoma–Maya trough is characterized by a noncoeval metallogeny. It consists of large deposits with rare-earth elements, tantalum, niobium, large stratiform complex deposits with silver and germanium, as well as copper and gold deposits.</p>

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Geology, Deep Structure, and Metallogeny of the Yudoma–Maya Trough (Southeastern Flank of the North Asian Craton)

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • V. A. Gur’yanov,
  • A. N. Didenko,
  • G. Z. Gilmanova

摘要

Abstract

The article studies the nature, geologic structure, and metallogenic features of the Yudoma–Maya trough in the southeastern part of the Northeastern Craton. Both our own materials and earlier published data were used (1 : 1 000 000–1 : 200 000): the results of processing and interpreting the digital elevation models (DEMs) derived from the Shuttle Radar Topography Mission data (SRTM-03), gravity survey, 2D seismic survey, magnetotelluric sounding, and revision mapping survey data. A 1 : 2 500 000 structure–contour map of the trough accompanied with cross-sections was constructed. The trough was formed in the Mesoproterozoic on the crystalline basement of the Aldan Shield. It extends submeridionally for 700 km varying in width between 40 and 170 km. In the south, the rift wedges out within the Aldan Shield, and in the north, it is fully overlain by Paleozoic sediments. The trough becomes deeper and wider to the north, where maximum depth to the top of the crystalline basement beneath the trough is more than 24 km. Shallow deposition environments are indicative of slow subsidence over about one billion years. Igneous complexes of the trough hosted in thick Neoproterozoic sequences are central-type ultramafic–alkali intrusions, dolerite and trachybasalt dikes and sills. More ancient igneous complexes are overlain by younger sediments. It is possible to study their composition in exposed host rocks outside the trough. The Yudoma–Maya trough is characterized by a noncoeval metallogeny. It consists of large deposits with rare-earth elements, tantalum, niobium, large stratiform complex deposits with silver and germanium, as well as copper and gold deposits.