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Abstract— <p>The paper presents first geochronological and petrogeochemical data on the Middle Jurassic granites of the metalliferous Ariadnenskii ultrabasite-basite intrusion in the Sikhote-Alin Orogenic Belt. These granites with U–Pb zircon ages of 165.2 ± 1.1 and 165.48 ± 1.1 Ma are highly differentiated A-type rocks formed as a result of the melting of terrigenous rocks during the intrusion of an ultrabasite-basite OIB melt into an accretionary prism. The results obtained confirm the hypothesis of a possible rise of asthenospheric material from under a sinking oceanic plate in an unusual geodynamic setting.</p>

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Granites of the Middle Jurassic Ariadnenskii Ultrabasite-Basite Intrusion in the Jurassic Accretionary Prism (Sikhote-Alin, Russia)

  • 期刊论文

  • 发表日期：

    2025年10月2日

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  • A. I. Khanchuk,
  • A. N. Golich,
  • V. P. Molchanov

摘要

Abstract—

The paper presents first geochronological and petrogeochemical data on the Middle Jurassic granites of the metalliferous Ariadnenskii ultrabasite-basite intrusion in the Sikhote-Alin Orogenic Belt. These granites with U–Pb zircon ages of 165.2 ± 1.1 and 165.48 ± 1.1 Ma are highly differentiated A-type rocks formed as a result of the melting of terrigenous rocks during the intrusion of an ultrabasite-basite OIB melt into an accretionary prism. The results obtained confirm the hypothesis of a possible rise of asthenospheric material from under a sinking oceanic plate in an unusual geodynamic setting.