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Abstract <p>Here we report the results of the distribution analysis of floristic remains from the Angaran and Cathaysian paleobiogeographic regions in Permian deposits of southwestern Primorye. It is shown that the Early–Middle Permian stratigraphic units (Dounay, Pospelovska, and Abrek formations) along the southern margin of the Songen–Bureya–Jiamusi–Khanka continental block contain floristic complexes of the Angaran type and no other. Their age equivalents (Kazachka and Reshetnikovka formations) in the Laoelin–Grodekovo terrane, a fragment of the Permian intraoceanic island-arc system, are characterized by a mixed composition of floristic complexes, including representatives of both the Cathaysian and Angaran paleobiogeographic regions. The first representatives of the Cathaysian flora found in deposits of the Dvoryansky terrane (Vladivostok Formation) were Middle Permian in age. Their number was significantly up by the beginning of the Late Permian. Both types of flora are assumed to spread in opposite directions across the volcanic islands of the island-arc system located between the converging Amur continental block and North China Craton during closure of the Central Asian Ocean.</p>

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Southwestern Primorye as the Easternmost Segment of the Solonker Collision Zone

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • I. V. Kemkin,
  • A. I. Khanchuk

摘要

Abstract

Here we report the results of the distribution analysis of floristic remains from the Angaran and Cathaysian paleobiogeographic regions in Permian deposits of southwestern Primorye. It is shown that the Early–Middle Permian stratigraphic units (Dounay, Pospelovska, and Abrek formations) along the southern margin of the Songen–Bureya–Jiamusi–Khanka continental block contain floristic complexes of the Angaran type and no other. Their age equivalents (Kazachka and Reshetnikovka formations) in the Laoelin–Grodekovo terrane, a fragment of the Permian intraoceanic island-arc system, are characterized by a mixed composition of floristic complexes, including representatives of both the Cathaysian and Angaran paleobiogeographic regions. The first representatives of the Cathaysian flora found in deposits of the Dvoryansky terrane (Vladivostok Formation) were Middle Permian in age. Their number was significantly up by the beginning of the Late Permian. Both types of flora are assumed to spread in opposite directions across the volcanic islands of the island-arc system located between the converging Amur continental block and North China Craton during closure of the Central Asian Ocean.