New concepts on the composition, structure, and age of the Lower Amur fragment of the Late Jurassic-Early Cretaceous accretionary prism, Russian Far East

New fossil taxa of Embolemidae and Dryinidae (Hymenoptera: Chrysidoidea) are described. For Embolemidae, Embolemopsis baissensis n. gen. n. sp. and Baissobius minutus n. sp., are described from Central Siberia, West Transbaikalia, left bank of Vitim River (facing downstream), Baissa, lake deposits from earlier Early Cretaceous (Neocomian stage) (130–140 mybp). For Dryinidae, Anteonopsis antiquus n. gen. n. sp., Bocchus ? cenomanianus n. sp. and Gonatopus ? cretacicus n. sp., are described from Siberia, Magadan Region, Obeschchayushchiyi, tuffaceous deposits from Upper Cretaceous (Cenomanian) (90–95 mybp); Deinodryinus ? aptianus n. sp., is described from Central Mongolia, Bayanhongor Aimag, 5–8 Km N Bon Tsagan Nuur Lake, from impressed in lake deposits of the Khurilt rock unit probably of Aptian (Early Cretaceous) (100–115 mybp). In addition, an unidentified fossil belonging to Deinodryinus ? or Dryinus ? is recorded from Russian Far East, Maritime Province, Velikaya Kema (later Earlier or early Middle Miocene) (about 30 mybp). The known species of Baissobius Rasnitsyn are reviewed and a key is presented.

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The Early Cretaceous coal‐forming plants of southern part of East Siberia and Russian Far East

Island Arc ◽

10.1111/iar.12206 ◽

2017 ◽

Vol 26 (5) ◽

Cited By ~ 2

Author(s):

Eugenia V. Bugdaeva ◽

Valentina S. Markevich

Keyword(s):

Early Cretaceous ◽

Russian Far East ◽

Far East ◽

East Siberia

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Late Jurassic (Tithonian) radiolarians from a clastic unit of the Khabarovsk complex (Russian Far East): Significance for subduction accretion timing and terrane correlation

Island Arc ◽

10.1046/j.1440-1738.1999.00220.x ◽

1999 ◽

Vol 8 (1) ◽

pp. 30-37 ◽

Cited By ~ 32

Author(s):

Sergei Zyabrev ◽

Atsushi Matsuoka

Keyword(s):

Late Jurassic ◽

Russian Far East ◽

Far East

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Tectonostratigraphy of the Jurassic accretionary prisms in the Sikhote-Alin region of Russian Far East

Scientific Reports ◽

10.1038/s41598-021-98748-5 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Vladimir V. Golozubov ◽

Ludmila F. Simanenko

Keyword(s):

Large Scale ◽

Russian Far East ◽

Far East ◽

Volcanic Rocks ◽

Volcanic Belt ◽

Accretionary Prism ◽

Continental Plate ◽

Flat Slab Subduction ◽

Accretionary Prisms ◽

Jurassic Accretionary Prism

AbstractWe propose a scheme to subdivide the Samarka terrane, a Jurassic accretionary prism fragment, into tectonostratigraphic complexes. This subdivision provides a basis to study these formations and map them on a medium- to large-scale. Each complex corresponds to a certain stage in the accretionary prism formation. Thus, the complexes composed of subduction mélange and olistostromes (in our case, Ust-Zhuravlevka and Sebuchar complexes), can be correlated to episodes when the underthrusting of seamounts hampered subduction, as evidenced by seamount fragments contained in the complexes. Episodes of relatively quiet subduction have also been identified, resulting in complexes composed mainly of normally bedded terrigenous and biogenic formations (Tudovaka and Udeka and, partially, Ariadnoe complexes). Particularly considered is the Okrainka-Sergeevka allochthonous complex – a fragment of continental plate overhanging a subduction zone. It was included in the accretionary prism during gravitational sliding on the internal slope of the paleotrench. All volcanic rocks in the accretionary prism are allochthonous fragments of the accreted oceanic crust. The absence of the Jurassic-Berriasian volcanic belt related to this prism, as well as synchronous autochthonous volcanism, indicates that the Samarka terrane accretionary prism formed under conditions of flat-slab subduction, similar to modern examples along the Andean margin.

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