STRUCTURE FEATURES OF ULLEUNG BASIN & TROUGH (SOUTHERN JAPAN SEA)

V. L. Lomtev

doi:10.15356/0435-4281-2017-4-50-63

STRUCTURE FEATURES OF ULLEUNG BASIN & TROUGH (SOUTHERN JAPAN SEA)

V. L. Lomtev

https://doi.org/10.15356/0435-4281-2017-4-50-63

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Abstract

New features of the structure of the Ulleung basin & trough (Southern Japan Sea) and its Neogene-Quaternary sediment cover were found by newly conducted single- & multichannel seismic profiling and drilling. Both landforms appeared in consequence of contrast tectonic movements and active volcanism in the Middle-Late Pleistocene and related subsidence of sea bottom by 2–2.5 km and inversion of Nakton marginal trough axis (Oki ridge). It was confirmed that sediment accumulation in the basin was governed by the Hwang Ho (Yellow River) delta, avandelta and submarine fan growing and filling the marginal Nacton basin by crossbedded sediments in the Neogene – Early Quaternary. The Ulleung basin formation was accompanied by sliding of the avandelta edge, which still continues at present and produces block landslides with tsunamigenic potential. Traces of gas- and may be oil present in fan deposits were detected in SCP sections (upper, contrast and low, semitransparent strata).

Keywords

basin, trough, cover, avandelta, fan, slide, extrusion

About the Author

V. L. Lomtev

Institute of Marine Geology and Geophysics of FEB RAS
Russian Federation
Yuzhno-Sakhalinsk

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Review

For citations:

Lomtev V.L. STRUCTURE FEATURES OF ULLEUNG BASIN & TROUGH (SOUTHERN JAPAN SEA). Geomorfologiya. 2017;(4):50-63. (In Russ.) https://doi.org/10.15356/0435-4281-2017-4-50-63