Geology and Geomorphology of the Sakhalin Island. Late Quaternary Crustal Movement in Northern Sakhalin, Far East Russia, Estimated from Deformed Marine Terraces.

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  • UEKI Takeyuki
    Department of Geographical Science, Graduate School of Science, Tokyo Metropolitan University
  • BULGAKOV Rustam
    Institute of Marine Geology and Geophysics, Russian Academy of Science
  • OKUMURA Koji
    Department of Geography, Faculty of Letters, Hiroshima University

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Other Title
  • サハリン（樺太）島の地質と地形　　サハリン，シュミット半島北東端における海成段丘面と第四紀後期地殻変動
  • サハリン シュミット ハントウ キタトウタン ニ オケル カイセイ ダンキュウメン ト ダイ4キ コウキ チカク ヘンドウ

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Late Quaternary marine terraces are well-developed around the Yelizavety Cape, in northern Sakhalin. There are two levels of Pleistocene terraces (H and M surfaces) and four levels of Holocene terraces (F and L1-3 surfaces). The M surface is either an abrasion platform covered by talus deposits several ten meters thick, or constructional surface of littoral sand and gravel overlain by periglacial deposits less than two meters thick. These observations strongly indicate that the M surface was formed in the Last Interglacial age. The height of the M surface is 11 to 24 m above sea level, so that the average uplift rate since the Last Interglacial age is estimated to 0.1 to 0.2 mm/yr. The Tua fault to the west of the Yelizavety Cape has been inactive during the Late Quaternary, because of the scarcity of tectonic geomorphologic features along the fault. The formation age and the height of the M surface indicate that during the Late Quaternary, the uplift rate around the Yelizavety Cape is comparable with that along the eastern coast of south Sakhalin. The L surfaces are composed of storm-ridge deposits, in which well-sorted sands and granules are intercalated with peaty layers. The landward limit of the backshore of the Li Surface is 5.5 to 7.2 mabove sea level. The L1 surface was formed at Subatlantic Period (1600-520 14C yrBP).

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