HOLOCENE SEDIMENTARY HISTORY OF SOME COASTAL PLAINS IN HOKKAIDO, JAPAN : III. TRANSITION OF DIATOM ASSEMBLAGES IN TOKORO ALONG THE OKHOTSK SEA

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  • 北海道海岸平野における完新世堆積環境の変遷III : オホーツク海沿岸常呂における珪藻遺骸群集の変遷
  • 北海道海岸平野における完新世堆積環境の変遷-3-オホーツク海沿岸常呂における珪藻遺骸群集の変遷〔英文〕
  • ホッカイドウ カイガン ヘイヤ ニ オケル カンシンセイ タイセキ カンキョウ

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Abstract

Core samples of sediments obtained from Tokoro along the Okhotsk Sea were studied to clarify the Holocene history of paleoenvironments based upon diatom assemblages. The Holocene history of Tokoro is inferred to be as follows. The sampling site in Tokoro was formed by the influence of flowing waters before 9,000 y.B.P. The initiation of transgression began from about 9,000 y.B.P. The transgression reached a peak about 6,000 y.B.P., and Tokoro was covered with sea water at this period. After that, relative regression, including depositional regression, occurred, and reached its maximum about 4,000 y.B.P. After 4,000 y.B.P., the transgression occurred again. Oceanic sea water flowed into TOKORO-1 site, and in TOKORO-2 site, a saline lagoon was developed. The saline lagoon lost its salinity about 3,000 y.B.P. Finally, relative regression occurred, and these sites became characterized by freshwater conditions including flowing waters.

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