サロマ湖の湖岸・湖底地形と完新世後半のオホーツク海の海水準変動

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  • Lacustrine and Sublacustriue Microforms and Deposits near the Shoreline of Lake Saroma and the Sea Level Changes in the Sea of Okhotsk in Late Holocene
  • サロマコ ノ コガン コテイ チケイ ト カンシンセイ コウハン ノ オホーツ

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The micro sea level changes in Late Holocene can be clarified in detail by means of the investigation near the shorelines of the coastal lakes. The coastal lakes have been linked with the sea in Late Holocene. So near the shorelines of these kinds of lakes, the geomorphological or sedimentological evidences tell of the former sea levels more clearly than in the general coastal lowlands. In other words, the rate of morphological reformations by the wave or tide are not so destructive in these kinds of lakes as happen in general coastal lowlands which face the open sea.<br>In this paper, the author explain the lacustrine and sublacustrine microforms of Lake Saroma located on the coast of the Sea of Okhotsk, and obtained some sedimentological evidences that indicate several high water levels or low water levels after about 6, 000y. B. P.. The sea level changes in the Sea of Okhotsk in Late Holocene are presumed based on these data and the previous other reports.<br>As shown in Figure 11, the water level (which means the sea level or the lake level) reached +2.5-+3.5m about 6, 000y. B. P. in the early Jomon period, and after that, the water level dropped down to below -0.5m about around 4, 500y. B. P. in the middle Jomon period. After that small transgression occurred at about 4, 000y. B. P. in late Jomon period. Then the another regression occurred during 2, 500-2, 000y. B. P. (called “Yayoi Regression”), and the water level rose again about 950y. B. P. in the middle or late Heian period. About 300y. B. P. in the early Edo period, the water level was below 0m a. s. l..<br>Along the shoreline of Lake Saroma, we can see two Holocene lacustrine terraces at about 5m and 2-3m high, and widely developed littoral shelf in 2-3m depth. These lacustrine and sublacustrine microforms have been formed under the influences of the sea level changes, which consist of at least three high water levels and three low water levels in Late Holocene.<br>The sand spits, which separate the Lake Saroma and the Sea of Okhotsk, are not all formed in Late Holocene. The Pleistocene terrace deposits are found in rather large area, some parts of which are covered by sand dunes. The Holocene deposits are small, and have been added inside the Pleistocene terrace deposits near the shoreline of the lake.

収録刊行物

  • 東北地理

    東北地理 39 (1), 1-15, 1987

    東北地理学会

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