HOLOCENE-EMERGED CORAL REEFS AND SEA-LEVEL CHANGES IN THE RYUKYU ISLANDS
HOLOCENE-EMERGED CORAL REEFS AND SEA-LEVEL CHANGES IN THE RYUKYU ISLANDS
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全新世出现的珊瑚礁和琉球群岛的海平面变化
DOI：
10.4157/grj.51.87
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
M. Koba
中科院分区：
文献类型：
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作者：
T. Nakata;Tatsuo Takahashi;M. Koba
琉球群岛众多的珊瑚礁为珊瑚礁的发育与晚全新世海平面变化之间的关系提供了详细的证据。这些岛屿属于构造活跃的岛弧，在历史时期经历了许多破坏性地震。因此，据推测，全新世珊瑚礁已梯田在不同的海拔高度，由于突然隆起与大地震，在不同的网站期间的冰后期海平面变化。本文试图恢复晚全新世海平面曲线。首先，构建了各种出现的珊瑚礁的横剖面，并收集了珊瑚化石进行14 C测年（图1A和1B）。2、3、5、7、8、10和11）。其次，用14 C法测定了58个珊瑚化石的年龄（表1），并绘制了小唐岛、宝岛和贵海岛的相对海平面曲线（图1和图2）。13、14和15）。然后，人们试图利用菊海岛相对海平面曲线（图15）恢复全新世晚期的海平面曲线，并对间歇性地震抬升进行了校正。间歇性地震抬升量是使用恒定的长期抬升速率（1.87米/1000年）计算的。该方法将抬升前后海平面之间的差异降至最低，其速率采用最小二乘法计算。恢复的海平面曲线（图15）类似于谢泼德曲线，表明海平面逐渐上升到现在的海平面，而不是费尔布里奇曲线，在过去的6000年中，包括几个比现在高的海平面，海平面有相当大的振荡。
The numerous coral reefs in the Ryukyu Islands provide detailed evidence of the relationship between reef development and late Holocene sea-level changes. The islands belong to the tectonically active island arc and have experienced many destructive earthquakes in the historical period. It is, therefore, assumed that the Holocene reefs have been terraced at various elevations, due to sudden uplift associated with major earthquakes, at various sites during the period of the post-glacial eustatic sea-level changes. In this paper, the authors have attempted to restore the late Holocene sea-level curve as follows. First, cross-profiles of various emerged reefs were constructed, and fossil corals were collected for 14C dating (Figs. 2, 3, 5, 7, 8, 10 and 11). Secondly, 58 fossil corals were dated by the 14C method (Table 1), and relative sea-level curves were constructed for Kodakarajima, Takarajima and Kikaijima islands (Figs. 13, 14 and 15). An attempt was then made to restore the late Holocene sea-level curve, corrected for intermittent seismic uplifts, using the Kikaijima relative sea-level curve (Fig. 15). The amounts of intermittent seismic uplift were calculated using a constant long-term up-lift rate (1.87m/1, 000yrs.) which minimized the difference between pre- and post-uplift sea-levels, the rate being calculated by least squares methods. The restored sea-level curve (Fig. 15) resembles the Shepard curve, which shows a gradual rise of the sea-level towards the present sea-level, rather than the Fairbridge curve, which oscillates considerably during the past 6, 000 years including several stands higher than the present.