Holocene relative sea-level change and rate of sea-level rise from coastal deposits in the Toyooka Basin, western Japan
Holocene relative sea-level change and rate of sea-level rise from coastal deposits in the Toyooka Basin, western Japan
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日本西部丰冈盆地沿海沉积物全新世相对海平面变化和海平面上升速率
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Hiroshi P. Sato
中科院分区：
文献类型：
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作者：
K. Tanigawa;M. Hyodo;Hiroshi P. Sato
本文研究了日本西部丰田卡盆地11,200 ~ 500 cal. BP的相对海平面变化。对32个全新世厚河流和海相沉积物岩心进行了硅藻组合和沉积硫分析。根据19个岩心在海拔- 46.85 ~ +1.51 m范围内的温度年代学和31个放射性碳年龄，建立了年龄模型。Toyooka盆地的RSLs在10,000 cal. BP时海拔为- 31.05 m，在7900 cal. BP时海拔为- 4.00 m，在6700 cal. BP时海拔为- 0.47 m，在3300 cal. BP时海拔为+0.15 m。在10,600至10,300 cal. BP期间，观测到海平面以约23毫米/年的速度迅速上升。在10,000至7900 cal. BP之间，相对海平面以每年约12毫米的速度上升。海平面上升速度在7900 cal. BP时减慢，从大约12毫米/年（10,000-7900 cal. BP）降至3毫米/年（7900 - 6700 cal. BP）。中全新世的海平面高点可能发生在7000 ~ 6000 cal. BP之间，但其海拔高度仍难以确定。这里描述的这些RSL特征可能是日本岛屿由浮力和水均衡分量引起的全新世海平面变化的一个典型例子。
This study presents relative sea-level (RSL) change from 11,200 to 500 cal. BP in the Toyooka Basin, western Japan. Diatom assemblage and sedimentary sulfur analyses were performed for 32 sediment cores obtained from thick Holocene fluvial and marine deposits. An age model was constructed based on tephrochronology and 31 radiocarbon ages from elevations of −46.85 to +1.51 m in 19 cores. The RSLs in the Toyooka Basin are −31.05 m in elevation at 10,000 cal BP, above −4.00 m at 7900 cal. BP, −0.47 m at 6700 cal. BP and +0.15 m at 3300 cal. BP. A rapid sea-level rise, at a rate of about 23 mm/yr, is observed during the period from 10,600 to 10,300 cal. BP. Relative sea-level rose at a rate of about 12 mm/yr between 10,000 and 7900 cal. BP. The rate of sea-level rise decelerated at 7900 cal. BP, from about 12 mm/yr (10,000–7900 cal. BP) to 3 mm/yr (7900–6700 cal. BP). The mid-Holocene sea-level highstand probably occurred between 7000 and 6000 cal. BP, but it remains difficult to constrain its elevation. These RSL features described here may provide a typical example of Holocene sea-level changes resulting from both eustatic and hydro-isostatic components for the Japanese islands.