Late pleistocene and halocene sea-level changes in Japan: implications for tectonic histories and mantle rheology
Late pleistocene and halocene sea-level changes in Japan: implications for tectonic histories and mantle rheology
复制标题
日本晚更新世和卤新世海平面变化：对构造历史和地幔流变学的影响
DOI：
10.1016/0031-0182(91)90028-p
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
K. Lambeck
中科院分区：
文献类型：
--
作者：
M. Nakada;N. Yonekura;K. Lambeck
在日本等构造活动区观测到的全新世和晚更新世海平面变化中，分离构造成分和冰川均衡成分对于研究构造过程和制约地幔流变学具有重要意义。分离可以通过考虑相对海平面对海平面评估地点周围海岸线几何形状的空间依赖性来实现。事实上，在海湾地区的东京和大坂等地，末次冰消作用引起的相对海平面变化曲线在全新世中期具有较高的水位，而位于半岛顶端的地点则具有一个向现代的海平面变化曲线。这种几何效应也导致了晚冰期海平面变化的区域差异。在日本列岛，预测的相对海平面的区域差异在6000年前约为5米，在10,000年前约为20米，在18,000年前约为30米。观测和预测之间的比较表明，在日本的几个站点的观测与预测的海平面变化是一致的。为了研究构造过程和地幔流变学，需要18，000年前至今的更系统的数据。
It is very important to separate the tectonic and glacial-isostatic components in the observed Holocene and Late Pleistocene sea-level changes in tectonically active areas such as Japan for studying tectonic processes and for constraining mantle rheology. The separation can be achieved by considering the spatial dependence of the relative sea-level on the geometry of the coastline around the site where sea-level is evaluated. In fact, the relative sea-level caused by the last deglaciation at sites in the embayment such as Tokyo and Osaka has a sea-level curve with a high stand at mid-Holocene, and that site situated on the tip of peninsula has a sea-level curve culminating towards the present. The geometric effect also causes the regional difference of the sea-level variations in the late glacial phase. In the Japanese Islands, the regional difference of the predicted relative sea-level is about 5 m at 6000 years ago, 20 m at 10,000 years ago and 30 m at 18,000 years ago. Comparison between observations and predictions indicates that the observations at several sites in Japan are consistent with the predicted sea-level variations. More systematic data is required for the period 18,000 years ago to the present in order to examine tectonic processes and mantle rheology.