Pomatoleios kraussii (BAIRD) as a Paleo Sea Level Indicator on the Southeast Coast of Boso Peninsula, Central Japan
Pomatoleios kraussii (BAIRD) as a Paleo Sea Level Indicator on the Southeast Coast of Boso Peninsula, Central Japan
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Pomatoleios kraussii (BAIRD) 作为日本中部房总半岛东南海岸的古海平面指示器
DOI：
10.4116/jaqua.26.47
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
E. Matsumoto
中科院分区：
文献类型：
--
作者：
H. Kayanne;M. Yamamuro;E. Matsumoto
为了准确地确定古海平面的高度和年龄，有必要寻找合适的指标。波索半岛东南海岸的管虫（Pomatoleios kraussii， BAIRD）是一个很好的海平面指示物。对1923年大正地震时生长和出露的克氏带的垂直分布研究表明，克氏带的上限位于平均海平面以上0.1±0.1m处。在Hiraiso， 1703年元禄地震时出现的p.k aussii化石分布的上限为6.8m。利用P. kraussii上限与平均海平面的关系，估计源六地震前的古海平面为6.7±0.1m。在对克劳西氏杆菌管等小样本进行放射性碳测年时，样品的交替可能会导致不正确的结果。在1703年元禄地震时出土的4个化石中，有3个的放射性碳年龄比地震发生的时间要早100-250年。用扫描电子显微镜观察这些管子，发现给出较老年龄的管子已经再结晶，不能给出可靠的年龄。
In order to determine the height and age of paleo sea level precisely, it is necessary to find suitable indicators. The tube worm Pomatoleios kraussii (BAIRD) was an excellent indicator of sea level stands on the southeast coast of Boso Peninsula. Studies of vertical distribution of P. kraussii, living and emergent at the time of the 1923 Taisho Earthquake, showed that the upper limit of the P. kraussii zone was located at 0.1±0.1m above mean sea level. At Hiraiso, the upper limit of the distribution of fossil P. kraussii emergent at the time of the 1703 Genroku Earthquake was 6.8m. Using the relationship between the upper limit of P. kraussii and mean sea level, paleo sea level prior to the Genroku Earthquake was estimated to be 6.7±0.1m.On dating radiocarbon ages of small samples such as P. kraussii tubes, the alternation of samples might lead to incorrect results. Three out of four radiocarbon ages of fossil P. kraussii tubes emergent at the time of the 1703 Genroku Earthquake were dated to be about 100-250 years older than the time of the earthquake. Observation of these tubes by scanning electron microscopy revealed that the tubes which gave the older ages had been recrystallized, and did not yield reliable ages.