Radiocarbon age offsets of plant and bioclast in the Holocene sediments from the Miyazaki Plain, southeast coast of Kyushu, southwest Japan
Radiocarbon age offsets of plant and bioclast in the Holocene sediments from the Miyazaki Plain, southeast coast of Kyushu, southwest Japan
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日本西南部九州东南海岸宫崎平原全新世沉积物中植物和生物碎屑的放射性碳年龄偏移
DOI：
10.1017/rdc.2019.114
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发表时间：
2019
期刊：
影响因子：
8.3
通讯作者：
Futoshi Nanayama
中科院分区：
文献类型：
--
作者：
Toshimichi Nakanishi;Wan Hong;Mitsuhiro Kuwahata;Shinji Sugiyama;Shoichi Shimoyama;Ken’ichi Ohkushi;Tatsuhiko Yamaguchi;Jung-Hun Park;Gyujun Park;Futoshi Nanayama
为了探讨古环境变化与海洋储层效应之间的关系，对全新世同一沉积岩心层位的海洋生物碎屑和陆生植物进行了放射性碳年龄测定。这个核长约9米，来自九州岛东南的宫崎平原南部，面对黑潮暖流。该钻井地点位于与菲律宾海板块俯冲有关的隆起地区。通过岩石学分析、软体动物和有孔虫组合分析和放射性碳定年分析，我们确定了4个沉积单元：潮滩、内湾、Kikai-Akahoya火山灰和三角洲平原。这些古环境变化主要与冰期海平面上升有关。从潮滩相到内湾相的9对储层年龄在7300 ~ 8200 cal BP之间。水库效应的年代性变化与东亚其他沿海地区全新世沉积物的年代性变化具有相关性。
To investigate the relationship between paleoenvironmental changes and marine reservoir effects, the radiocarbon ages of marine bioclasts and terrestrial plants from the same horizons of a sediment core in the Holocene Epoch were measured. This core, with a length of approximately 9 m, was obtained from the southern part of the Miyazaki Plain southeast of Kyushu Island, which faces the Kuroshio warm current. This drilling site is located in an uplift area associated with the subduction of the Philippine Sea Plate. Based on analyses of lithology, molluscan and foraminifera assemblages, and radiocarbon dating, we interpreted four sedimentary units in order of age: tidal flat, inner bay, Kikai-Akahoya volcanic ash, and delta plain. These paleoenvironmental changes were mainly associated with the sea-level rise during the deglacial period. The reservoir ages of nine pairs from the tidal flat to inner bay facies were found to be from the time span of 7300–8200 cal BP. The chronological changes in the reservoir effect are correlated with those seen in Holocene sediments of the other coastal area in East Asia.