Calculated reservoir ages using paired AMS ^<14>C and MC-ICP-MS U-Th dating of foraminifera test, implications for paleoceanography

使用配对 AMS ^<14>C 和 MC-ICP-MS U-Th 定年有孔虫测试计算储层年龄，对古海洋学的影响

• 批准号: 17540443
• 负责人: MURAYAMA Masafumi
• 金额: $ 2.37万
• 依托单位: Kochi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17540443/
• 关键词: Geochronology; Accelerator Mass Spectrometory; Radiocarbon; U-Th age; Reservoir effect; MC-ICP-MS; MC-TCP-MS

AMS14C age of planktonic foraminifera from core samples must be corrected for differences between the 14C age of surface water and the contemporaneous atmosphere prior to calculation of a calendar age. This is because the waters of the deep ocean are out of equilibrium with respect to the atmosphere causing marine carbon-containing material to appear older than material formed in equilibrium with the atmosphere. Reservoir ages have been calculated using paired AMS 14C and MC-ICP-MS U-Th dating of small amounts of foraminifera tests from the eastern equatorial Pacific. The results show a marked reduction in reservoir age during 50 kyrs.

在计算日历年龄之前，必须根据地表水和同期大气的 14C 年龄之间的差异，对岩心样本中浮游有孔虫的 AMS14C 年龄进行校正。这是因为深海水域相对于大气不平衡，导致海洋含碳物质看起来比与大气平衡时形成的物质更古老。使用配对的 AMS 14C 和 MC-ICP-MS U-Th 测年法对来自赤道东太平洋的少量有孔虫测试计算了储层年龄。结果显示储层年龄在 50 kyrs 期间显着降低。

项目成果

高知県仁淀村に分布する鳥巣石灰岩のストロンチウム同位体年代

高知县仁淀村分布的鸟栖石灰岩的锶同位素年龄

• 发表时间: 2005
• 期刊: 地質学雑誌 111
• 作者: 白石史人;早坂康隆;高橋嘉夫;谷水雅治;石川剛志;松岡淳;村山雅史;狩野彰宏
• 通讯作者: 狩野彰宏

Geochronology and paleoceanographic history of Quaternary sediments from southwestern part of Pacific-Antarctic Ridge, the Ross Sea, Antarctica.

南极洲罗斯海太平洋-南极海脊西南部第四纪沉积物的年代学和古海洋学历史。

• 发表时间: 2006
• 作者: Murayama;M.;Yagi;Y.;Mishima;T.;Horikawa;K.;Sagawa;T.;Kodama;K.;Kato;Y.;and Minagawa
• 通讯作者: and Minagawa

Oceanic frontal system oscillations in the Australian sector of the southern ocean during the late Quaternary

第四纪晚期南大洋澳大利亚区的海洋锋面系统振荡

• 发表时间: 2007
• 作者: Ikehara;M.;Hatakeyama;E.;Nishigawa;M. and Muravama;M.
• 通讯作者: M.

Core correlations of three sites straddling the equator in the eastern Pacific

东太平洋横跨赤道的三个地点的核心相关性

• 发表时间: 2005
• 作者: Murayama;M. ;et. al.
• 通讯作者: et. al.

Spatial and temporal sea-surface temperatures in the eastern equatorial Pacific over the past 150 kyr

过去150 kyr赤道东太平洋海面时空温度

• 发表时间: 2006
• 期刊: Geophysical Research Letter 33
• 作者: Horikawa;K.;et. al.
• 通讯作者: et. al.