(Table 3) 14C ages and main characteristics of the marine tephra in core MD90-917@en

The age of marine tephra has been assessed through 14C datings performed on planktonic foraminifera picked out in the same ash-layer level and expressed in conventional radiocarbon years. A standard marine reservoir correction of 400 14C years was used throughout the entire record for the last 18 kyr (Siani et al., 2000 and Siani et al., 2001)本研究通过对采自同一火山灰层位的浮游有孔虫（planktonic foraminifera）开展碳十四测年，对海相火山碎屑（marine tephra）的形成年代进行了厘定，测年结果以常规放射性碳年为单位表示。针对过去18 kyr的全部记录，本研究全程采用了400个放射性碳年的标准海洋储库校正值（Siani等，2000；Siani等，2001）