The 4700 aB.P. volcanic signal detected in Vostok BH8 ice core, Antarctica

• 作 者: Jean R. Petit Jefferson C. Sim■es Martine De Angelis
• 机 构: Laboratoire de Glaciologie et Géophysique de l’Environnement CNRS BP 96 Saint Martin d’Hères France
• 出 处: Chinese Science Bulletin
• 发表日期: 2005年22期
• 关键词: volcanic Antarctica The 4700 aB.P sulphate dating nitrate migration microparticl

The detailed electrical conductivity measure- ment (ECM), trace chemical compositions and microparti- cles concentration analysis are performed for BH8 ice core from the depth of 126.0m to 130.0m at Vostok Station. At depth 128.7m, a volcanic signal 4726 a B.P. is detected. The volcanic sulphate flux is 95.8 kg·km?2, sulphate peak concen- tration 1352.8 ng·g?1, duration time about 10.1 years, com- parable with some well-known volcanic events. The results indicate that it seems to be a relatively large scale, long last- ing volcanic signal with farther volcanic origin.

The detailed electrical conductivity measure (ECM), trace chemical compositions and microparticle concentrations were performed for BH8 ice core from the depth of 126.0 m to 130.0 m at Vostok Station. At depth 128.7 m, a volcanic signal 4726 a BP is detected. The volcanic sulphate flux is 95.8 kg · km -2, and sulphate peak concen- tration 1352.8 ng · g -1, duration time about 10.1 years, com parable with some well-known volcanic events. The results indicate that it seems to be a relatively large scale, long last- ing volcanic signal with farther volcanic origin.