Activity of Changbaishan Tianchi Volcano Since Late Pleistocene--The Constrain From Geochr

Activity of Changbaishan Tianchi Volcano Since

Late Pleistocene--The Constrain From Geochronology of High Precision U- Series Tims

Method

Wang Fei;Chen Wenji;Zhang Zhonglu;Hu Yutai ;Peng Zicheng

【期刊名称】《世界地质（英文版）》 【年(卷),期】2000(003)001

【摘要】11 samples of lava and pumice from the cone of Changbaishan Tianchi Volcano, Jiling, China, were dated by using high precision U - series TIMS method. We conclude that the bottom of the cone formed before 350 ka, the middle part in 70～80 ka, the upper during 20～ 1ka, and the top less than 1ka, and the age based periods of the volcano eruption since Late Pleistocene is given as follows: ＞ 350ka, 70ka, 18 ～ 25ka, 10ka, 4C5ka, 1～0.75ka, which may offer the basis for the study of volcanic disaster in future. In addition, the principle of dating young volcanic rocks by using U - series TIMS method is introduced briefly. Differentiation characteristics of U and Th in different minerals of the volcanic rocks are discussed, and the ability producing isochrons, based on U and Th differentiation, are discussed. In the last part of the paper,the closure of samples to the elements U and Th, which is important

for

age

results,

is

discussed

by

using

(234U/238U)radioactivity ratio which can be used to monitor if the

samples have been weathered or eroded or leached since the time they formed. In this study, all samples have (234U/238U) activity ratios within 1% of secular equilibrium ((234U/238U) radioactivity ratios are unity), indicating no disturbance of the 234U- 238U system. All of these discussions show that the TIMS method is good to date Tianchi volcanics and the results are reliable. 【总页数】9页(32-40)

【关键词】Volcanic rock;U - series TIMS method;period of the Tanchi volcano eruption

【作者】Wang Fei;Chen Wenji;Zhang Zhonglu;Hu Yutai ;Peng Zicheng 【作者单位】Institute of Geology, China Seismological Bureau, Beijing 100029 P. R. China;Institute of Geology, China Seismological Bureau, Beijing 100029 P. R. China;Institute of Geology, China Seismological Bureau, Beijing 100029 P. R. China;Institute of Geology, China Seismological Bureau, Beijing 100029 P. R. China;Department of Earth and Space Science, Science and Technology University of China, Hefei, 230026 P. R. China 【正文语种】中文 【中图分类】P5 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_global-geology_thesis/0201251856950.html

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