High-precision thermal ionization mass spectrometry dating of young volcanic rocks by using U-series method

被引：14
|
作者：
Wang, F [1 ]
Peng, ZC
Chen, WJ
Wang, ZR
Yang, JW
Zhang, ZL
Hu, YT
机构：
[1] China Seismol Bur, Inst Geol, Beijing 100029, Peoples R China
[2] Univ Sci & Technol China, Dept Earth & Space Sci, Hefei 230026, Peoples R China
[3] Seismol Bur Yunnan Prov, Kunming 650000, Peoples R China
来源：
CHINESE SCIENCE BULLETIN | 2000年 / 45卷 / 01期
关键词：
high precision thermal ionization mass spectrometry; U-series method; young volcanic rock; U-series age;
D O I：
10.1007/BF02884910
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
A high precision thermal ionization mass spectrometric (HP-TIMS) technique is used to determine U-238,U-234,Th-232,Th-230 concentrations and their ratios in whole rocks and minerals separated from Quaternary Maanshan, Dayingshan and Heikongshan volcanic rocks of Tengchong volcanic field,Yunnan Province, China. The U-238-Th-230 isochrons are given, yielding four age values (227 +/- 20) ka (D-1, Dayingshan), (79.6 +/- 5.5) ka (D-7, Dayingshan), (21.9 +/- 3.0) ka (h-1, Heikongshan), and (7.5 +/- 1.0) ka (M-1, Maanshan). The result is not only consistent with but also preciser than those measured by the K-Ar method and the alpha spectrometry U-series method, indicating that the HP-TIMS method is reliable and has high precision. Besides, a procedure of HP-TIMS analysis of young volcanic rocks in China is set up preliminarily.
引用
收藏
页码：83 / 87
页数：5
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