High-Precision Laser 40Ar/39Ar Dating of Qiongbei Volcanic Rocks
详细信息
- 责任者：Sa Xiao (Key Laboratory of Orogenic Belts and Crustal Evolution ; Peking University ; Beijing 100871 ; China) ; Ji Jianqing
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(8)
- 关键词：火山岩 ; volcanic rocks ; 氩—氩计时 ; Ar-Ar dating ; 海南 ; Hainan Province
- 页码：p.2789-2795
- 图表：3 illus., 1 table, 22 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Since Late Cenozoic era,volcanic rocks have been frequently and massively erupted in the Leiqiong area. Those volcanic rocks,on the basis of K-Ar dating method,are divided to several volcanic phases. In this paper,laser 40Ar/39Ar dating method is used to test and calculate the accurate time of volcanic rocks in Qiongbei area. The high quality data result by laser 40Ar/39Ar dating method shows that the time spans of eruption of Qiongbei volcanoes are around 1.3～0.052Ma. Considering the differences between the apparent ages and the isochron ages,a series of ages are recommended. As shown as the data,there are widespread inherited 40Ar* and 36 Ar excess in the Cenozoic volcanic rocks,then the isochorn ages are more recommended to be the real ages of the eruptions.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |