High-Precision Laser 40Ar/39Ar Dating of Qiongbei Volcanic Rocks
详细信息   
摘要
ary" name="EnDivSummary">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.
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