摘要
本文对五大连池地区火山的喷发时代、活动时序进行了较为详细的研究。通过对样品中细晶橄榄石含过剩氩这一问题,对已有的年龄数据的可用性进行了分析对比,得到了五大连池地区火山岩中橄榄石含量对年龄数据的影响程度,即当样品中细晶橄榄石含量在5%左右时,对200 ka左右的年龄结果,其影响程度在5%以下。根据已有的同位素测年结果,将五大连池火山群的喷发时间分为1.3Ma、0.9～0.8 Ma、0.6～0.45 Ma、0.38～0.24 Ma、0.16 Ma、0.09 Ma和270 a 7个时段;根据喷发时段,可以得出五大连池火山群活动自中更新世以来其喷发间隔大约为70～80 ka。
This paper presents a detailed study of the eruption ages and time series of activity of volcanoes in the Wudalianchi area. Based on the fact that the fine crystalline olivine in the samples contains excess argon, analyses and correlation are made of the available data to evaluate their usability. Consequently, the effects of olivine content on the age data have been known:when the content of fine crystalline olivine in the samples is around 5 %, the effecting degrees will be below 5% for age data of about 200 ka. According to the available isotopic age data, the volcano swarms in the area are divided into 7 interals, i. e. , 1. 3 Ma, 0. 9～0. 8 Ma, 0. 6～0. 45 Ma, 0. 38～0. 24 Ma, 0.16 Ma, 0. 09 Ma and 270 a, from which it is known that the eruption intervals since the Middle Pleistocene should be 70～80 ka.
出处
《地质论评》
CAS
CSCD
北大核心
1999年第S1期393-399,共7页
Geological Review
基金
中国地震局九五重点项目(编号95-11-03-01)资助
关键词
五大连池火山群
橄榄石
过剩氩
年代学
Wudalianchi volcano swarms
olivine
excess argon
chronology
