吉林龙岗第四纪火山活动分期
Periods of Quartern ary volcanic activity in Longgang area, Jilin province
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摘要: 在约1700km^2的龙岗火山区内分布100多个玄武质岩浆爆破成因的火山渣锥和射气岩浆成因的低平火山口-龙湾,最新喷发距今约1500-1600年。本文在火山地质研究基础上,测定了龙岗第四纪火山活动形成的熔岩台地、火山渣锥、低平火山口、火山碎屑席等不同火山地质体的31个火山岩K-Ar年龄和2个岩化木与与泥炭层的^14C年龄,厘定了龙岗第四纪3期火山活动的时间:小椅山期(早更新世:2.15-0.75Ma)、龙岗期(中-晚更新世:0.68-0.05Ma)和金龙顶子期(全新世:1600-1500a.BP)。
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Key words:
- Longgang volcano /
- Volcanic geology /
- Chronology /
- Period /
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