期刊
GEOLOGY
卷 33, 期 9, 页码 745-748出版社
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G21632.1
关键词
Ar/Ar dating; flood basalts; magmatism migration; mantle plume; mass extinction
类别
The peak activities of continental flood basalts are currently considered as huge and brief (similar to 1 m.y.) magmatic events, with strong implications for geodynamics and biotic turnover. New 40Ar/39Ar dates on the Karoo flood basalts (southern Africa) show a longer duration of magmatism (similar to 8 m.y., with 6 m.y. for the main volume) with an apparent south-to-north migration, along with briefer distinctive pulses inside the province. This suggests that the Karoo province does not fit the general plume model invoked for most continental flood basalts (including the Karoo) and may explain the absence of a major contemporaneous mass extinction.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据