Mantle plumes and the periodicity of magnetic field reversals
作者:
D. E. Loper,
K. McCartney,
期刊:
Geophysical Research Letters
(WILEY Available online 1986)
卷期:
Volume 13,
issue 13
页码: 1525-1528
ISSN:0094-8276
年代: 1986
DOI:10.1029/GL013i013p01525
数据来源: WILEY
摘要:
Many geological phenomena show long term cyclical behavior. Of particular interest are mass extinctions and geomagnetic‐field reversals, which may have correlated periodicities of approximately 30 myr. We propose that these cycles are governed by periodic instability of the thermal boundary layer (D″) at the base of the mantle. As this mobile layer thickens by thermal diffusion, it becomes dynamically unstable and hot material erupts from it. The layer, now thinner, extracts heat from the core at a greater rate, increasing the energy supply and hence the reversal frequency of the dynamo. The hot material from the D″ layer rises via mantle plumes to the surface where it causes increased volcanic activity which affects the climate and
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