※ 引述《evil (溫柔)》之銘言：
: 對了 順便請教一下關於地球板塊運動的機制為何
: 是不是熱的密度輕的物質向上升（中洋脊）
: 然後向兩旁擴張 最後冷卻後密度變大 向下沈入地函中
: 於是有板塊移動
我所知道新的review是去年science上的一篇文章︰
Mantle Convection and Plate Tectonics:
Toward an Integrated Physical and Chemical Theory
16 JUNE 2000 VOL 288 p. 2002-2007
作者︰Paul J. Tackley
摘要如下︰
Plate tectonics and convection of the solid, rocky mantle
are responsible for transporting heat out of Earth. However,
the physics of plate tectonics is poorly understood; other
planets do not exhibit it. Recent seismic evidence for
convection and mixing throughout the mantle seems at odds
with the chemical composition of erupted magmas requiring
the presence rapid progress on these two problems, with the
emergence of the first self-consistent models of plate tectonics
and mantle convection, along with new geochemical models that
may be consistent with seismic and dynamical constraints on
mantle structure.
該文後面接著還有一篇Bruce A. Buffett寫的 Earth's Core and the Geodynamo
摘要為︰
Earth's magnetic field is generated by solid motion in the liquid iron
core. Details of how this occurs are now emerging from numerical
simulations that achieve a self-sustaining magnetic field. Early
results predict a dominant dipole field outside the core, and some
models even reproduce magnetic reversals. The simulations also show
how different patterns of flow can produce similar external fields.
Efforts to distinguish between the various possibilities appeal to
observations of the time-dependent behavior of the Teld. Important
constraints will come from geological records of the magnetic field
in the past.
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