论文部分内容阅读
较热的早期地球通过板块构造机制消散较多的热量,一般来说总是通过较新岩石圈的消减。原则上这一过程可以由更长洋脊的快速扩张及其某些结合来完成,但是,目前的证据表明,新的大洋岩石圈比老的消减更慢。如果在太古宙也是这样,合适的解释就是“洋脊更长”。得到的定量表达式说明大洋的热散失与洋脊长度的立方根成比例,这一关系意味着如果太古宙热流是现在的3倍,那么就需要27倍于现在的洋脊长度,这说明在太古宙地球表面覆盖着许多移动缓慢的小板块。
The hotter early Earth dissipated more heat through plate tectonics and generally passed the abatement of newer lithosphere. In principle, this process can be accomplished by the rapid expansion of longer ridges and some combination of these, but current evidence suggests that the new oceanic lithosphere is more slowly depleted than the old. If the same is true in the Archean, a suitable explanation is “longer ridges.” The quantitative expressions obtained show that the oceanic heat loss is proportional to the cube root of the ridge length, which means 27 times longer than the current ridge length if the Arctic heat flow is now three times greater, indicating that in the Archean The Earth’s surface is covered with many slow-moving small plates.