岩浆驱动破裂的形态研究

轴地壳岩浆房是活动扩张中心海洋地壳结构的一个重要组成部分,轴地壳岩浆房通过深部岩浆源的补充,内部岩浆的同化熔融、结晶分异等岩浆房过程,其中的岩浆会破裂上覆的岩石层形成岩浆破裂,并沿岩浆破裂继续向上迁移。本文建立了岩浆迁移的层流模型,从理论上对岩浆迁移问题进行了探讨,并将遗传算法引入到该问题中来,用遗传算法求解了描述岩浆驱动破裂传播的积分方程。如果假设岩浆破裂在远离破裂末梢处的权限宽度为1M,则靠近末梢,破裂的宽度逐渐加大,在末梢处宽度为2m左右。并根据文献对岩浆流体的一些观测参数计算得出,岩浆破裂权限宽度不会很大,一般在1m左右的量级。

The shape study of magma driven crack

Axies magma chamber(AMC) is one of the most important part of oceanic crust in the active spreading center. Once the magma reaches to the AMC from the deep magma reservoir, the segregated magma will break the upper layer and continually migrated towards the surface driven by the buoyancy. The magma driven crack formed in this progress. Based on the Boussinesq model, the problem of magma crack migration was discussed in this paper and the Genetic Algorithm was used to calculated the shape of the magma driven crack. Assume the limited width far from the crack tip is 1, the width of the crack becomes lager and lager as coming near to the crack tip and reaches almost 2 at the tip. Based on the measured parameters of magma fluid given by references, the paper points that the limited width of the magma driven crack is about 1 meter.