五大连池新期火山岩浆房动力稳定性探讨

The stability of the magma chamber under Wudalianchi modern volcanoes

岩浆房系统的稳定性决定于岩浆房本身的冷却和内部运动以及岩浆房周围岩体的挤压和振动等外界因素,一定条件下,外部因素可能起到更为重要的作用。以五大连池新期火山老黑山岩浆房为例,基于岩浆热传导方程和岩浆房系统振荡的杜芬方程组,通过数学变换和计算得到:五大连池新期火山岩浆房固结与否和岩浆房中岩浆的存在历史密切相关;围岩无预热条件下老黑山岩浆房已固结了6 0年左右,而在充分预热条件下,岩浆房尚需6 0年左右才完全固结,因此较保守的结论是岩浆房已近于完全固结。同时杜芬模型揭示火山区岩浆房系统可能存在复杂的非线性动力学行为。

The stability of the magma chamber is controlled by interior factors such as the behavior of activities and the cooling rate of the magma chamber as well as exterior factors like the extrusion and vibration of the rocks around the magma chamber. Under certain conditions, the activities of the rocks around the magma chamber can play a crucial role in the stability of magma chamber, especially in the area with frequent crustal movement. The aim of this study is to simulate the processes of the magma chambers of Laoheishan volcano in Wudalianchi area. On the basis of the heat conduction equation and the coupling of Duffing equations of the magma chamber, it is concluded that whether the Laoheishan magma chamber has been cooled or not is closely related to the heating history of the rocks around the magma chamber, and that the magma has approached complete solidification and some nonlinear processes must have existed in the dynamic system of the magma chamber.