摘要
借助爆炸动力学理论讨论了隐爆作用的机制，提出隐爆作用的本质是因超压导致相变而发生的一种快速物理反应；而岩浆上侵至低围压的中浅层环境→气水组分分离并产生气泡→后续岩浆提供高压力梯度导致超压，即为隐爆作用得以发生的主要条件。模拟实验则进一步表明，在隐爆发生的瞬间，岩浆中的多相组分因密度差和粘度差而发生分离流动，围岩则在隐爆时的热冲击下局部碎裂并气化、液化，从而使相关的热液活动及多种成矿作用得以进行。
The cryptoexplosion of hypabyssal intrusive,due to a overpressure process resulted in phase change, is a very rapid physical reaction. After this idea, we build a general physical model of cryptoexplosion. It shows that all the adequate and essential conditions for a crytoexplosive process are only as the following: 1. A hypabyssal enviroment with a lower confining pressure,2. Some gas and liquid components separate from the primary magma and emerge a lot of bubbles during the intrusion, and 3.A very high pressure gradient due to the sequent magma would lead to a overpressur state. In such a case, either the second boiling or a vapour cap is not essential. After this analysis,we have engaged in a fractal viscid finger experiment. It showes that during the moment of cryptoexplosion,and thus the polycomponents in the magmatic system would occur a separated flow due to their density and viscosity difference. In the mean while, a part of the wall rock would be gasificated and liquefacted as well broken by the effect of the shock wave of cryptoexplosion, and thus the related hydrothermalism and most metallogeneses occur, then the cryptoexplosive breccias system and the relevant deposits are formed.
出处
《地质科技情报》
CAS
CSCD
北大核心
1997年第1期77-80,共4页
Geological Science and Technology Information
基金
地质行业基金
地矿部矿产资源定量预测及勘查评价开放实验室基金
关键词
隐爆作用
动力学
岩浆
cryptoexplosion,overpressure explosion, separated flow,metallogenesis
