| 中浅成含矿岩浆的隐爆作用机制与两相分离流动 |
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| 引用本文：黄定华,向树元,朱云海,叶俊林.1996.中浅成含矿岩浆的隐爆作用机制与两相分离流动[J].地球学报,17(z1):130-134. |
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| 基金项目:地质行业基金92022项目与地矿部矿产资源定量预测及勘查评价开放实验室基金联合资助 |
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| 中文摘要:本文首次从物理上讨论了隐爆作用的具体机制，指出隐爆作用的本质是由超压导致相变而发生的一种快速物理反应。分析表明，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而导致超压，即为隐爆作用得以发生的充要条件。模拟实验表明，在隐爆发生的瞬间，岩浆中的多相组分因密度差而发生分离流动，围岩则在爆轰冲击下局部碎裂并气、液化，从而使相关的热液活动及多种成矿作用得以进行，由此形成相应的隐爆角砾岩系列及其矿床组合. |
| 中文关键词:隐爆角砾岩 超压爆炸 两相分离流动 |
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| The Cryptoexplosive Mechanics and the Separated Bi-phase Flow of Hypabyssal Intrusion |
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| Abstract:The cryptoexplosion of hypabyssal intrusive, due to a overpressure process re-sulted in phase change, is a physical reaction with a very high velocity. After this idea, we build a general physical model of cryptoexplosion. It shows that all the adequate and es-sential additions for a cryptoexplosive process are only as the following:(1)a hypabyssal enviroment with a lower confining pressur; (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 pressur gradinet due to the sequent magma would lead to a overpressur state. In such a case, either the second boiling or a vapour cap are not essential. After this analysis, we ahve engaged a fractal viscid finger experiment. It shows that during the moment of cryp-toexplosion, the polycomponents in the magmatic system would be separated to occur a kind of bi-phase flow due to their density and their viscosity ratios, and also the overpres-sur of the magma. In the mean shile, a part of the wall rock would be gasificated and liq-uefacted as well broken by the effect of the shock wave of cryptoexplosion. May well say that the related hydrothermalism and most metallogeneses are thus occur, then the crypto-explosive breccias system and the relevant deposits are formed. |
| keywords:cryptoexplosive breccias overpressure explosion separated bi-phase flow |
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