| 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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| 关键词:cryptoexplosive breccias overpressure explosion separated bi-phase flow |
| 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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| The Cryptoexplosive Mechanics and the Separated Bi-phase Flow of Hypabyssal Intrusion |
| 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. |
| Huang Dinghua,Xiang Shuyuan,Zhu Yunhai,Ye Junlin.1996.The Cryptoexplosive Mechanics and the Separated Bi-phase Flow of Hypabyssal Intrusion[J].Acta Geoscientica Sinica,17(z1):130-134. |
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