The Crypto-explosion Breccia Pipe’s Formation And Dynamic Mechanism Of Mutougou Molybdenum Mine In The East-Qinling

Mutougou Molybdenum Mine in the East-Qinling is a breccia-type molybdenumdeposit with different of types into a whole and the dominant control factor of crypto-explosion．Study on crypto-explosive breccia pipe which is a ore forming and orecontrolling geological structure formation conditions and tectonic dynamics mechanism tohave a deepen understanding of crypto-explosive breccia type deposits and guide thefurther prospecting and exploration of the Mutougou Mo Deposit．Through a system of geological field work such as carry out the measured geologicalsections，study more than one adits, observe multiple drill cores、joints and faults，verifythe evidence of multiple topics and high-precision magnetic survey and office workprocessing of data，at the same time analysis and identification of rock samples andcombined with previous geological，geochemical and geophysical results of data in thispaper to understand the regional geology，the tectonic units and spatial distributioncharacteristics of the area and get the metallogenic epoch of Mutougou Mo deposit whichis221.1±3.6～156.1±2.6million years，the Mo mineralization and cryptoexplosivecharacterized by multiple stages and consistency， the source of crypto-explosivehydrodynamic and ore-forming material is calc-alkali magma with elevation and dosalicmixing the mantle derived magma with crustal rocks．Calculate the formation depth ofcrypto-explosive pipe is mort than ten kilometers，the scale ESR is632meters，theformation temperature is about768centigrade and the mineralization pressure is387million pascal．From the above research on Mutougou Mo deposit we made the dynamic mechanismof the crypto-explosive pipe that:Under the control of the fault structure the deepthmagmatic gas-liquid fluid upward migration�'the flow front of gas-liquid fluid form asilicide closed rock underground ten kilometers，as the changes of temperature and pressureconditions which is not erupted to the surface�'The magmatic activity and fractionateformed a plenty of gas-liquid fluid．when the pressure of gas-liquid fluid exceeds therupture of the silicide closed rock，would trigger crypto-explosion�'As the first phase crypto-explosion，decompression and crystallization of magmatic gas-liquid fluid broughtabout degradation boiling leading to the fluid volume expanded instantly, which formedmore than once crypto-explosion�'Later magmatic activity formed a multi-stage closedand crypto-explosion�'Later period tectonic transformed、be uplifted and corroded．In theend of the paper，draw out the model of crypto-explosion breccia pipe which is "Top-down,multi-stages crypto-explosive, Indepth regressive, successive superpose"．...