Characteristics Of Fluid Inclusion And Genesis Of The Sadaigoumen Molybdenum Deposit In Hebei Province

Sadaigoumen porphyry molybdenum deposit is one of the most biggest molybdenum mineral deposit in north China.It is located in yan-liao molybdenum belt.Based on the geological investigation of the outdoors?the sduty of geology?petrography?Geochemistry of rock mass and fluid inclusion?(LA-MC-ICP-MS)U-Pb?dating,we made the researches about the background configuration of the sadaigoumen molybdenum deposit,the evolution features,the resource of the fluid inclusions and the ore-forming material,and got the fllowing conclusions:1.LA-MC-ICP-MS Zircon U-Pb dating indicates that the Granite forming age is between 247.7 ±1.2 Ma-257.35 ±1.1 Ma,the mineralization took place after the Granite forming?It is related to the collision between North China Craton and Siberian.2.Fluid inclusion studies suggest that three types of fluid inclusion are present in this deposit:pure liquid inclusions,vapor-liquid inclusions,CO2 liquid three phase inclusions.The homogenization temperatures and the salinities are various from each stage of the mineralization.The data indicates that the homogenization temperatures and the salinities of the ore-forming stage range from 160-30?.340-400?,4-14%?The pressures range from 9.08MPa to 34.14MPa,The depths range from 0.29km to 1.34km.Fluid immiscibility take effect in molybdenite deposition.3.The main elements of geochemistry for the porphyry rocks reveal the deposit have high of SiO2 value,high alkali calc-alkaline I-type.Researching petrogeochemistry showes the rocks enriched in LILE(such as K,Rb?BaandTh),relatively depleted in HFSE(such as Nb?Ta?P?Ti)except(Zr Hf).Re-(Y+Nb)and Rb-(Yb+Ta)construct graph tells us the granites are Syn-COLQforms in middle depth,reducing environment,Crystallization.4.The components are various at each stage.H2O?CO2?CH4?CO?N2 are contained in the inclusions at the ore-forming stage...