Study On The Molybdenite Typolomorphic Characteristics Of Molybdenite In Henan Mo Metallogenic Belt,East Qinling

The East Qinling-Dabie Mountain molybdenum metallogenic belt is the largest proven molybdenum metallogenic belt in China at present,and the controlled reserves have reached 8 million tons.In this paper,nine molybdenite deposits with different types of molybdenite deposits in the area were tested and studied in detail.The similarities and differences of the thermoelectric coefficients of molybdenite deposits and molybdenite deposits with different occurrence were mainly compared.Combined with the results of in situ laser ablation plasma mass spectrometry(LA-ICP-MS)test and X-ray powder crystal diffraction,The relationship between the mineral chemical composition and crystal structure parameters and thermoelectric coefficient is further analyzed,and the main understandings are as follows:1.The molybdenite thermoelectric coefficient of different molybdenum deposits and their differences are as follows: the average value of molybdenite thermoelectric coefficient of fluorite-molybdenite type molybdenum deposit is the highest among the four molybdenum deposits,with an average value of 284.4?V/?.The average value of molybdenite thermoelectric coefficient in porphyry molybdenum deposit is 281.7?V/?.The average value of molybdenite thermoelectric coefficient from quartz vein type molybdenum deposit is 256.3?V/?.The average thermoelectric coefficient of molybdenite produced in pegmatite molybdenum deposit is the lowest,which is 240.6?V/?.The molybdenite thermoelectric coefficient values of different molybdenite subtypes contained in porphyry molybdenum deposits and their differences are as follows: the average value of molybdenite thermoelectric coefficient of porphyry-skarn subtype molybdenum deposits is the highest,which is 291?V/?.The pyroelectric coefficient of molybdenite produced in porphyry-blasting breccia subtype molybdenum deposit is the second,with an average value of 277.4?V/ ?.The pyroelectric coefficient of molybdenite produced in porphyry subtype molybdenum deposits is the lowest,with an average value of 271.9?V/?.The difference of the thermoelectric coefficient of molybdenite in different production states in the same deposit is as follows: the average value of the pyroelectric coefficient of molybdenite produced in the disseminated form is higher than that in the vein form,and the average value of the pyroelectric coefficient of molybdenite produced in the lump form is the smallest.2.The molybdenite chemical composition and its thermoelectric coefficient value have a certain regularity: in porphyry molybdenum deposits,the content and thermoelectric coefficient value are positively correlated with Re,Cr,W,and negatively correlated with S,Se,Ti,Ni,Cu,Pb,Zn,Ag,Sb,W,Sn,Bi;In the fluorite-molybdenite type molybdenum deposits,the contents of Ni,Cu,Pb,As,W are positively correlated with the thermoelectric coefficient values,while the contents of S,Ti,Cr,Re,Sn,Zn,Ag,Se,Bi,Sb are negatively correlated with the thermoelectric coefficient values.In the quartz vein type molybdenum deposit,S,Ti,Pb,Zn,As,Sb,Sn are positively correlated with the thermoelectric coefficient value.Se,Re,Cr,Ni,Cu,Ag,W and Bi are negatively correlated.3.Molybdenite of all molybdenum deposits in the measured samples is 2H type polytype,and the changes of cell parameters A and C are negatively correlated with the changes of thermoelectric coefficient values.The above research results provide valuable basis for further study of molybdenite genesis and further search for molybdenite deposits.