Genetic Mineralogical Study Of The Qiushulin Molybdenum Deposit And The Nanying Instrusion

Nanying intrusion is located in the3-4kilometers southwest of the periphery ofMapeng Instrusion in the middle of Taihang Mountains. There are an exploringPb-Zn-Ag deposit in the Beiyingxigou,and the ore grade and quality of which arestable to some extent. Nanying intrusion may possess good mineralization potential.There hasn’t been profound research in this region yet. The resources are just simplegeological survey reports and regional geological map. This paper reaches somemeaningful conclusions through researching on the samples of granitic rocks.The reflection of petrological and geochemical study: Granitic rocks of Nanyingintrusion belong to high K Calc alkaline series and the extent of Oxidation erosion isdeep.The reflection of research on the genetic mineralogy of rocks: The granitic rocksof this region is a kind of syntectic type granite. According to the characteristics of thesharp of zircon, the crystallization temperature of the zircon in this region ranges from650℃to800℃. The liquidus of the granitic rocks are/is about800℃. The researchon potassium feldspar and zircon shows that the oxygen fugacity of the crystallizationof the rocks in this region is high and they are shaped in a relatively oxidizingenvironment. Through the analysis of the EPMA of the particular rocks and REEs ofzircon, it is known that the material source of the rocks in this region is mainlycomposed of crust source mixed with mantle-derived material.Through the comparison of the characteristics of rock types, formationconditions, origins, ages in regions with those of the Mapeng rocks, it is known thatNanying intrusion and Mapeng rocks are produced in similar time period. It ispredicted that after the formation of Mapeng rocks formed by the large eruption andcondensation of magma, a stream of magma erupts and formes some small rocksaround Mapeng rocks including the Nanying intrusion in the research region. It ispredicted that Nanying intrusion contributes to the formation of gold deposit.Qiushulin Porphyry molybdenum area is located in1-2kilometers south ofNanying intrusion. The grade of molybdenum ore in this region is good according to the statistics of the core. Through measuring the shape of Mineralized quartz flow ofthe fluid inclusions, it is known that the temperature of the ore-forming fluid is about280℃which is high-temperature hydrothermal. The average salinity of ore-formingfluid which belongs to a kind of low salinity fluid is about7.62%. The density of theore-forming fluid mainly ranges from0.7-0.85g/cm3. The depth of mineralizationwhich is medium shallow mineralization is about2.65kilometers.