Magmatic Rock Geochemical Relationship With Uranium Mineralization In Liaoning Xing Cheng-Hebei Qing Long Region Province

In The North China is a famous concentration area of large and medium-sized volcanic hydrothermal uranium, gold, silver polymetallic ore deposits. XingchengQinglong between Liaoning and Hebei Provinces is one of the important hydrothermal uranium metallogenic belts in the North China, but studies on geochemistry, especially geochemistry of uranium and thorium and isotopic chronology of the magmatitic rocks research are weak. Therefore, study on geochemistry and isotope chronology of the magmatitic rocks and investigation to the relationship between the magmatic activity and uranium mineralization are of important theoretical and practical significances.Exposed Neoarchean porphyraceous potassic migmatitic granite, fine-grained potassium feldspar granite, Mesozoic fine-grained granite, granodiorite, porphyritic granite diorite rock of rare earth elements and trace element geochemical analysis.Their states of U contents are evaluated through Pb isotopes since Neoarchean.Geochemical characteristics show that the porphyraceous potassic migmatitic granite,fine-grained potassium feldspar granite belongs to alkaline- calc- alkaline, potassic to highly-potassic, weakly peraluminous-peraluminous magmatic series. Their contents of rare earth elements are low, which are characterized by strong enrichment of light rare earth elements and depletions of heavy rare earth elements without obvious Eu anomaly. Nb, Ta, P, Ti of high field strength are depleted and K, U, Th are enriched related to neighbouring elements on a spider diagram normalized to primitive mantle. Zircon U- Pb dating results show that the upper intercept ages between an inconsistent line and concordiant curve are 2454 Ma(fine-grained potassium feldspar granite), 2540 Ma(porphyraceous potassic migmatic granite),respectively.Fine grained feldspar granite, granodiorite, porphyritic granite diorite belong to alkaline- calcium alkaline, high potassium to pledge- potassium to pledge,weakly peraluminous- peraluminous magmatic rock series, with low REE,, their negative anomaly are not clear, rocks relatively less elements of LILE such as Rb, Cs,Li, Be, and the high field strength elements Nb, Ta, Zr and Hf, Ti. Compatible Cr, Co,Ni,V, Mn and Fe are of slightly high abundance.