| Jiaodong gold ore is a type of the world’s biggest tectonic hydrothermalalteration deposit related to the Mesozoic granite. At present, Jiaodong metallogenicgranite studies basic adopt the ideas and methods of unit-super unit. However, thismethod has already could not apply in-depth study of Jiaodong gold oreintracontinental ore-forming granite, and could not deepen the structural study of thegranite diagenesis period, greatly influence the realization of the goals for the golddeposit’s deep prospection, With the new thoughts of the granite tectonic lithofacies, Ichoose “the study of Jiaodong tectonic granite rocks phase distribution and Xiadiandeep gold metallogenic regularity” as the title of my master thesis. This study is ofimportant geological scientific significance and application value of geologicalprospecting.During Master’s study, I have participated Shandong gold Exploration project“Laizhou-Zhaoyuan tectonic lithofacies system evolution and metallogenic regularity”.And was mainly responsible for granite tectonic lithofacies research.through1:250000Jiaodong northwest tectonic rock and mine mapping,1:50000tectonic rock minemapping of Linglong and Jiaojia gold mine field, I have completed multiple tectonicand altered rock profile measuring, studied the typical deposits including Jiaojia, andLinglong, Xincheng, Sanshandao, Xiadian, and given priority to Xia Dian gold mine,through the indoor comprehensive and integrated research and test analysis,summarized the deep geological characteristics and metallogenic regularity of Xiadiangold ore deposit, finished the master’s degree thesis on time. Main conclusionsobtained are as follows：1.it is based on rock tectonic and structure, set up the classification of granitetectonic facies marks,and put forward Jiaodong metallogenic granite as "shearingLinglong-Kunyushan type of shear tectonic gneissic biotype granite, Squeezing phaseGuojialing compressive tectonic porphyritic granite diorite, transientluanjiahe-Weideshan middle coarse and coarse grain of monzonitic granite of transient structure " three types.2.Through field observations of granite emplacement structure，the differences ofrock and mineral geochemistry and three-dimensional rock structure measurement，particularly analyzing rock rheological extension fracture. studied Directional law ofstress field in diagenetic stage. on the basis, Compiled tectonic lithofacies distributionof Jiaodong Mesozoic metallogenic granite.3.Xiadian gold ore is hydrothermal metasomatic deposit after the magma ofmiddle temperature, middel pressur, the metallogenic fluid property belongs to thelow salinity, low density of CO2+CH4+H2O+NaCl system, the structure, fluid andalterationare are main ore-forming elements.4.Reveals structural geochemistry and physical environment and process the oftectonic fractured Altered rock gold mine, the stress value of ancient is68.8MPa～99.70MPa,it is higher in strongly potassium alteration rock. Decreases far fromrupture; fluid inclusion homogenization temperature and density have the same rule,Corresponding metallogenic hydrothermal change from alkaline PH=8.6to thechange of the acidic PH=2.8, at the same time it shows conversion of fluid physicaland chemical conditions with reducing properties of methane to oxidation propertiesof CO2.Rock geochemistry indicates that metasomatic metallogenic is a process ofalkali metasomatism which K2O,MnO,MgOand Fe2O3immigrated, Na2O,SrO andBaO emigrated and Na2O/K2O value less than1.5.On the basis of fluid inclusion’s metallogenic pressure and rock deformationstructure analysis, The value of Xiadian gold deposit’s metallogenic depth is1979.51~3014.72m with the tectonic stress correction method. |
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