Tectonic Analysis And Coupling Mineralization Of Tectonic-fluid Of Jinchiling Gold Deposit In Northwestern Jiaodong

Jinchiling gold deposit is a typical quartz vein type gold deposit in northwestern of Jiaodong peninsula.The ore body is controlled by faulted structure which is called Caotougou fault.The article utilize the basic theories and methods of mine field structure with detailed outdoor geological survey and indoor summarizes research.Discussed the features of faults and the process of structure evolution in the goldfield.Inversed the tectonic stress field of this region and then summarized the tectonic ore-controlling rule.Combine tectonic with fluid to research the coupling mineralization of tectonics-fluids.The main conclusion and knowledge obtained as follows:(1)The specialty of faults in mine field is multi-stage tectonic activities.Analyzed by fracture kinematics evolutionary sequences in mine field and structure rock stress in fault zones,and combined with the statistical results of joints to make a conclusion of tectonic stress field in Jinchiling gold deposit is NW-SE extrusion-NE-SW extrusion-NW-SE extrusion.(2)By discussing the tectonic stress field of the main metallogenic period,the tectonic setting of Jinchiling gold deposit,and the northwestern of Jiaodong peninsula goldfield is Mesozoic tectonic regime transformation and the large-scale lithospheric thinning,and the northwestern of Jiaodong peninsula unique strike-slip and normal-slip compound mineralizing tectonic system resulted from a large scale into the northwestern of Jiaodong peninsula mineralization period.(3)Based on the tectonic zone ore body observation and tectonic analysis,we identified the tectonic ore-controlling regularity.In the plane,the ore body thinning out,nearly SN and NE of mineralization ore body transition to the direction of principal compressive stress is in favor of mineralization.In the section,the dip angle of SN and NE ore body becoming large is in favor of mineralization.Ore bodies distributed in a lentoid shape in favorable tectonic position of the fault zone.P4 vein on lateral trending direction,downwardly there is still great extension,indicting great prospecting potential.(4)The mineralization of Jinchiling gold deposit can not be separated with tectonic and fluid.This article discussed the coupling mineralization of tectonics-fluids.The cause of Jinchiling gold deposit is fluids pressure drop in tectonic zone during the conversion period of tectonic stress field which bring about fluid boiling and then lead to physical chemistry parameters change in fluids.Au dissolve out precipitation in suitable physical and chemical condition.(5)Discussed the thermal events of tectonic-fluid and seted up a structure-alteration-mineralization space structure of Jinchiling gold deposit.