The Structural Characteristics And Ore-controlling Structure Of Jieke Gold Deposit Which Locates In A Ba, Si Chuan

The Jieke gold deposit located at west of Qinling orogenic belt, and is in theMaqu-Lueyang deep fractured zone of Songpan-Ganzi fold system, southwest ofmiddle Ruoergai. It is a typical slightly infected deposit in recent years, which iscalled Carlin Type Deposit. The Jieke, Manaoke and Dongbeizhai gold ore depositsare the gold enrichment region of our “Gold triangular region”. Even though the gradeof this kind of gold ore deposit is a little low, the scale thereof is very large. Recently,people has paid more and more attention to the researches of the metallotectonics.This thesis analyzed the metallogenic model, ore-controlling condition andprospecting criteria,etc through the geological characteristics, ore-control structure,etc. Also carried out the geochemistry and geophysics work on the mining area, anddiscussed their relationships with the structure. It has several main contents:1. Discussed the geological characteristics of the mining area and the ore deposit.Suggested that the quartz diorite porphyrite of highly limonitization, the siliconization,the carbonation and the sericitization in the fractured zone formed from theeastwestward faults and northwestward faults, especially the tectonic breccia is agood prospecting criteria. Orebody is determined by the fault of the mining area.2. Discussed the relationship between the fault scale and ore deposit sacle.Suggested that the F4fault of this mining area is the major ore-hosting fault. Duringthe main metallogenic period, it should be at the tensioned period which has a goodaccommodation space. The fault scale thereof effect the orebody scale directly.3. Discussed the relationship between the mineralization zoning and the faultdistribution. Suggested that the F1fault of this mining area was the major conductingand blending fault. The F2, F3, F4, F5were secondary fault. The main faultdistribution determined the gold ore mineralization zoning to present as horizontal zoning. That is changed gradually from the altered rock type of the F1major faultzone to quartz vein type by away from the major fault zone.4. Discussed the relationship between the geochemical anomaly distribution andfault zone. Suggested that the fault has a strong influence on the geochemical anomaly.And the comparatively study of the geochemical section and the geological sectionshows that the position of the fault fault zone has a corresponding relationship withthe outliers of high content of Au.5. Discussed the relationship between the geophysical anomaly and the fault.Suggested that the self potential appears as a weakly abnormal type. The negativepotential is at the corresponding side of the fault zone. The transition zone of highapparent resistivity turning to low apparent resistivity corresponded to the fault. Thehigh abnormal parts of apparent chargeability corresponded to the fault.6. Discussed the metallogenic model of this gold ore deposit. Suggested that thesource bed was the triassic sedimentary stratigraphy. The heat source was themagmatic hydrothermal activity of the Yanshanian intermediate-acid magrnatism. Thehydrotherm is mainly from the atmospheric water, the formation water and themetamorphic water.