Of Liaoning Province The Paishanlou Gold Geochemical Characteristics And Metallogenic Prediction

Paishanlou area is located in north of raised Beizhen of Yanshan single fold belt and western Liaoning platform subside, which belong to north margin of Zhongchao sub-platform of North China platform. With the well-developed Archean strata, magmatic activity is frequent and intense in the area, which is passed through by Fuxin-Jinzhou fracture and the ductile shear zone of Daba to Houshanjiaoshan. De to the complicated geological conditions, the ore-forming conditions is superior.Paishanlou gold deposit was discovered in 1988 by Regional Investigation Team of Geology and Mineral Resources Bureau of Liaoning and was built up in 1997. The cumulative amount of proven gold resources is 17 million tons, with 2.7 g/t of the average grade and 43ts of metal quantity. At present, the proven reserve of the deposit has been depleted, facing bad resource crisis. Comprehensive study is carried out about the promising area in the paper. Through the study of Paishanlou gold ore deposit region, mining area geology, deposit geology, and ore geochemistry characteristics, we summarized the ore genesis and metallogenic model and redefined the ore-controlling factors and prospecting criteria, applying space analysis function of GIS to mining area and peripheral to carry out the synthetic information mineralization prediction. The mainly information the paper got is as following:(1) Integrating previous research data and fieldwork, we find that JianPing group of Archean is the most favorable horizon of ore-controlling of gold ore; Sulphur in ore originate from archean metamorphic rocks; Lead in both gold ore and archean metamorphic rocks comes from deep crust; the chart of portioning model of rare earth elements indicates that the characteristics of the ore of gold mine deposit in Paishanlou are consistent with those of archean metamorphic rocks, but differ from Yanshan granite largely, showing that gold ore comes from archean metamorphic rocks instead of Yanshan granite.(2) On the basis of summing-up and analysis previous research results richly, we selected the prospecting criteria as variable, including strata of JianPing group of Archean, archean metamorphic rocks, ductile shear zone, chloritization zone, iron dolomitization, pyrite-sericitization, medium precision of measured magnetic abnormaly and geochemical anomaly of Au, Cu, Pb, Zn, As, Sb, and Bi element, then retrieved the signs of ore-controlling factors, metallogenic condition, metallogenic information which all favour of mineralization via query function and retrieval function of GIS system, carrying out space superposition and comprehensive function to fix on the location of combined favorable information. Furthermore, we carried out the prediction and appraise of mineralization and found four ore-forming favored target zones, including target areas of south Donggou of Paishanlou,west Aobao, Zhaizigou-Shimengou-Nangou,and east Jinjiadian-west Shangcaoheshanggou. Delineation of target areas has practical significance to gold deposit increasing storage and sustainable development of Paishanlou.