| Molybdenum as a national important mineral resources, an important raw material forthe steel industry is an important additive alloy and stainless steel, with the rapid developmentof the national economy, demand for molybdenum is increasingly looking to develop new andadequate resources seem molybdenum particularly important.Former East Qinling molybdenum belt for more research, and less research for thecentral of South Qinling molybdenum mine, research molybdenum mine out of East Qinlingarea for the rich country molybdenum mine production and researchwork is particularlymeaningful. In this paper,the molybdenum of the study area were researched. Detailedgeological field surveys, data compilation seriously and microstructural observations, themain and trace test indoor. Using of structural geology, geochemistry, petrology, structuralpetrology, microscopy structural geology in geological features, petrogenesis, tectonic setting,ductile shear zone and its effect on the control of molybdenum of the study area wereresearched system. Mainly by the following understanding:(1) Reading a lot of previous literature, combined with geological field surveys, regionalgeological features, mining geological features, geological characteristics of ore, thegeological characteristics of output of molybdenum mineralization and alterationcharacteristics, the analysis of these considered the deposit is the type of considered byductile shear belt control of post-magmatic hydrothermal vein-type molybdenum ore genesis.Host rock is zhashui rock, ore mainly are quartz veins containing ore, occurrence of quartzveins is more stable toward NE-SW direction, inclination of about50-70°. The forms ofRock is a generally elliptical distribution NNE direction, an area of about264km2, Types ofzhashui rock is major adamellite, zhashui rock were formed in the late of Indosinian(2)A ductile shear belt in the study area is determined.It expose in the middle of thestudy area, outcrops on the surface is larger, the west of ductile shear belt adjacent tostrike-slip faults F1,the east of ductile shear belt adjacent to the Fault of hougou F3. Length ofit is more than3km, width is generally0.9km, widest is1.3km, the narrowest is0.7km;overall tendency is300°~315°, angle changes at50°~70°, either along strike or tendency itis soothing wavy. Through field investigation and laboratory analysis for a more detailedstudy of its geometry, kinematics, dynamics. The main characteristic of ductile shear belt: theright line pressure shearing shearing based, local dextral tenso shear late evolution to becomebrittle fault. Orientation of the maximum principal stress σ1≈310°60°, ancient stress value is81.975Mpa. flinn graphic display, strain type of ductile shear belt is based offlattening, the length of the shaft by graphic calculations show ductile shear zone along theX-axis strain ellipsoid has stretched.(3) obtained by Major element analysis,the rock chemical of zhashui rock with highsilica, alkali-rich, multi-potassium, depleted of sodium, magnesium, calcium and otherfeatures. In the diagram of SiO2-(K2O+Na2O), all of rock category are granite. In thediagram of SiO2-K2O, rocks are high-K calc-alkaline series.The total REE of rocks is high,between light and heavy REE fractionation strong internal LREE HREE fractionationinternally weak,showed significant negative Eu anomalies. In the chondrite-normalized REEdistribution curve, the sample showed a significant right-wing type, that LREE enrichment. Inthe chondrite-normalized REE distribution curve, the sample showed a significant right-wingtype, that LREE enrichment. From the curve can be seen REE curve of ore consistent withZhashui rock xichuanjie unit adamellite and granodiorite REE curve, indicating a mineralsource for zhashui rock xichuanjie unit. Primitive mantle normalized trace elements in therock high field strength elements is100to1000,various rock types of micro-distributionpatterns are basically the same. On the multi-element partitioning graphs, Sr significant losses,Nd, Eu performance weak loss. Drawn from the analysis of rock genesis of Zhashui rockmainly K calc-alkaline rock series, rocks are mainly peraluminous small are whicheveraluminum,Zhashui rock is I-type granites, and the S-type granites evolutionary trend. Drawnfrom the analysis of the tectonic environment,tectonic environment of zhashui rock formationis the same collision environment,Zhashui rock were formed in the late of Indosinian,in thetime it was Intracontinental orogenic stage.The analysis match the Intracontinental orogenicstage.(4) Studyed area Zhifanggou molybdenum ore body in zhashui rock, ore strictlycontrolled by granite, ductile shear zone control, granite provide source of minerals, activityof ductile shear belt deform metamorphic rocks, provide the impetus for the revitalization andenrichment of Mo, Ductile shear belt provide a migration path for enriched containingmolybdenum hydrothermal,it is guide structure of ore, ductile shear belt formation of variousfractures, especially fractures of D provides the precipitation space of hydrothermal ore,become rich integrated mine location, became host structures of molybdenum mine, andultimately the formation of many quartz veins containing ore. |
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