| Qinling Orogenic Belt is the most important one in China which studied in high degree.For a long time, there’re many different understanding of the researchers on its tectonicevolution. To these different understanding, researchers not only formed inside the Qinlingfold belt tectonic-magmatic hydrothermal activity-deposit formation model, the dividingline between the limit and the study of science and technology personnel to the Qinlingcomplex geological tectonic environment and metallogenic model of the interpretation and theidea of looking for mineral deposits and the method of innovation. Nowadays, Qinlinggeological problems continuously detailed geological investigation and indoor research workand research methods in recent years, increasingly progress, encourage people in perfectunderstanding of Qinling orogenic belt mineralization at the same time, also in prospecting,mining, and protect the Qinling ecological environment of the new way.Sanyo-ZhaShui ore concentration area is one of the main ore concentration area ofQinling orogenic belt, the sedimentary accumulation in the material for more Liulingqungroup and small thickness of the carboniferous valley river deposits. Liulingqun stratigraphiclithology of overlying devonian series tung valley temple group and the donggou, below thedevonian series ear of Sichuan, pond ditch and bluestone (group, sedimentary environment isbelong to the marina neritic facies estuary delta facies sedimentary matter underwaterenvironment, at the same time, two valley and the tung valley temple group the combinationto form Cu-Fe mineralization zone of skarn type main orebody of surrounding rock strata.Mineralization zone fault development, develop together in the fracture structure usuallywhere small or concealed rock mass. Small area of Mesozoic magmatic activity of neutral andacidic (spot) rock body (vein) in rock, rock strain, tumor, tubular, visible part of the rock massperiphery explosive breccia.In this paper, the study area, Xiaohekou mining area is in the heart of sanyo-ZhaShuipolymetallic set. On the geotectonic belong to the north rim of Qin Lingwei plates, clampingin sanyo-phoenix town fault and dealer Dan fault, at the bottom of the base rock,sedimentary basins by volcanic island arc complex rock mass and sanyo areas of northernqinling orogenic belt mainly formed by the tectonic fracture system in the geological history of migmatization rocks coexist in the same geological environment. Area there are a largenumber of secondary fracture, and developed a large number of Mesozoic acidic-in acidicporphyry. Good tectonic environment and active magma activities, to create the extremelyfavorable metallogenic conditions, also causes the complex diversity of the combination typeore deposit.Of surrounding rock in the study area is mainly under the same group and the group ofpolymetallic, donggou original relatively high abundance of widely disseminated pyrite,pyrrhotite, when various types of small rock erosion occurs, the hydrothermal alteration,mineral metasomatic etc, to form more metal minerals.Sanyo-phoenix town fault zone, as the regional deep fault, control of the area on itssedimentary facies and rock geochemical characteristics on both sides, is a synsedimentaryfaults. The fault tectonic deformation is relatively complex, has the characteristics ofmultiphase tectonic deformation, causing the geological tectonic environment in differentregions, different mineral rock, metamorphic rock deformation and two-tone differences, inthe geological environment, resulting in relative migration and diagenesis in the mineralcomponents of polymerization. In the vicinity, distribution of intermediate-acid rock mass andthe associated minerals, have been nearly east-west and north east to construct line control. Infold anticline and syncline axis between the rock and the turning end, is related to rockhydrothermal alteration prone areas. The location of the rock mass, the distribution of thesecondary small faults, controlling the geological characteristics of minerals in the studiedarea and position output.In the type of magmatic rocks closely associated with the distribution of the mineral.Diorite-granite, quartz diorite, monzonitic granite for weak acid small rock mass, thedistribution of copper with close relation; In the acidic granite rock class, molybdenummineralization possibility is larger; Iron or iron ore mainly appeared in the neutral rock mass,mainly for the diorite and quartz diorite, shows neutral rock formation of iron ore.From what has been discussed above, in the skarn type, porphyry type and other kinds ofmetal mineral formation, is by the formation, structure and magmatic activity of the result ofjoint action. |
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