| Yunnan Dahongshan Iron copper deposit is located in the southwest of Yangtze metaplatform and Kang Diantie copper multi metal metallogenic belt of Southern important part, Kangdian axis is concentrated in China an important element of ancient Zhoutie copper deposit distribution area, over the years is considered to be the IOCG deposits. But due to the weak basic research, typical analysis, the mechanism and related metallogenic time has not yet formed rules of understanding. So choose, Kangdian axis is larger for ore prospecting potential of Dahongshan region to carry out the study of iron and copper deposits, the tectonic and metallogenic relationship, provides the theoretical basis for the mining area depth portion and the periphery prospecting, at the same time as the Kangdian axis of IOCG deposits research provides a typical example of support.This paper is based on the project of Li Jun in Xinping, Yunnan Dahongshan Iron ore deposit, mineralization regularity and the deep prospecting prediction research" project under, many deep tunnel and surface sampling and gallery catalog work. And completed the a large number of field geological investigation and sample treatment and laboratory research, and in accordance with the provisions of the school submitted a research proposal and thesis. In the previous research results of Dahongshan region and on the basis of mine field and underground investigation and laboratory analysis, combined with the knowledge of the basic theory of structural geology, from the mining regions and folds, faults and volcanic edifice, stratigraphic contact relationship, intrusive rock and other aspects of research on the relationship between tectonic and metallogenic, understanding the main results of this paper are as follows:1. Mine main ferreous layers of Hongshan formation of sodic lavas and copper main ore bearing horizon is sodium tuff man Gang River group, Proterozoic ancient as the main metallogenic period. In the Paleoproterozoic, marine tholeiite intermittent eruption and effusion, the formation of submarine volcanic eruption sedimentary rock series, man Gang River late mantle heat flow forming hydrothermal exhalative sedimentary and formation of iron and copper belt, shale and carbonaceous containing carbonate clip carbonaceous and clay containing iron and copper carbonate (siderite belt with iron and copper-bearing volcanic grey matter. In different mineralization stages, the structures are involved, which controls the output of the ore bodies.2. The structural system of the mining area can be divided into four phases:the first phase of the East and west to the structural system, formed in the north and south direction of the extrusion environment, the formation of time for the Longchuan period. The second period of the early North and south to the north and the east to the structural system, formed in the East and west of the extrusion stress derived from the local Zhang Yingli environment, the formation of time for the Jinning period. The third phase of the North West to and late EW tectonic system, mainly due to the role in Ailaoshan structural belt and the red river deep fault influence the formation time of Yanshan period. The late north and South trending tectonic system in the fourth phase, which is the change of the left lateral torsion in the North West trending tectonic system.3. Tdentify the relationship between tectonic period and mineralization of the main. The first, the second and third stage and mineralization has a close relationship, the first phase of the things to the mining area of the basement structure plays an guiding mine (such as faults F1 and F2) and host (such as bottom Batu anticline, red Cristo inclined) role. The second phase of the ne structure of ore enrichment has obvious effect (280,340 Middle East North fault near the orebody rich ore, better), which belongs to the ore structure. The third phase of the NW structure mainly for breaking the ore structure, integrity and continuity of the impact on the body.4. The relationship between stratum contact zone and mineralization. Man Gang River group of the third and fourth rock section of the contact parts of the control of the output layer of No.1 Iron Copper, Hongshan formation first and second rock section contact with control ? copper and iron ore output, Hongshan formation and man Gang River Formation volcanic rocks in contact near ? 1 ore rich parts of the strongest. Contacting of Hongshan formation and the upper section and the Hui Long diabase, dolomite sodium feldspar of belt and its nearby for V 2 shallow ore bodies in the output layer.5. The relationship between diabase gabbro and mineralization. To destroy the orebody of continuity and matches the ore and rich ore body. The intrusion of diabase gabbro. The original ore body of cross partition with diabase gabbro, destroying its continuity, but at the same time due to the diabase gabbro and magmatic hydrothermal fluid in the mining area become sodic rocks, early period of diabase gabbro occurred sodium and precipitation of iron, of the deposit produced eutrophication. Such as the formation of IV ore bodies.6.The relationship between volcano and mineralization. Volcanic activity center control whole ore belt (?, ?, ?, ?, ?, ?, ? of ore band) formation and distribution, or close to central eruption or eruption center distance slightly far more volcanic cone, or distribution between the crater of a volcano in the concave region. The volcano eruption center to turn thin orebody, and the changes of iron and copper ore.7.From the contour maps of TFe and MFe in the middle of 280m,340m, and 370m, we can see that Fe is mainly distributed in the northeast and northwest, followed by the east and the west. Fe is controlled by faults. The ore body plays a role of enrichment, and the NW-trending fault plays a role of depleting and destroying the ore bodies. The overall Fe content is high, and the MFe ratio in the vicinity of the contact zone of the diabase gabbro increases. The diabase gabbro A certain enrichment. Fe orebodies are controlled by strata and distributed in the formation of Hongshan Formation... |
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