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Geological Features, Mineralization Model And Prospecting Areas Of Tonglushan Cu-Fe-Au Deposit, Southeast Hubei

Posted on:2006-01-15Degree:DoctorType:Dissertation
Country:ChinaCandidate:G MaFull Text:PDF
GTID:1100360182468671Subject:Mineral prospecting and exploration
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In this thesis, guided with the regional metallogeny theory, started from the geological properties and the mineralization-controlling structures of Tonglushan ore deposit, we researched and compared the characteristics of Skarn and cryptoexplosive breccia ore-body from their trace elements, REE, stable isotopes and fluid inclusions. The origin and cause of metallogenic matter were discussed. The author set up the ore deposit metallogenic model, summarized the metallogenic rule and figured out the areas for next mineral exploration. The main innovation and new viewpoints are summarized as following:1 , Through the research of regional metallogenic background, it is regarded that both of Indosinian and Yanshan orogeny controlled the magmatism and metallogenesis in Tonglushan ore-deposit area. During the Indosinian Epoch, NW-NWW-striking faults and folds were formed. In the Yanshan orogeny Epoch, the tectonic process not only altered the existed structures of NW-NWW-striking, but also added the NEE-striking structures. The superposition of NNE and NWW structures controls the stock position of granodiorite and the output of ore deposit. The ore-body was controlled by structure formed later. The intersection space of these two group of structures is favor of the produce of bouanza.2, From the point of mine field, the relation of Tonglushan ore deposit and the periphery deposits such as Jiguanzui, Taohuazui, Liyuzui and Shitouzui was researched. It puts forward the point of that Tonglushan ore deposit lies in central zone of mineral area and "huangshi hotspot" of east of Hupei. The ore deposit has many mineralization types, the biggest mineralization intensity. The ore deposit has a exploration prospect of giant-deposit of Cu-Au ore deposit for the first time.3, From systemic survey and research on tunnel and surface, It founds that the primary number XI skarn-type ore body and it's surrounding "barren rock" actually are cryptoexplosive breccia ore-body of Cu-Au. After skarnization it experiences cryptoexplosive brecciation and follow a goldzation. Eventually the "barren rock" become cryptoexplosive breccia Cu-Au ore deposit. The mineralization wascontrolled by the NWW-striking faults and cracks belt. The large ore-bodies usually in the intersection sets of NWW and NNE structures, especially.4n With the detail research in the tunnel of -305m, we found minette vein concentrating Cu and accompanying with cryptoexplosive breccia. The vein formed after cryptoexplosive brecciation and also was controlled by the NWW cracks. The finding of minette porphyry copper ore deposit proofs the existence of "huangshi hotspot" and reflects the existence of intense crust-mantle metallization.5^ By the research on the mineralization-controlling structures, it was found that there were many NWW fault-crack belts. In the deep of these belts (-300m~-600m in elevation), there existed fractured rock, pyrite and chalcedony, etc formed by hydrothermal mineralization middle-low temperature. The gold and copper all reached the industrial standard. These fault-crack belts has same geologic and metallogenic environment as the XI ore body. It enlarges the exploration space in the zone.6> With the geochemical analysis of isotope (H> O> Sr> P^ S), REE, trace elements and the fluid inclusions, it has proved that the metallogenic fluid was mainly from the magma and meteoric water added later. And the mineralizing elements were mainly from the deep (sub-crust or upper mantle), part of them from the source bed. It figured out the mechanism of the metallogemy is: the mineralization elements circulated and extracted with fluid driven by the magma, and deposited at appropriate zone. The process of mineralization can be sum up as: first the skarn-type Cu-Fe ore-forming, then concealed-crack breccia, Cu-Au mineralized, the minette porphyry copper deposit formed at last.7 ^ Through the research of geochemical geology, the author expatiated the space-time relation and cause contact between Skarn Cu-Fe and Cryptoexplosive breccia Cu-Au ore deposit. Basing on the existence of minette and companied cobalt, it was concluded that the Tonglushan ore deposit is the outcome of crust-mantle mineralization. And their mineralization model was founded.8> By research of datum, geology survey, synthesis mapping andanalysis of test result, author summarizes the mineralization rule and the exploration indicators, founds the exploration model, forecasts the output of blind marble belt and mineral belt with analyses fold-faluts superposition and brings forward 7 target areas and 2 prospective areas. The part of these areas have been proved by practice.
Keywords/Search Tags:porphyry Cu-Au ore deposit of Cryptoexplosive breccia, Skarn -type Cu-Fe ore deposit, geological characteristics, metallogenic model, Tonglushan ore deposit
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