Research On The Weijingsumu Tourmaline Deposit In Siziwangqi, Inner Mongolia

A systematical study has been carried out on the Weijingsumu tourmaline deposit in Inner Mongolia, with a focus on its mineralization, geological conditions, tourmaline mineralogical characteristics, genesis and resource evaluation.38 orebodies can be defined in the deposit according to the content of tourmaline≥15%. The majority of them exist in the transition part of metamorphosed tuff to dolomitic limestone in the Xinwusu formation of the Jiangan group of Lower Permian. The orebodies concentrate in core of the Xili Temple syncline fold, north-west wing Chaganhada anticline, top of Elidengchagan and the direction of them parallel to the stratigraphic distribution.Component analysis shows that B2O3 is positively correlated to MgO, Al2O3, but negatively correlated to SiO2 and CaO. Al, Mg are relatively rich, while Si ,Ca are poor in mineralization substance. Trace element analysis displays that the large-ion tourmaline stone elements and the elements of deep is depleted. The ratio of (La/Yb)N, which ranges from 0.41 to 8.74, is high-shaped;δEu, from 0.48 to 0.93, is slightly negative anomaly; normalized distribution patterns curve, with light REE enrichment, is right inclined. Symbiotic quartz inclusions in hydrogen and oxygen isotope analysis exhibitδD, between -82.65 and -97.88, is close to the magma waterδD (from -80% to -40%). Various types of ore appear tuff layer of the residual structure through slice observation. Generally, it reflects that the tourmaline deposits result from the hydrothermal transformation after volcanic sedimentary.Chemical analysis of tourmaline single mineral shows that the ratio of MgO/(MgO+FeO) rangs from 0.47 to 0.75. The parameters of tourmaline unit cell are a=15.973 ?, c=7.221 ? and V=1595.4417?3 through phase analysis. Both of analysis indicate that tourmaline in the deposit indulge in dravite, which belongs to schorl-dravite series. Tourmaline samples of 105μm particle release 42/cm3 anion and the sample coated by aluminum powder retain volume resistivity of 1.55×108?.cm. The experiment's result shows that the tourmaline plays excellent performance on anion release and electromagnetic shielding.Based on experience, economic analysis and statistical analysis, the thesis determine this work area's boundaries grade of tourmaline deposit for tourmaline mineral content is beyond 15%; By the contrast of project, 20% tourmaline mineral content is the minimum of Electric Industrial grade quarry. The reserves of ore resources, with <334> economic forecast, are 3.09 million tons and tourmaline mineral amount to 1.33 million tons. Moreover, the possibility of deep seabed boron prospecting in work area is put forward and prospecting clues of sedimentary manganese ore bed are discovered.