Minerals Prediction Based On Caixiashan Lead-zinc Deposit By Integrating Geological Information In East Tianshan Area,Xinjiang Autonomous Region

East Tianshan area is an important metallogenic belt of nonferrous metal and precious metal, and also one of the sixteen important metallogenic regions of non-fuel mineral resources in China. There has complete stratum, multiform sedimentary formations, complicated geologic structure, frequent magmatic activities, obvious metamorphosis, long metallogenic history and ascendant mineralization condition. But, it also has relatively lower working density. The exploration breakthroughs have been made in recent National Land and Resources Survey. Caixiashan lead-zinc deposit, for instance have been found, which foreshows great potential in this area.Using the theory of metallogenic series and the deposit model prediction technology of integrated geological information, this thesis made a research on the prediction of the Caixiashan type strata-bound hydrothermal lead-zinc deposits in the small scale range of eastern Tianshan region. Since the key of this method is the selection of the multivariate geological information and the construction of the prediction model, plenty of geological, mineral, geochemical, geophysical, remote sensing and drilling data were collected and analyzed, and the metallogenic regularity and mechanism of Caixiashan lead-zinc deposits were clarified. The perspective target area was delineated and preliminary evaluation was made based on the mineral potential evaluation platform of MRAS, and a pilot exploratory study of geological information in the field of mineral resources exploration was carried out.The technical difficulty of the quantitative geochemical exploration in this thesis is how to identify and extract geochemical information effectively. To solve this problem, on one hand, the author made a research on the geochemical characteristics in three dimensions of orebody, mining area and mining region based on the measured profiles and collected geochemical scanning data. On the other hand, compared with ratio method and C-transformation method, moving contrasting coefficient method was taken to deal with the system deviation of the stream sediment data since it has a better application effect for As in the representative area. Instead of the traditional method which used the sample with highest value, nonlinear network was used in the extraction of important geochemical samples for the first time, and it was applied to the construction of geochemical predictor. Finally, another problem of this research is how to do small-scale mineral resource estimation referring to the discovery pattern of large-scale primary halos. Following the modern metallogenic theory and primary halos theory, this thesis established the intrinsic link between the deep primary halos mechanism and the surface geochemical tracers. It improved the traditional areal productivity by introducing denudation coefficient into the resource estimation.At last,39optimal prospective areas were selected out and total resource of lead-zinc of this style is32.88Mt estimated by advanced analogy method.