The Geochemical Anomalies Data Processing Of1:50000in Tibet Ta Erma

The key of exploration geochemical data processing is how to found the geochemicalbackground average date and anomalies reasonable regions。It is aimed at found chemistryinformation related mineralization from a large number of measured and raw date。Due to thereasonable regional geochemical background values determine the problem, sometimes abnormalinformation is concealed In actual prospecting, It is resulting in abnormal areas of lowbackground values can not be traped. However, the value of the low background region is alsoabnormal. This paper will focuse on how to trap a low background value of regional geochemicalanomalies.This is the first use of the geochemistry of mineralization in the energy field to trap the Tibet theTa Erma region of lead and zinc geochemical anomalies, Compared with several other dataprocessing. The geochemistry of mineralization of the energy field in the region is more suitablefound in traps abnormal contrast. Mainly include the following:①geochemical the mineralized energy field variation function as the basic tool, not only toconsider the correlation of the geochemical data is also considering its randomness;②The geochemical data using variogram The spatial structure and spatial distributioncharacteristics of the delineation of the abnormal sphere of influence;③especially geochemical mineralization in the energy field in areas of low backgroundvalues can reflect the mineralization, the exception information. Geochemical anomaly map.④exception classification combined with the background image, further reaction of theabnormal areas of high background values, it is important to hook draw the exception of areas oflow background values.Use of the variogram curve fitting the energy of the Ta Erma regional Pb-Zn, indicating that:①Tibet Ta Erma region the presence of lead and zinc "nugget effect".②lead and zinc of energy variation of the value of the function of the base stations in alldirections, but sill than the measured lead and zinc content is small, reflecting the weaker of therandom phenomenon of the "nugget effect" of lead and zinc, lead and zinc of the spatial structureis very strong;③lead and zinc variogram is not the same value in each basis-Taiwan, show that lead and zinc of the space was "strip anisotropic structure;④Variogram structure fitting of observed in all directions, can be drawn from the directionof abnormal distribution of lead and zinc in the region is basically the same exception the overallsphere of influence. Lead the overall structure of the fit range was4.22Km zinc the overallstructure of the fit range was8.44Km. This indicates that the zinc than the scale and intensity oflead mineralization. Also in line with the actual situation of the study area, lead and zincaccompanied by students.From geological, metallogenic geological conditions in the area is simple, with seam-bitmainly distributed in the Ordovician limestones, Neogene Wu Yu group thin-medium-bedded finesandstone, Cretaceous get group andesite, dacite rock folder basalt and a small amount ofpyroclastic rocks, thin-thick-bedded micrite Devonian thick-thick layer of microcrystallinelimestone, exposed tie to carry the group metamorphosed argillaceous siltstones. Mineralizationtype of hydrothermal Pb-Zn and fractured altered rock type. This is consistent with the use ofchemical mineralization in the energy field of the trap mineralization range.Combined with the geological actual mineralization of the area forecast, It can be obtained asfollows Prospecting:Traps abnormal area of four lead and zinc levelⅠ, two level II exception,, three level IIIanomaly area.