The Experimental Research Of Deep-penetrating Geochemistry In Gobi Areas

In China,arid desert and gobi coverage areas locate in the west of Helan Mountain,the north of the west Kunlun Mountains?Altun and Qilian,with total acreage of 2.1 million square kilometers,about 22%of China's land area.Although this areas are vast,we do not have enough effective detection method for prospecting work.V210 of the Jinwozi gold deposit is a typically blind shear zone gold deposit in the gobi coverage.The thickness of the overburden ranges from 5-22 meters.So it is a good place for the test of deep-penetrating geochemical exploration.In the coverage,the zonation of Au and other elements associated with mineralization as "C" shape.In the research of the soils,the fine-grained level have the high clay content and Au content.MOMEO and geogas method focus on the fine grade of clay minerals.At the surface depth 0.1-0.3m,the Au anomaly appears fairly large,which accurately reflects the information of the mineralization in the deep.The geogas test on the 210 blind deposit shows obvious multi-element anomaly in the area.Au and other elements anomaly are seen on the coverage of the deposit.The anomalies in the line 1 and line 4 are significant.At the surface On the top of the deposit and the contact zone,Au anomaly occurs with Cu?Pb?Fe?Zn anomalies.In the two different medias,the combination of elements are different.It shows that two medias have the different trapping ability for different elements.Special media is used for trapping the fine-particles in the soils and geogases.The observation indicates the existence of nanoscale particles.Au is found in the bigger fine-particles.we also found the Fe0 in the geogases,which could not exist in supergene conditions.The only possible reason is that the rapid migration of Fee from the ore body to overburden.The Fe provides a very convincing microscopic evidence for geogas method of the deep-penetrating geochemistry.The fine-particles in geogases can be divided into two groups:one is the Cu.Fe nanoscale particles with small particle size and small quality;the other is mineral debris and bigger nanoscale particles with large particle size and large quality.Au contents in these two particles are different.The two medias have the different trapping ability for different particles.More Au exist in the second particles because of its own characteristics.Due to their own differences,zoning phenomenon are shown in the coverage on the doposit.