Soil Geochemical Anomalies Of Typical Metal Deposits In Heilongjiang Province

The region of Xing'anling in Heilongjiang province is an important non-ferrous metals mine area, which has a large prospecting potential, however, the area is the forest-swamp terrain and covering thickly, which led to the prospecting exploration ineffectively. Therefore, to enhance the technical methods of exploration about the special landscape areas, that is important prerequisite of launching the large-scale exploration work and improving the efficiency of exploration. This paper mainly studied some key technical issues of the soil geochemical survey in the metal deposits of the area; it includes the enrichment and distribution of elements accumulation in soil samples and deposits of different depth and grain size, characteristics of different deposits'elements, the combination of ore indicator elements and the best pitch of sampling dot. The analysis of the relationship of soil abnormal elements in different deposits and the mechanism of abnormal provides a scientific basis for the Large-scale soil geochemical survey and soil geochemical anomalies Screening and Evaluation.In the study, we acquired 739 soil samples which came from Xing'anling gold, molybdenum and lead-zinc polymetallic deposit in Heilongjiang province and 32 samples for X-ray diffraction analysis. After natural dried, the soil sample can be screened out 5~20 mesh, 20~40 mesh, 40~60 mesh and below 60 mesh, sample treat with soil geochemical surveying (DZ/T0145-94) implementation. Soil sample analysis completed by the Ministry of Land and Mineral Resources of Shenyang Supervision and Testing Center laboratory, Analysis projects are Au, Ag, Cu, Pb, Zn, W, Mo, Sn, As, Sb, Bi, Hg, F, Cl, Ba, SiO2, Al2O3, TFe, Mn, MgO, CaO, Na2O and K2O,analytical methods and quality accord to the relevant specifications and standards.The exception of the main element of DongAn gold field is more obvious in B and c of the soil layers. The content of the direct and indirect instructional elements in layer C is higher than B, but the contrast is lower. Au and Ag of known ore body in DongAn showed obvious exception and had a high exceptional contrast. In space, they are in the position of the quartz vein including ore, so they can be used for direct instructional elements. The exceptions of W and Mo in the soil were very obviously and the scale is large. They were also in the position of the quartz vein including ore and showed a content peak on the ore body. They can be used for the indirect instructional elements. The exception of As, Sb, Bi is obvious in the soil, and they were not only having a high exceptional contrast, and the size was also large. So they can be used for indirect instructional elements. For the Soil geochemistry survey of DongAn gold ore, we should select layer B of the soil, the granularity lever should below 60 meshes, and select Au, Ag, As, Sb, Bi, W and Mo as the instructional element. The space between sample points is 10~20m.The main elements of TaYuan Lead-zinc ore have a obvious exception in layer B and C. The content of the direct and indirect instructional elements in layer C is higher than B, but the contrast is lower. The exceptions of Cu, Ph and Zn in the soil were very obviously and the scale is large. They can indicate the position of ore body accurately, so they can be used as the direct instructional elements. The exception of As,Sb and Sn were obvious, the exceptional contrast was high, and wide than the ore-bearing fracture zone. It showed a content peak on the ore body. They can be used for the indirect instructional elements. The exceptions of W and Mo in the soil were also obviously but the scale is small, so they just have some reference to prospecting. For the Soil geochemistry survey of TaYuan Lead-zinc ore, we should select layer B of the soil, the granularity lever should below 20 meshes and select Cu, Pb, Zn, As, Sb, Sn, W and Mo as the instructional element. The space between sample points is 40m, which can find the exception economically and effectively and control the scope of the ore body.The main elements of XiaoXiLin Lead-zinc ore have a obvious exception in layer B and C. The content of the direct and indirect instructional elements in layer C is higher than B, but the contrast is lower. The exceptions of Cu, Ph and Zn in the soil were very obviously and the scale is large. They can be used as the direct instructional elements. The exception of As,Sb and Sn were obvious, the exceptional contrast was high, and the scale was larger than the ore-bearing fracture zone. Because on the ore belt have a special peak, they can be used as indirect instructional elements. W shows a obvious exception, the max content appeared in the sample points over the ore. But the scale was small, just has some reference value to direct ore body. For the Soil geochemistry survey of XiaoXiLin Lead-zinc ore, we should select layer B of the soil, the granularity lever should below 20 meshes and select Pb,Zn,Cu,As,Sb,Sn,W and so on as the instructional element. Within 80m distance between sampling points can be cost-effective to find anomalies and control the ore range.The exception of the main element of LuMing molybdenum field is more obvious in B and c of the soil layers. The content of the direct and indirect instructional elements in the layer C is higher than layer B, the abnormal contrast in the layer C is same to layer B. The exceptions of Cu, W and Mo in the soil were very obviously and the scale is large. They can be used as the direct instructional elements. As and Sb of known ore body showed obvious exception and had a high exceptional contrast. The scale of ore was large; the highest value appeared on the ore body. They are good indirect instructional elements. The exception of F in the soil was also obviously but the scale is small, so it just has some reference to prospecting, also can be used as indirect instructional element. Both Bi and Hg appeared the highest value on the ore body, but in space, they are not entirely consistent with the abnormal size of the main ore-forming elements. For the Soil geochemistry survey of LuMing molybdenum field , we should select layer B of the soil, the granularity lever should below 5 meshes and select Cu, Mo, W, As, Sb, F, B and Hg as the instructional elements. Within 80m distance between sampling points can be effectively to find anomalies and control the ore range.