Deep-penetrating Geochemical Research On Shenjiayao Gold Deposit

Shenjiayao gold deposit is located in the Xiaoshan district.It is one of the representative structural rock type gold deposits.Most of the mining area is covered by the Quaternary eolian loess.The pollution level around the ore district is relatively low.Therefore,this area was very suitable for conducting deep penetrating geochemical study.In this paper,detailed deep penetrating geochemical research was carried out in Shenjiayao gold deposit.This study can not only provide a theoretical basis for deep-penetration geochemical exploration of concealed ore deposits,but also be helpful to the further prospecting deposit work in this area.The interpretation of the deep-penetrating geochemical anomalies should be carried out according to the characteristics of deep ore bodies.Therefore,we studied the geological and geochemical characteristics of this deposits at first,including the ore and mineral characteristics,metallogenic stage division and fluid inclusions characteristics in Shenjiayao gold deposit.In this study,the temperature of mineralization was measured by fluid inclusion studies,and the ore-forming pressure of gold deposits was estimated by correlation formula.This study has carried out a deep penetrating geogas measurement experiment over the concealed deposit.The spatial distribution characteristics of each element were studied by foam and aqua regia media in the geogas measurement experiment.The results show that both the foam and aqua regia media can reflect the deep mineralization,and the geochemical anomalies of Au are obvious,and Cu,Pb,Zn and other mineralization associated elements show obvious abnormalies.The trend of the abnormal spatial distribution of elements in geogas is consistent with the ore body direction and the trend of regional tectonic line.In general,the application of geogas measurement in the loess coverage area has achieved good results.To explain the anomalous source of deep-penetrating geogas measurement,the characteristics of rare earth elements in the geogas samples and ore samples,the composition characteristics of elements and the ratio of elements are compared.The results show that the geogas and the ore rocks are both light rare earth enrichment type,and they have similar rare earth elements distribution model.Geogas,ore and minerals have a similar Au/Ag value,and the content of Cu,Pb,Zn elements are highly enriched.Therefore,the geogas and ore have homology,and the abnormal source is the deep ore body.In this study,it is confirmed that the material form of deep-penetrating is nanoscale particles.The nanoscale particles are collected from geogas over the deep ore body.Transmission electron microscopy analysis shows that these particles contain elements of metallogenic significance.They could migrate from deep ore body upward to the surface.They are the deep-penetrating anomalous transfer material.