The Northern Qaidam Basin Metallogenic Belt, Remote Sensing Information Extraction And Favorable Metallogenic Prediction

There is abundant mineral resource in north margin mineralization belt of Chaidamu Basin and some of them have been found. But there also exist obvious remote sensing image abnormal along with geophysical and geochemical exploration abnormal as a result of copper, lead, zinc and gold polymetallic deposit. Part of these abnormal had been verified by bore hole and large mine have been disclosed. So there are big potential to find new mineral resource in this area.Along with the development of the hyperspectral remote sensing technology, one way of regional mineralization information extraction has been formed. That is test the spectrums of the different altered mineral using subdivision optical spectrometer and analyze these test data, then determine the best band combination to extract the information of mineralization and altered mineral from ETM space image.Guide by the newest research achievement and the mineralization theory of the geosciences. The author based on the known geology, mineral deposit, geophysical and geochemical exploration outcome, by means of remote sensing image processing and analysis, farthest extract information of mineralization and mine-control stratum and geological structure, research the association characteristic of the linear structure, circular structure and block structure and their relationship with the mineral, and the relationship between crust deep structure and the mineral resource. At the same time, analyze the main mineralization and alteration information in known mineral deposit or mine spot, research the spectrum of the main alteration mineral, find their identify indication and form the alteration extraction technology. Farthest extract the mineralization and alteration abnormal information, via geology analysis, chose the optimization target to investigate and verify. Resolve the cause of formation in remote sensing mineralization and alteration abnormal, sampling and test the abnormal that have close relation with the mineralization. Go on with the test result, summarize the remote sensing geology factor that control mineral formation and the rule of the mineral deposit preservation. Establish the synthetic mineralization model for remote sensing exploration and predict the advantaged mineral formation area.By analyze and sum up the geological characteristic, mineralization condition, mine distribution rule, combine with remote sensing mineralization information extraction, geophysical and geochemical exploration outcome, after general evaluation, predict five mineralization Perspective areas. They are Wangbeigou Au-including quartz vein and structural altered type mineralization Perspective area, Hongdengou structural altered type Au mineralization Perspective area, Wangdonggou structural altered type Au, Ag, Cu mineralization Perspective area, Dulonggou Au, Ag, Fe mineralization Perspective area, Dakendaban Mountain Au, Ag mineralization Perspective area. These discover provide the scientific proof and base data for dispose work area and find the target in the further mineral exploration.Multi mineralization information analysis and field investigation and verify shows that remote sensing mineralization and alteration abnormal provide the important proof for the geological exploration. But because the ETM image now we use has wide wave range, image is extremely complex. This take some difficulty for the remote sensing mineralization information abnormal extraction, the mineralization and alteration information we obtained from the remote sensing image can not show directly the existing of the mine deposit or mine spot. The author use field alteration mineral hyperspectral test, plus mineralization and alteration information combination extraction, plus known remote sensing, geophysical and geochemical exploration, geology, mineral deposit achievement, to do multi factor synthetic evaluation of mineralization prediction. This method have acquired perfect effect in north margin of Chaidamu basin. This technology has the advantage such as fast, economy, high efficiency in filtering the exploration target. The Perspective area produced by remote sensing method have the advantage of high probability to find mine deposit and can be a new technology to spread for the exploration in west big mineralization belt.