The Research Of Romote Sensing Abnormity Extraction And Metallogenic Prediction Models In Shimian And Mianning

As for mineral resources exploration technology gradually cannot meet the social needs, exploration of new deposits prediction technology will become the focus of national scholars to research. Contemporary metallogenic prediction is a collection of geological work, remote sensing, geophysical, geochemical and other disciplines into a complex multidimensional nonlinear analysis process, guided by the scientific prediction theory and geological metallogenic theory, mathematical statistics method to realize comprehensive treatment of multidimensional data, analysis of metallogenic conditions, summarizes the metallogenic regularity and metallogenic prediction model was constructed, delineating metallogenic prediction target. Remote sensing geology prediction model is the main component, is also the focus of the study. Geological structures are included in the remote sensing anomaly extraction, alteration anomaly extraction and temperature anomaly extraction, among them, the alteration anomaly extraction work has always been a difficulty and a focus of remote sensing geology.The study area is located in Sichuan Shimian- Mianning region, located in the Longmenshan Jinpingshan orogenic belt in the middle, west of Songpan- Ganzi geosynclinal, east of Yangtze platform, intense tectonic activity in the area, forming a good ore-forming geological conditions. And the known polymetallic deposits(spots) focus in Xieluo tectonic rock sheet, Yele tectonic slices and Wajiaoba tectonic slices in, so to choose four key areas were predicted and analyzed. Use remote sensing analysis as a means, in the area of regional geological data, remote sensing data, typical deposit of processing and analysis, combined with previous modern metallogenic prediction theory, the realization of comprehensive prospecting for ore model construction, division of metallogenic.The main work of this thesis is as follows:(1) Making use of the Landsat 8 data to establishing the interpretation of line structure signs and carry out the regional remote sensing geological interpretation and information extraction. Based on the existing interpretation information are quantitative analysis, to study the direction of linear structure and the spatial distribution of Line loop structure.(2) Through principal component analysis method to obtain the region hydroxyl and iron staining abnormal information, the surface temperature inversion method to obtain surface temperature anomaly information. Based on the GIS software platform to obtain the abnormal information for statistical analysis, for the follow-up work to provide foundation information.(3) Based on the GIS platform, overlay analysis with regional geological and geochemical anomalies, and the extracted remote sensing anomaly, according to the established comprehensive information prospecting model, according to the metallogenic factors and deposits(points) related to the degree of overlay analysis, it is concluded that the regional metallogenic favorability.Combined with the regional metallogenic favorability and geology, remote sensing, geochemical background, delineation of multiple target areas. In the Ebangou regional metallogenic channel area is controlled by nearly SN, NNE and NNW trending linear structure, the hydroxyl and iron anomaly are guiding the mineralization information for ore formation of Devonian rod group and Sinian Dengying Formation, geochemical anomaly elements are AU, CU, AG; Dashuigou area near SN linear structure to host, as a guide of hydroxyl abnormal mineralization information, ore formation is of Silurian in Tonghua rock group the two and three sections, geochemical anomaly elements are AU, CU, PB; Ganhaizi area near SN and NNE trending linear structure for ore bearing structure. As a guide of abnormal iron stained alteration mineralization information, ore in the Devonian of rod group and pre Devonian, geochemical anomaly elements are AU, AG; Yaozhangou area in the past SN linear structure for ore, iron anomaly as a guide of mineralization alteration information, geochemical anomalies of elements AU, AG, PB. Based on the analysis on the delineation of target for screening and grading, and ultimately to mineral resources in Shimian-Mianning region survey provides some basic data and scientific basis.