Methodology Study on the Remote Sensing Geological Prospection is Shhanxi Province, China
Bai Xing Feng,Ran Xing Min
Shaanxi Remote Sensing Center
Introduction
In Remote Sensing geological prospection, the advantages of Remote Sensing technology must be made full use, according to the project, roper scales of images must be taken as the basic information and processed with computer and other means. Comprehensive interpretation can be carried out geologically to extract all necessary geological information. The author raised two or methods for the Remote Sensing geological prospection according toe h reality of Shaanxi: a. Prospection with direct marked information; b. Prospecting with indirectly marked information combined with comprehensive analysis. examples are given for these two methods.
Theoretic Bases for Remote Sensing geological prospection
Remote Sensing image are comprehensive miniature of objects and all of the scenes on the ground according to certain scales and also are the reality records of reflecting and radiation spectrum of surface objects on the crust. Various objects on the ground absorb, reflect (inc. disperse), transmit and radiate differently the electro-magnetic waves with different lengths. The differences of the spectrum choicely reflected and radiated by different ground objects (inc. rocks and minerals) form the physical basis for judgment of different objects with Remote Sensing images.
In our work, spectrum analysis was carried out for the different rocks and minerals and the results show that the curves of reflecting spectrums are quite different. These differences forms different tones and colours of different rocks and minerals and the rocks and minerals show different imagery textures. These textures are indicator marks for geointerpretation of Remote Sensing images and the identification of rocks, and are also the theoretical basis for the Remote Sensing prospection.
Methodology of Remote Sensing geological prospection.
Remote Sensing geological prospection is to make use different Method. This method is an effective way for prospection of blind ore bodies or deposits, on the basis of imagery features of Remote Sensing images with data of geology, geophysics and geochemistry, integrating with the comprehensive process and analysis of al the data. necessary statistics should be carried out mark predictions.
- Maximum information extraction and interpretation are carried out from the Remote Sensing images of the working areas, and series interpretation maps must be made for each item.
- Comprehensive analysis are carried out on geology, geophysics and geochemistry integrating with the imagery features.
- Make comparisons of the interpretation results with geological and geophysical and geochemical information, and make statistics study;
- Make multi-data imagery processing on the information of Remote Sensing images, geology., geophysics and geochemistry and make analysis on the results.
- Set-up Remote Sensing image minerogenetic models and circumscribe to predicted areas.
- Carry out spot investigations to make field testifications in the predicted areas.
This method is extensively used in the Remote Sensing geological prospection for blind ores and it has resulted fruitfully in Shaanxi.
Prospecting Example ion This Study
I. Tectonic alteration zones wer176e found out in Shanyang Country when interpretation was carried out on images of Shangzhour region. They were confirmed by the field testification to be 30m in width and 150m long. I these zones, strong silification, carbonation and puritization were seen. Pyrite occurs in block, veilwnt and spot and in zones along the contacted area of carbonation with silicification, pyrite grains are small smaller from South to the North. Analysis results of the samples show that Cu is upto 1000ppm, Pb 100ppm and Au. 0.38g/t.
II. Four anomalies were found in Qinggangping Bayyan areas, and they were confirmed to be quarts veins with gold and lead mineralization in different length and the thickness is 0.5 – 2m Godl is up to 1.72g/t according to the sample analysis.
