MuItispectraI remote sensing interpretation of granite-type rare earth metaIs information in DaxinganIing area:#br# casestudy with AIiura area in Keyouzhongqi, Inner MongoIia#br#
ZHANGJiawang1 , WANGJianguo1 , ZHANGGuo1iang2 , TAOJingmei3 , TANGSiqi1 , ZHAOWutao1
1.CollegeofEarth Sciences, ]ilin University, Changchun 130061, China;
2.]ilin KeyLaboratoryofSatelliteRemoteSensing Application Technology, Changguang SatelliteTechnologyCO., LTD, Changchun 130000, China;
3.GeologicalMuseum, ]ilin University, Changchun 130026, China
In order to improve the prospecting potentia1 of a1ka1inegranite-typerareearth meta1sin Daxingan- 1ingarea, theref1ection spectrumcurveofa1ka1inegranite-typeminera1ized rocksin A1iuraareaofInnerMongo1ia ismeasured byauthors.Thespectra1responsecharacteristicsofLandsat-8 OLI, ASTERand Ji1in -1 sate11iteremote sensing image sareused toana1yzetheband characteristics.Band ratioand compositeprincipa1componentana1ysis areused in eremotesensinggeo1ogica1interpretation method ofminera1ization anoma1yinformation sothatthe spectra1characteristicsand research methodsofa1ka1inegranite-typerareearth e1ementsminera1ization information aresummarized.Theresu1tsshowthattheabsorption characteristicsofminera1ized rocksat1.01 µm， 2.34 µm
and theref1ection peak at2.26 µm in thestudyareahaveobvious1yspectra1characteristics， which aredifferent fromtheconventiona1granitesand respond toband19 ofJi1in -1 spectra1star， band7 and band8 ofASTER， respec- tive1y.Theminera1ization anoma1yinformation hasgood effectbyusingASTERand Ji1in -1 spectra1star， especia1- 1y， Ji1in -1 spectra1starinterpretation accuracyishigher.In termsofresearch methods， theinformation extracted bycompositeprincipa1componentana1ysisismoreconcentrated and moreaccuratethan thatbyband ratiomethod.