15745

14059

كارشناسي ارشد

اكتشاف

اصفهان : دانشگاه صنعتي اصفهان

1399

ده، 217ص. : مصور، جدول، نمودار

حسن طباطبايي

محمد رضا ايران نژادي

احمدرضا مختاري، سعيد پورمنافي

1399/06/17

كتابنامه

معدن

مهندسي معدن

1399/06/24

2631823

AbstractThe granitoid massifs of Kashan 1 100000 sheet and related skarns are located in the magmatic plutonic belt of Orumieh Dokhtar and between the zones of Sanandaj Sirjan and Central Iran These intrusive masses with granodiorite tonalite composition penetrated the Middle Mycenaeanperiod from northwest of Kashan to the south of Ghahroud village in a series of shales andJurassic sandstones limestone and Cretaceous and Eocene marls They caused Adjacentmetamorphism to the surrounding rocks and the formated skarns marble quartzite and hornfels Kashan region located in the northeast of Isfahan is a suitable area for exploration of metalminerals Important criteria of iron skarn ore mining can be seen in this area The most importantof these criteria are the presence of thermal metamorphic due to plutonic infiltration masses andstructural complications such as lineation and faults In this research ASTER and SENTINEL 2A satellite data have been used to highlight the alterations in the field samples Initially theASTER image resolution was increased to 10 meter by SENTINEL 2A images by variousmethods such as false color composite spectral angle mapper SAM mixture tuned matchedfilter MTMF and Linear spectral unmixing LSU alterations of index minerals have beenhighlighted The results of satellite image processing were controlled using spectroscopic andfield studies According to the results of remote sensing MTMF method as a sub pixel methodhas the highest degree of adaptation compared to SAM and LSU methods and has identifiedalterations more accurately Also increasing the resolution of ASTER images by SENTINEL 2Ahas improved the performance of the methods used In order to determine the mineralogicalcharacteristics of field samples thin and polished sections were prepared Also the spectralcharacteristics of the samples were measured using FieldSpec4 spectrometer and then extractedusing RS3 software In geophysical studies 7 5 km airborne magnetic data were used to identifylarge intrusive masses and their boundaries with iron skarn ore mining units In these studies reduced to pole RTP upward continuation first vertical derivative and analytical signalmethods were used The methods of reduced to pole and the analytical signal had the highestdegree of Conformity with the mineral area and indices In geochemical studies hopeful areaswere determined by studying the true catchment basin area and using factor analysis of normaldata and Geochemical Mineralization Probability Index GMPI Prediction area diagram P A was used to quantitatively evaluate the results of geochemical studies According to theprediction area diagram the combined method of stepwise factor analysis and GMPI improvedthe results compared to conventional factor analysis so that in a smaller area of catchments more areas of skarn iron were identified Structural features were also developed by geologicalmap Finally various information layers including metamorphism maps geological maps faultsand geochemical and geophysical anomalies maps in ArcMap10 5 software using fuzzyAnalytical Hierarchy method to prepare iron skarn mineral potential maps were integrated Thefuzzy analytic hierarchical method while significantly reducing the exploration area identifiedsix of the seven area of skarn iron In order to reduce the uncertainty of the fuzzy analyticHierarchy method a sensitivity analysis was performed The results of sensitivity analysisshowed that by changing the scores of criteria and options the prioritization of layers was not thesame but the first priority of each criterion did not change Keywords Kashan 1 100000 sheet Iron skarn True catchment sample basin Geochemicalmineralization prospectivity index Reduced to pole ASTER Fuzzy analytical hierarchy Sensitivity analysis

حسن طباطبايي

محمد رضا ايران نژادي

احمدرضا مختاري، سعيد پورمنافي