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TN550 : Comparison and integration of airborne magnetic, resistivity and induced polarization data to recognize subsurface structures in Kalateh Reshm area, Damghan
Thesis > Central Library of Shahrood University > Mining, Petroleum & Geophysics Engineering > MSc > 2015
Authors:
Atefeh Ghandehari Alavijeh [Author], Ali Reza Arab-Amiri[Supervisor], Abolghasem Kamkar Rouhani[Supervisor], M. R. Akhavan Aghdam [Advisor], Alireza Ameri [Advisor]
Abstarct: If the results of airborne geophysical data accompany ground geophysical methods such as resistivity and induced polarization methods, they can be used for determination and geometric interpretation of mextallic and non-mextallic conducting or polarizable bodies. In fact, the validation of airborne geophysical results is often made by ground geophysical findings. In our country, airborne geophysical data do not have much application for subsurface exploration. However, anomaly areas can be determined by modeling and interpretation of these airborne geophysical data, and also, subsurface structures can be recognized in semi-detailed exploration phase by mapping several ground survey lines. Considering 1:100000 geological map of Kalateh Reshm area in Semnan Province and the existence of mineral indices such as copper, lead, zinc and gold, the interpretation of airborne magnetic data plays an important role in recognizing mineral limits and geological situation of the area as the most important information from the area is the geological map of the area. Due to high speed and low cost of airborne geophysical extensive surveys, we can take a big step in recognizing important subsurface mineral deposits if maximum information is obtained from the surveys. After preliminary studies and preparation of magnetic and electrical conductivity maps from airborne geophysical data using the Oasis montaj of Geosoft Company in Kalateh Reshm area, two anomalous zones of arc shape were obtained. To recognize the possible subsurface anomalies in these two zones, ground geophysical surveys using resistivity and induced polarization methods were carried out, and as a result, geometric dimensions of anomalies, particularly their depth variations and quality in terms of their mextallic sulfides were investigated. Acquisition of resistivity and chargeability data was made along four ground geophysical survey lines for subsurface detailed exploration in the area. The acquired data were modelled using RES2DINV and ZondRes2d, and the obtained modeling cross sections were interpreted using geological information and the results of airborne geophysical surveys. Finally, two zones having high chargeability were proposed for exploration drilling.
Keywords:
#Airborne magnetic surveys #Induced polarization #Electrical resistivity #Dipole-dipole array #ZondRes2d software #Porphyry copper Keeping place: Central Library of Shahrood University
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