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A Buried Gold Deposit Located in Aohanqi of Inner Mongolia Integrated Geophysical Orientation Location Prediction

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Tutor: YangLiQiang
School: Chinese Geology University (Beijing)
Course: Mineral prospecting and exploration
Keywords: High-precision magnetic survey,Controlled Source Audio-frequency Magnetotelluric
CLC: P618.51
Type: Master's thesis
Year:  2012
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A buried gold deposit area in Aohanqi occurs near the exocontact of North-Chinapaleoland and Variscan orogenic belt, in which more than30gold deposits(occurrences) have been proven; furthermore, it has been found when searching forthe known gold ore bodies these years. Based on the mineralization environment anddeposit feature of the studied area, the paper was formed according to thehigh-precision magnetic survey and Controlled Source Audio-frequencyMagnetotelluric investigation and comparison with the typical deposit. It positionsdelineation of ore-controlling fault structure, and presents the structural informationfor forecasting the buried Metallogenic.1The Archean metamorphic rocks¡ª¡ªThe member of the Xiaotazigou anddayingzi complement of Jianping Group¡ª¡ªdirectly host the wallrock of this golddeposit. A series of active deep faults in this area and its periphery, where there iscomplex geological structure, frequent activity of magmatic and obviousMetamorphic, form extensive granite rock mass which providing the thermal dynamicsource for the formation of gold deposit and enrichment.2The growth of fault structures is the premise and necessary conditions of themetallogenesis. The criss-cross structural system forming by intensively movement oftectonic provides a favorable space for the occurrence of ore body. Fault structuresdirectly decide the output of the belt, deposit and ore body, therefore, the metallogenicprediction, in one sense, is the forecast of fault structure and its favored site.3Comprehensive the geophysical studies have demonstrated that the NE andNW of the buried gold district develops to steep faults structure which closely relatedto the SN-NNE area to fracture structure, which can be predicted as the derivedsecondary structure of the group fault zone. There are obvious swelling characteristicsat the intersection of the two fault belts which is favorable space of mineralization.The geological structural of the North-Central area of the studied area is complex, inwhich the low resistivity can be extended up to the800m below-surface, especiallythe abnormal features are most significant occur around650m below-surface, which isthe best area to look for the deep mineral source of ore layer. Accordingly, the deepmineralization in studying area enjoys great potentials, and more efforts should be putdeep in the650m below-surface on North-Central.
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