3d Gravity Inversion For Mineral Exploration Over Southern Green-stone-belts Of Ethiopia

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Mainly this study aimed to investigate subsurface geology of the southern green stonernmineralization zone for evaluation of gravity inversion is how effectively detecting high-densityrnmineralization. Throughout the project, three main tasks have done: the first task was carryingrnout necessary correction for observed gravity data. Under this stage three main outputs werernobtained: Bouguer gravity anomaly, regional Bouguer anomaly and residual Bouguer anomaly.rnThe target information is represented by residual anomaly therefore it is became the final data forrninversion process. The second task was minimizing Tikhonov’s cost function and carrying outrninversion with the help of a conjugate gradient algorithm after formulated sensitivity matrix. Therninterpretation process was the last step of the work. The results obtained from the inversionrnprocess are demonstrated in two forms: the first one was a horizontal slice that illustrated therntrend of mineralization in a horizontal plane and the second was density contrast model in arnvertical plane that illustrated at four different lines of cross-section. In the horizontal densityrncontrast model, the pixels value of high-density contrast under mineralization zone revealedrn76.8% of pixels made a good agreement with the mineralization history of the target region. Inrnaddition, 90.3% of high-density contrast agreed with the location of metallic minerals in thernregion. In contrast, very low-density contrast in the region scored 3.77%. Therefore the invertedrndensity contrast model well demonstrated the signature of mineralization in the target region.rnThe vertical slice of the density contrast model indicated the depth condition of the highrnanomalous density region. Thus cross-section profile 1 up to 4 maximum depth and percentagernof high density contrast above 600m depth are 1309.464m, 1089.866m, 847.72m, 661.0338mrnand 81.5%, 72%, 86.3%, 99.1% respectively. The vertical patterns of high-density contrast arerncorrelated with the information obtained from a borehole at the mineralization zone. From suchrnresults and validation, I concluded: gravity anomaly inversion is a good tool to detect thernposition, depth extent, and the trend of the significant anomalous region.

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3d Gravity Inversion For Mineral Exploration Over Southern Green-stone-belts Of Ethiopia

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