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    Quantitative interpretation of airborne gravity gradiometry data for mineral exploration

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    Author
    Martinez, Cericia D.
    Advisor
    Li, Yaoguo
    Date issued
    2015
    Keywords
    processing
    potential-fields
    mineral exploration
    interpretation
    gravity gradiometry
    3D inversion
    Airborne gravimetry
    Gravity -- Measurement
    Inversion (Geophysics)
    Prospecting -- Geophysical methods
    Data processing
    
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    URI
    https://hdl.handle.net/11124/17110
    Abstract
    In the past two decades, commercialization of previously classified instrumentation has provided the ability to rapidly collect quality gravity gradient measurements for resource exploration. In the near future, next-generation instrumentation are expected to further advance acquisition of higher-quality data not subject to pre-processing regulations. Conversely, the ability to process and interpret gravity gradiometry data has not kept pace with innovations occurring in data acquisition systems. The purpose of the research presented in this thesis is to contribute to the understanding, development, and application of processing and interpretation techniques available for airborne gravity gradiometry in resource exploration. In particular, this research focuses on the utility of 3D inversion of gravity gradiometry for interpretation purposes. Towards this goal, I investigate the requisite components for an integrated interpretation workflow. In addition to practical 3D inversions, components of the workflow include estimation of density for terrain correction, processing of multi-component data using equivalent source for denoising, quantification of noise level, and component conversion. The objective is to produce high quality density distributions for subsequent geological interpretation. I then investigate the use of the inverted density model in orebody imaging, lithology differentiation, and resource evaluation. The systematic and sequential approach highlighted in the thesis addresses some of the challenges facing the use of gravity gradiometry as an exploration tool, while elucidating a procedure for incorporating gravity gradient interpretations into the lifecycle of not only resource exploration, but also resource modeling.
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