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    The Lake Bosumtwi meteorite impact structure, Ghana—A magnetic image from a third observational level

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    Author
    Ugalde, H.
    Morris, W. A.
    Clark, C.
    Miles, B.
    Milkereit, B.
    Issue Date
    2007-01-01
    Keywords
    geophysical signature
    Magnetism
    Bosumtwi Ghana impact crater
    
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    Citation
    Ugalde, H., Morris, W. A., Clark, C., Miles, B., & Milkereit, B. (2007). The Lake Bosumtwi meteorite impact structure, Ghana—A magnetic image from a third observational level. Meteoritics & Planetary Science, 42(4‐5), 793-800.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656706
    DOI
    10.1111/j.1945-5100.2007.tb01075.x
    Additional Links
    https://meteoritical.org/
    Abstract
    The Bosumtwi impact structure in Ghana is the youngest and best-preserved medium-sized impact structure on Earth, and because of the vast amount of prior geophysical and geological data gathered in the area, it constitutes a great natural laboratory to try to develop new geophysical interpretation and modeling techniques. During the 2004 International Continental Scientific Drilling Program (ICDP) drilling campaign at Lake Bosumtwi, we made magnetic field observations at 162 stations around the lake. This study differs from all previous magnetic surveys at Bosumtwi, which only measured the scalar portion of the Earth’s magnetic field, in that we measured the full magnetic vector at each station. Acquisition of the full magnetic vector was made possible by innovative use of a borehole deviation probe, which uses a magnetic sensor for absolute orientation reference. Estimates of the magnetic vector orientation and magnitude at each observation station were derived from a series of measurements collected at 50 cm spacing over a depth range of 25 m. In this study, we report a comparison between the scalar total field intensity derived from this new survey approach with the other two previously acquired marine and airborne magnetic data sets. The scalar total magnetic intensity (TMI) computed from the vector data set compares in close agreement with the other two data sets. Some discrepancies between the data sets can be explained by differences in the distances between the sensor and the magnetic sources for the various surveys. The highlight of this study is that we demonstrate that is possible to acquire at least partial vector data with readily available instrumentation.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2007.tb01075.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 42, Number 4-5 (2007)

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