Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.t22a..03r&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #T22A-03
Other
8120 Dynamics Of Lithosphere And Mantle: General, 8125 Evolution Of The Earth, 1517 Magnetic Anomaly Modeling, 1533 Remagnetization, 1545 Spatial Variations (All Harmonics And Anomalies)
Scientific paper
The large meteorite impact origin proposed for the Bangui satellite altitude magnetic anomaly (Girdler, R.W., Taylor, P.T., Frawley, J.J., 1992, A possible impact origin for the Bangui magnetic anomaly (Central Africa), Tectonophysics, 212, 45-58) is further investigated in this paper using the Euler and the analytic signal methods implemented in spherical coordinates. A comparison of our results of these methods on model studies and Magsat and CHAMP magnetic anomaly data favors a circular disk-like geometry for the source of the magnetic anomaly. This model was originally proposed by Girdler et al. Our results and other data such as the topographic double-ring, negative Bouguer-gravity anomaly and the presence of carbonados in the region collectively suggest that this model likely explains the origin of one of the Earths largest magnetic anomalies. This anomaly initally led scientists to realize that lithospheric magnetic fields could be observed by satellites. Two ways of producing a large circular-shaped anomaly could be either by remagnetization during impact or cracking the lithosphere with the subsequent large-scale thermal remanent magnetization of the resulting regional magmatism produced by decompression melting. There are many scientific and societal implications of such large meteorite impacts, and if such impact sites could be detected from space using future lower altitude magnetic field data, we will be able to study better the effects of large meteoritic impacts on the evolution of our planet.
Frawley James J.
Ravat Dhananjay
Taylor Patrick T.
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