Mathematics – Logic
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmgp42a..13k&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #GP42A-13
Mathematics
Logic
5440 Magnetic Fields And Magnetism, 1517 Magnetic Anomaly Modeling, 1519 Magnetic Mineralogy And Petrology
Scientific paper
Intrusion of the Liberty Hill granite (South Carolina) into the surrounding shale causes a distinct aureole along the metamorphic contact. The aureole is divided by five isograds, which are the result of a sequence of continuous reactions. One consequence of the continuous reactions is production of contrasting proportion of magnetite and exsolved titanohematite. The continuous change in the relative amounts of these two minerals, controls the magnetic properties of the hornfelses. This causes magnetic anomaly changes associated with the aureole with inflexions occurring at the isograds. The maximum intensity of the magnetic anomaly coincides with the maximum abundance of titanohematite. The anomaly sharply drops when stable remanence of titanohematite is replaced by unstable remanence of magnetite. Magnetic properties of the aureole, which is the contact between igneous and sedimentary rocks, demonstrate an example of magnetic remanence acquisition in petrological environment that is likely to occur on planet Mars.
Kletetschka Gunther
Speer Alexander J.
Wasilewski Peter J.
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