Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p41a..08k&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P41A-08
Physics
5420 Impact Phenomena (Includes Cratering), 5440 Magnetic Fields And Magnetism, 5460 Physical Properties Of Materials, 1519 Magnetic Mineralogy And Petrology
Scientific paper
Low-level shock can produce changes in the magnetic expression of minerals while leaving mineral phases intact. When shock occurs in an ambient field magnetic the minerals can acquire remanent magnetization. In the absence of a magnetic field shock results in demagnetization. Magnetization and/or demagnetization by shock is proportional to the magnitude of the coercivity of the magnetic carriers.This causes a distinct shock response of contrasting magnetic minerals. Our experimental setup produced shocks of 1Gpa pressure in a magnetically shielded volume (< 70 nT). Remanence of titanohematite (exsolved with ilmenite lamellae), SD magnetite (dispersed in spinel), MD hematite, MD magnetite decreased to 80%, 32%, 30%, and 15% respectively. Natural remanence left in these minerals was: 505 A/m, 250 A/m, 1,000 A/m, 20 A/m respectively.Directional shock magnetic measurements on pure hematite indicate that demagnetization by shock is slightly more effective in direction parallel to shock propagation.
Kletetschka Gunther
Wasilewski Peter J.
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