Magnetic Transitions Observed in Sulfide Minerals at Elevated Pressures and Their Geophysical Significance

Science  26 Jan 1973:
Vol. 179, Issue 4071, pp. 375-377
DOI: 10.1126/science.179.4071.375


The magnetic behavior of iron in chalcopyrite (CuFeS2) and pyrrhotite (Fe7S8) in the pressure range from 1 atmosphere to 20 kilobars has been studied by Mössbauer spectroscopy. Both chalcopyrite and pyrrhotite exhibit transitions from magnetically ordered to disordered states over the range from 5 to 16 kilobars. Both transitions, particularly the loss of ferrimagnetism in pyrrhotite, have geophysical consequences.