A magnetic study of the serpentinization process at Burro Mountain,California |
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| Authors: | Barry R Lienert PJ Wasilewski |
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| Institution: | Geology Department, University of Maryland, College Park, MD 20742 U.S.A.;Astrochemistry Branch — LEP Goddard Space Flight Center, Greenbelt, MD 20771 U.S.A. |
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| Abstract: | A study has been made of the magnetic properties of a suite of continental serpentinites from Burro Mountain, California. The chemistry of this set of samples has been previously studied, enabling the magnetic properties to be compared to the chemical changes which occurred during serpentinization. Two distinct magnetic phases have been recognized. The first is extremely stable but does not appear to contribute significantly to the natural remanent magnetization of the most strongly magnetized samples. The second phase is clearly multi-domained magnetite having a well-defined transition in its coercivity near 120°K. However, this second phase is not apparent in either the least serpentinized or the most serpentinized of the samples studied. The magnetic data argue strongly for the existence of two types of serpentinites; the first is magnetized dominantly by a stable component which we suggest may be Ni3Fe, the second is magnetized Fe3O4 with unstable magnetization. There is no clear connection between the appearance of the stable component and the amount of serpentinization. |
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