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Magnetic anomalies, layered intrusions and Mars
Geophysical Research Letters (2004)
  • Laurie Brown, University of Massachusetts - Amherst
  • S. A McEnroe
  • J. R Skilbrei
  • P. Robinson
  • F. Heidelbach
  • F. Langenhorst
Studies of remanence-controlled magnetic anomalies on Earth provide possibilities to interpret the nature of crustal rocks that cause the large remanent anomalies on Mars. What types of conditions on Earth can create large remanent magnetic anomalies? Such an anomaly, extending for 20 km centered over a norite layer in the Bjerkreim-Sokndal (BKS) Intrusion, shows a minimum −13000 nT below background in the helicopter survey. Modeling of the anomaly requires a natural remanent magnetization (NRM) value of 24 A/m, similar to values measured in norite samples and to values invoked to explain the anomalies on Mars. Preliminary magnetic assessment considers the roles of hemo-ilmenite, magnetite, and oxide exsolution in clino- and orthopyroxene, and high-temperature ductilely induced lattice-preferred orientation.
Publication Date
Publisher Statement
Doi:10.1029/2004GL020640 An edited version of this paper was published by AGU. Copyright 2004 American Geophysical Union.
Citation Information
Laurie Brown, S. A McEnroe, J. R Skilbrei, P. Robinson, et al.. "Magnetic anomalies, layered intrusions and Mars" Geophysical Research Letters Vol. 31 (2004)
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