Magnetic anomalies, layered intrusions and Mars

S. A. McEnroe*, J. R. Skilbrei, P. Robinson, F. Heidelbach, F. Langenhorst, L. L. Brown

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article numberL19601
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Volume31
Issue number19
DOIs
Publication statusPublished - 16 Oct 2004
Externally publishedYes

Keywords

  • 1517 Geomagnetism and Paleomagnetism: Magnetic anomaly modeling
  • 1519 Geomagnetism and Paleomagnetism: Magnetic mineralogy and petrology
  • 3902 Mineral Physics: Creep and deformation
  • 6225 Planetology: Solar System Objects: Mars

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    McEnroe, S. A., Skilbrei, J. R., Robinson, P., Heidelbach, F., Langenhorst, F., & Brown, L. L. (2004). Magnetic anomalies, layered intrusions and Mars. Geophysical Research Letters, 31(19), 1-4. [L19601]. https://doi.org/10.1029/2004GL020640