Magnetic anomalies, layered intrusions and Mars

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

doi:10.1029/2004GL020640

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 journal › Article › peer-review

39 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 language	English
Article number	L19601
Pages (from-to)	1-4
Number of pages	4
Journal	Geophysical Research Letters
Volume	31
Issue number	19
DOIs	https://doi.org/10.1029/2004GL020640
Publication status	Published - 16 Oct 2004
Externally published	Yes

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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10.1029/2004GL020640

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title = "Magnetic anomalies, layered intrusions and Mars",

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.",

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AU - McEnroe, S. A.

AU - Skilbrei, J. R.

AU - Robinson, P.

AU - Heidelbach, F.

AU - Langenhorst, F.

AU - Brown, L. L.

PY - 2004/10/16

Y1 - 2004/10/16

N2 - 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.

AB - 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.

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KW - 3902 Mineral Physics: Creep and deformation

KW - 6225 Planetology: Solar System Objects: Mars

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Magnetic anomalies, layered intrusions and Mars

Abstract

Keywords

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