Magnetic properties of anorthosites: A forgotten source for planetary magnetic anomalies?

Details Magnetic properties of anorthosites: A forgotten source for planetary magnetic anomalies? Magnetic properties of anorthosites: A forgotten source for planetary magnetic anomalies?

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3502305b&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 2, CiteID L02305

Mathematics

Logic

3

Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Geomagnetism And Paleomagnetism: Magnetic Mineralogy And Petrology, Geomagnetism And Paleomagnetism: Magnetic Anomalies: Modeling And Interpretation

Scientific paper

Anorthosites, igneous rocks very rich in plagioclase, rarely considered to be strongly magnetic, are common on Earth, and the Moon, and inferred to be on other planets. Magnetic properties of anorthosites could be important in investigating associated mineral deposits and in studying magnetic anomalies, especially on Mars. Here we investigate three late Proterozoic anorthosites in Rogaland, Norway, for magnetic and petrographic properties. Two of the anorthosites have large natural remanent magnetization (NRM), with intensities comparable to Tertiary basalts. Susceptibility, NRM and hysteresis properties provide information about the magnetic minerals present and their response to inducing fields. Microscopic observations show ubiquitous hemo-ilmenite in the anorthosites, whereas magnetite is common in the Håland-Helleren, but rare in the Åna-Sira and Egersund-Ogna bodies. This study illustrates that anorthosites can be important sources of magnetic anomalies, and can retain a remanent field over geologic time. It also supports the recently described property of `lamellar magnetization'.

Affiliated with

Also associated with

No associations

Rating

Magnetic properties of anorthosites: A forgotten source for planetary magnetic anomalies? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Magnetic properties of anorthosites: A forgotten source for planetary magnetic anomalies?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic properties of anorthosites: A forgotten source for planetary magnetic anomalies? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-896054