Physics
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pepi..160..169k&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 160, Issue 2, p. 169-179.
Physics
8
Scientific paper
We studied the change of magnetic behaviour upon laboratory heating of altered mid-ocean ridge basalt (MORB) samples in the age range of 16 35 Ma to determine the influence of titanomaghemite inversion on the thermal demagnetisation of natural remanent magnetisation (NRM) of these basalts. MORB samples were heated to successively higher temperatures and at the same time the temperature dependence of either saturation magnetisation or NRM was monitored continuously. After each heating step, hysteresis loops and remanent magnetisation curves between 10 K and room temperature were measured. With this procedure, it is shown that the dominant magnetic remanence carrier in our MORB samples is cation deficient titanomaghemite. Moreover, it is demonstrated that the titanomaghemite is gradually changing to a Ti-poor titanomagnetite as the final inversion product. During inversion, both the Curie temperature as well as the maximum unblocking temperature of the NRM are gradually increasing. We show that the paradox of unblocking temperatures above the Curie temperatures often observed for altered MORBs is an artefact of this gradual, heating induced inversion process.
Krása David
Matzka Jürgen
No associations
LandOfFree
Inversion of titanomaghemite in oceanic basalt during heating 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 Inversion of titanomaghemite in oceanic basalt during heating, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inversion of titanomaghemite in oceanic basalt during heating will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1156433