Cooling after Double Heating: the Ltd-Thellier Protocol for Paleointensity Determinations

Details Cooling after Double Heating: the Ltd-Thellier Protocol for Paleointensity Determinations Cooling after Double Heating: the Ltd-Thellier Protocol for Paleointensity Determinations

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmgp21b0507c&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #GP21B-0507

Other

1521 Paleointensity, 1540 Rock And Mineral Magnetism, 1594 Instruments And Techniques

Scientific paper

We have combined low-temperature treatment to standard double-heating protocols for paleointensity studies of ancient rocks with significant presence of MD grains. The low-temperature demagnetization, involving at least five liquid nitrogen baths in a zero-field chamber, was used within Thellier double-heating measurements to estimate 1.2 Ga absolute paleointensity on basalts and gabbros from Nova Floresta Formation (Amazon Craton, Brazil), that contain single-domain to multi-domain (pure to nearly pure) magnetite carriers. They present a strong decrease in remanence after low-temperature demagnetization accompanied by an increase in median destructive fields. The incorporation of LTD improved paleointensity estimates and enabled paleofield recovery for otherwise sterile rock samples, giving twenty seven successful determinations for six sites. Site-mean paleofield values are within 4.90 μT and 15.55 μT (mean at 8.37 ± 4.07 μT). These results correspond to a mean VDM of 2.08 ± 0.94 × 1022 Am2, thus increasing the number of low-field determinations that dominate the (still scarce) Precambrian database.

Affiliated with

Also associated with

No associations

Rating

Cooling after Double Heating: the Ltd-Thellier Protocol for Paleointensity Determinations 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 Cooling after Double Heating: the Ltd-Thellier Protocol for Paleointensity Determinations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cooling after Double Heating: the Ltd-Thellier Protocol for Paleointensity Determinations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1409999