Abstract

GOGORZA, C.S.G. et al. Application of the pseudo-Thellier technique to a paleomagnetic record from lake El Trébol (Patagonia, Argentina). Geofís. Intl [online]. 2008, vol.47, n.4, pp.319-327. ISSN 2954-436X.

The pseudo-Thellier technique was applied to obtain relative paleointensity determinations using a sediment core from Lake El Trébol (Patagonia, Argentina). Measurements of intensity of natural remanent magnetization left (NRM_left) after AF demagnetization versus intensity of anhysteric remanent magnetization gained (ARM _gained) at the same peak were carried out on a set of samples. Two versions of a jackknife resampling scheme were used to get error estimates on the paleointensity. The pseudo-Thellier paleointensity records were compared with the authors previous results where the remanent magnetization at 20mT (NRM_20mT) has been normalized using the anhysteric remanent magnetization at 20mT (ARM_20mT), the saturation of the isothermal remanent magnetization at 20mT (SIRM_20mT) and the low field magnetic susceptibility (k) (Gogorza et al., 2006). The pseudo-Thellier record shows a reasonable agreement with the standard method of normalization (NRM_20mT/ ARM_20mT).

Keywords : Pseudo-Thellier; relative paleointensity; lake El Trébol; jackknife resampling; robust-resistant slope estimation.

        · abstract in Spanish     · text in English     · English ( pdf )