Dating lava flows for paleomagnetic

The future duration of this decrease is unpredictable.We try to understand the underlying processes by reconstructing the past field changes. Two categories of data form the important basis for our work: directly observed data and paleomagnetic data obtained in laboratory work.

Knowledge about past geomagnetic field variations and a better understanding of the underlying processes deep inside the Earth are necessary to estimate the future evolution of the geomagnetic field.New K/Ar ages ranging from 50 ka to I Ma have been obtained on andesites using the Cassignol-Gillot technique at the Université Paris Sud - Institut de Physique du Globe de Paris Orsay laboratory.Additional flows (with K/Ar ages obtained using the same dating technique) were also sampled for paleomagnetic investigations.The (very similar) paleomagnetic directions gathered from eight internally consistent sites were compared to reference geomagnetic field directions of the last 5–10 ka.Directions from Cuddia del Gallo agglutinate and Khaggiar flows translate into 5.9- to 6.2-ka ages, whereas the Fastuca pumices yield a slightly older age of 6.2–6.8 ka.More than 200 samples were analyzed using both alternating field AF and thermal stepwise demagnetization techniques.

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