MagNetZ With Janine Arujo do Carmo (2022/04/06) - Paleomagnetic record of speleothems from N-Africa
Channel: MagNetZ
Date: 2022-04-06

Paleomagnetic record of speleothems from North Africa

The video is also available for download at: https://earthref.org/ERDA/2523/
and can be referenced with the doi: 10.7288/V4/ERDA/2523

Title: Paleomagnetic record of speleothems from North Africa
Author: Janine Arujo do Carmo from the Universidade de São Paulo, Brasil

Fast changes in the direction and intensity of the geomagnetic field have been reported for the past millennia, including the Levantine Iron age anomaly, which corresponds to extremely high geomagnetic field intensities recorded in eastern Europe and the Middle-East. In our group, we have investigated these rapid changes in the geomagnetic field using speleothems. Despite their low magnetic intensity, they can be used to successfully obtain information about the paleomagnetic field. Speleothems have some important advantages when compared to other “traditional” archives in paleomagnetism. They acquire their natural remanence almost instantaneously, are unaffected by post-depositional effects and can be dated with high accuracy. Here I will present a 6,000 yrs speleothem full-vector record for two stalagmites from Wintimdouine cave in Morocco. These speleothems overlap in age the Levantine anomaly. Our results are compared to available data for marine sediments, volcanic rocks and archeological material and to the most recent geomagnetic models for the region and the implications for the nature and extent of the Levantine anomaly are discussed.

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00:00 - Intro
00:23 - Presentation
27:29 - Questions
36:44 - Announcements