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These interactions may control reversal frequency and shape the weak magnetic fields that arise during successive dynamo instabilities.Moreover, weakening of the axial dipole during reversals and excursions enhances the production of cosmogenic isotopes that are used in sediment and ice core stratigraphy and surface exposure dating.

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The VGPs produced during these excursions are found to be dispersed longitudinally across Eurasia and are remarkably similar to those associated with the calculated VGPs at West Eifel for the non-axial dipole (NAD) field during the 20th century.

A simple model in which the axial dipole repeatedly collapses leaving behind a residual NAD field that is largely held by stationary sources, probably in the lowermost mantle, provides an explanation for the recurrent excursional behavior during this ∼200 kyr period.

Around 35 people from various research institutions, service providers and the mining industry attended the workshop from across Australia.

The day started with a tour of the John de Laeter Centre (Jd LC) facilities incorporating the Tescan integrated mineral analyser (TIMA; ), which was the key instrument of relevance to the workshop.

DOWNLOAD THE NEWSLETTER Curtin University researchers have for the first time been able to visualise where helium atoms are trapped within individual mineral grains, providing information that can help to determine the geological history of the Earth’s crust and assist in monitoring natural hazards like earthquakes and volcanic eruptions.

November to demonstrate the application and benefits of automated mineralogy to the minerals industry and academic research.

The Geomagnetic Instability Time Scale (GITS) is based on the direct dating of transitional polarity states in lava flows using the Ar method, in parallel with astrochronologic age models of marine sediments in which oxygen isotope and magnetic records have been obtained.

A review of data from Quaternary lava flows and sediments gives rise to a GITS that comprises 10 polarity reversals and 27 excursions that occurred during the past 2.6 million years.

Welcome to the first edition of Wavelength – A quarterly newsletter dedicated to highlighting the latest news and research produced from Curtin’s X-ray characterisation facilities, namely the X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and small angle X-ray scattering (SAXS) facilities.

As a special first edition feature, we have included an entire page that highlights the basic instrument capabilities of each facility.

Reversals and excursions of Earth's geomagnetic field create marker horizons that are readily detected in sedimentary and volcanic rocks worldwide.


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