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Abstract Lake sediment archives covering several glacial cycles are scarce in the Southern Hemisphere and they are challenging to date. Here we present the chronostratigraphy of the oldest continuous lake sediment archive in Tasmania, Australia; a 5.5 m and 270 ka (Marine Isotope Stage 8) sediment core from Lake Selina. We employ radiometric dating (radiocarbon and optically stimulated luminescence) and relative dating (geomagnetic and climate comparisons). Bayesian modeling of the radiometric ages reaches back to 80 ka (1.7 m) and relative dating using a dynamic programing algorithm allows dating of the full sequence. Elemental data, magnetic properties and beryllium isotopes from Lake Selina reveal a close fit to Antarctic ice core climate proxies. Weaker correlation during the Last Glacial Period (MIS 2–4) is attributed to additional local factors impacting Lake Selina proxies at a time of climate changes and human arrival into Tasmania. Over that period, full vector pale ....
| UPDATED: 15:11, Tue, Feb 16, 2021 Link copied Sign up for FREE for the biggest new releases, reviews and tech hacks SUBSCRIBE Invalid email When you subscribe we will use the information you provide to send you these newsletters. Sometimes they ll include recommendations for other related newsletters or services we offer. Our Privacy Notice explains more about how we use your data, and your rights. You can unsubscribe at any time. Earth s magnetic field not only protects our planet and its life from deadly solar radiation, but it keeps north at the top and south at the bottom of the planet s poles. The shield is created by the liquid iron outer core of our planet spinning around the solid inner core. The dynamic action creates an invisible field which goes through the north and south of the planet and encircling it, which leads to the Earth’s North and South Poles. ....
First humans in Tasmania must have seen spectacular auroras Laschamp excursion occurred in Australia and seen by first humans Study shows Tasmanian Aboriginals would ve seen Laschamp geomagnetic excursion. Newswise Drilling a 270,000-year old core from a Tasmanian lake has provided the first Australian record of a major global event where the Earth s magnetic field switched - and the opportunity to establish a precedent for developing new paleomagnetic dating tools for Australian archaeology and paleosciences. This is the first study of this kind in Australia since pioneering studies in the 1980s, said author Dr Agathe Lisé-Provonost, a McKenzie Fellow from the School of Earth Sciences at the University of Melbourne. ....
About 41,000 years ago, something remarkable happened: Earth’s magnetic field flipped and, for a temporary period, magnetic north was south and magnetic south was north. Palaeomagnetists refer to this as a geomagnetic excursion. This event, which is different to a complete magnetic pole reversal, occurs irregularly through time and reflects the dynamics of Earth’s molten outer core. The strength of Earth’s magnetic field would have almost vanished during the event, called the Laschamp excursion, which lasted a few thousand years. Earth’s magnetic field acts as a shield against high-energy particles from the Sun and outside the solar system. Without it the planet would be bombarded by these charged particles. ....