16 Jun '11, 9am

Dating an Ancient Global Warming: “Determining exactly what triggered the PETM requires very accurate dating of

Dating an Ancient Global Warming: “Determining exactly what triggered the PETM requires very accurate dating of

Spitsbergen Island, where the sediment core was extracted New research into the Paleocene-Eocene thermal maximum, PETM, by scientists based at the National Oceanography Centre in Southampton, have made what they believe to be the most accurate estimation of its time-frame yet, which has allowed them to narrow down its cause. Measuring radio-isotopes of uranium and lead in the mineral zircon found in two historic volcanic ash deposits collected from two locations on the island of Spitsbergen, in the Svalbard Archipelago in the Arctic, allowed the scientists to rule out the possibility that the PETM was caused by eccentricity in the Earth’s orbit. Orbital eccentricity – the amount an orbital body deviates from a perfect circle – was believed to be a possible explanation for the PETM, one of several hyperthermals which took place during the Cenozoic era which started about 65...

Full article: http://planetsave.com/2011/06/16/dating-an-ancient-global...

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grist.org 24 Jun '11, 7pm

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