2021
DOI: 10.1093/gji/ggab090 View full text |Buy / Rent full text
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Abstract: Summary The timing of inner core nucleation is a hugely significant event in Earth's evolution and has been the subject of intense debate. Some of the most recent theoretical estimates for the age of nucleation fall throughout the Neoproterozoic era; much younger than previously thought. A young inner core requires faster recent core cooling rates and a likely hotter early core; knowledge of its age would be invaluable in understanding Earth's thermal history and total energy budget. Predictions… Show more

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“…It has recently been noted that Slope T values may be dependent on hold duration (Lloyd et al, 2021); this is now further supported in more detail here. To analyse the cause of these latest observations, we subjected three of the specimens from site MD6 to a third TRM, heating to 610°C using a hold duration of 40 min and compared the AF demagnetisation spectra.…”
Section: Double Heating Technique Hold Time Resultssupporting
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“…It has recently been noted that Slope T values may be dependent on hold duration (Lloyd et al, 2021); this is now further supported in more detail here. To analyse the cause of these latest observations, we subjected three of the specimens from site MD6 to a third TRM, heating to 610°C using a hold duration of 40 min and compared the AF demagnetisation spectra.…”
Section: Double Heating Technique Hold Time Resultssupporting
“…The inclusion of LTD treatment is optional with respect to the theory behind the DHT. Recent studies of rocks that were moderately to highly MD (15-28%), obtained very similar palaeointensity estimates from LTD and non-LTD sister specimens (Yamamoto et al, 2007;Lloyd et al, 2021) and other studies successfully use the method without LTD. (Thallner et al, 2021). However, the incorporation of LTD can be important, not only for removing MD-like remanence, but also for the additional information it provides.…”
Section: The Shaw Methodsmentioning
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