147sm dating website
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The constraints from this and previous research predict great potential for using Lu-Hf garnet chronology to accurately date petrological processes at extreme temperatures.These were analysed by 40Ar-39Ar, 87Rb-87Sr and 147Sm-143Nd geochronology to explore the thermal and tectonic histories of central Australian basins.The combined age data provide evidence for three major periods of fault reactivation throughout the Phanerozoic.Garnet and zircon dates are typically dissimilar, even when REE signatures could suggest garnet-zircon equilibrium.This shows that zircon (re-)crystallization is largely fluid-driven and involves localized, rather than rock-wide REE equilibrium.To test this concept, we performed grain-size controlled Lu-Hf chronology to (Cr-)pyrope from asthenosphere-derived mantle fragments exposed in Western Norway.
Previous garnet chronology using the Nd system yielded Mesoproterozoic and Silurian ages, representing cooling in the mantle and entrainment in the Caledonian Orogen, respectively.
Lord Kelvin and Clarence King calculated the length of time required for the Earth to cool from a white-hot liquid state; they eventually settled on 24 million years.
James Joly calculated that the Earth’s age was 89 million years on the basis of the time required for salt to accumulate in the oceans.
The data do not reflect artificial skewing and dispersion as proposed for the Lu-Hf system by numerical models.
The data instead highlight the control of Lu/Sm zoning and differential daughter-isotope loss on garnet chronometers.
They observed that every rock formation, no matter how ancient, appeared to be formed from still older rocks.