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27-Jul-2016 21:44

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Finally, the sample container is wrapped in Cd foil and irradiated.Following irradiation, samples are left to cool down at Ge NF.The quantity of potassium in a rock or mineral is variable proportional to the amount of silica present.Therefore, mafic rocks and minerals often contain less potassium than an equal amount of silicic rock or mineral.Distribution of the volcanics, revealed by high-resolution seismic reflections, is neither restricted within nor in agreement with the framework of the overlying sedimentary sequence striking NNE.This new evidence fits the overlap model, proposed in the present paper, that formation of the volcanic successions in the SB is related to the subduction of the Mongolia–Okhotsk plate under the Mongolia–North China block during the Jurassic and early Cretaceous, whereas the overlying sedimentary sequence unconformably on the volcanics is tectonically controlled by the oblique subduction of the Pacific plate under the Eurasian plate since late Aptian.

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In broader terms, the results mandate a re-evaluation of the astronomically calibrated ages for these and other sanidine samples, while the new generation of multi-collector mass spectrometers provides the means to further evaluate 40Ar/39Ar ages used to define new decay constants and standard ages.

Significantly, 40Ar/39Ar step-heating analyses resolve distinct age gradients for both FCT and ACR sanidine.



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