Dating of Pleistocene uranyl phosphates in the supergene alteration zone of Late Variscan granites by Laser-Ablation-Inductive-Coupled-Plasma Mass Spectrometry with a review of U minerals of geochronological relevance to Quaternary geology

作者：Dill Harald G^*; Gerdes Axel; Weber Berthold

来源：Chemie der Erde, 2011, 71(2): 201-206.

DOI：10.1016/j.chemer.2010.09.001

• Laser-Ablation-Inductive-Coupled-Plasma
• Mass Spectrometry
• Pleistocene
• Metatorbernite-bassetite
• Weathering pits
• Granite

Laser-Ablation-Inductive-Coupled-Plasma Mass Spectrometry (LA-ICP-MS) has proved to be a reliable tool to date metatorbernite-bassetite solid solution series in Pleistocene weathering pits developing on the surface of Late Variscan granites. The maximum age of weathering in these granites in NW Spain is 1.61 +/- 0.01 Ma. The likelihood to find uranyl phosphates or silicates amenable to LA-ICP-MS dating increases with increasing silica content in the magmatic bedrocks (granites) and with decreasing grade during regional metamorphism (low-grade-stage/greenschist metamorphics) of the parent material. Uranyl vanadates may be used for geochronological studies during the Quaternary as well but they are confined to arid morphoclimatic zones.

• 出版日期2011