Blake excursion at Vulcano (Aeolian Islands, Italy): Revised K-Ar and Ar-40/Ar-39 ages

作者：Guillou Herve^*; Scao Vincent; Nomade Sebastien

来源：Quaternary Geochronology, 2016, 35: 77-87.

DOI：10.1016/j.quageo.2016.06.002

• Geochronology
• Excursion
• Ar-40/Ar-39
• Volcanism

In this study, we combine the unspiked K-Ar and the Ar-40/Ar-39 methods to refine the dating of the directional excursion recorded in a lava sequence from Vulcano (Aeolian Islands, Italy) and attributed to the Blake excursion. This approach evidences some errors in the K-Ar dating of the Vulcano sections (erroneous determination of K contents, insufficient gas clean-up). Coupled with the inability of the unspiked method to evidence excess/fractionated Ar-40 and/or xenocrystic contamination, we consider the Ar-40/Ar-39 technique the most appropriate one for calibrating time scales by the K-Ar clock. Our new five ages assess that the directional excursion as recorded in the Vulcano section belongs to the termination of the Blake excursion that we date at 110.7 +/- 1.6 ka. We suggest an age ranging from 106.7 +/- 1.6 to 105.2 +/- 1.4 ka for the beginning of the Post-Blake excursion.

• 出版日期2016-10
• 单位中国地震局