South African geologists are part of the international team that has successfully dated the catastrophic eruption of Mount Vesuvius, which obliterated the Roman city of Pompeii in 79 CE. The team has employed an innovative modification of a popular mineral dating technique, argon-argon dating, to establish the chronology of this historic event.
The Challenge of Argon-Argon Dating
Argon-argon dating is a well-known technique that geologists use to determine the time frame of geological events such as volcanic eruptions. However, its application to recent occurrences is notoriously complex. This is due to the fact that the method is based on the decay of radioactive isotopes, a process that requires a considerable amount of time to be measurable.
South African geologists, renowned for their vast experience in deciphering the ancient geological history of our planet, have contributed their expertise to overcome this challenge.
How the Eruption was Dated
The international team focused on the eruption-dated rocks from Mount Vesuvius, specifically the minerals that solidified from the molten lava. These minerals contain traces of argon-40, the product of the decay of potassium-40. By measuring the amount of argon-40 present in the minerals and comparing it to the amount of potassium-40, the team was able to estimate the time that has elapsed since the eruption.
Their calculations confirmed that the eruption indeed happened in 79 CE, corroborating historical accounts provided by Pliny the Younger, a Roman author and administrator who documented the event.
A Breakthrough for Geology
This achievement represents a significant breakthrough for the field of geology. It not only validates the argon-argon dating method but also opens up new possibilities for its use in dating more recent geological events. South Africa’s participation in this effort underscores the important role the country plays in the global scientific community, particularly in the field of geology.
South African geologists’ contribution to this international research effort is a testament to the country’s robust scientific capabilities. The knowledge gained from this research will undoubtedly be invaluable in predicting and mitigating the impacts of future volcanic eruptions, both in South Africa and around the world.
The detailed findings of this research have been published on Gizmodo.com. The report highlights not only the successful dating of the Pompeii eruption but also the significant contribution of South African scientists to this groundbreaking study.
Source: Original Article
