XII SSAGI. The aim of the South American Symposium on Isotope Geology (SSAGI) is provide a fertile environment for the discussion of methods and applications of stable and radioactive isotopes in the Earth Sciences, and their development in South America. It encourages scientific interaction in this field at both national and international levels. The official conference languages are English, Spanish and Portuguese.

The first SSAGI was held at Campos de Jordao, Brazil, in June 1997, organized by geoscientists of the Institute of Geosciences of the University of Sao Paulo. Over time this international conference has been held every two years and celebrated in various cities around South America and Mexico: XII SSAGI continues from XI SSAGI held in 2018 in Cochabamba, Bolivia. This will be the second time that Chile has hosted the symposium: III SSAGI was held in Pucón in October 2001, organized by the Servicio Nacional de Geología y Minera with participation of geoscientists from the University of Chile.

Geological Society of Chile. The Geological Society of Chile was founded in 1962. The main purpose of this society is to provide a forum for the discussion and propagation of geological knowledge in the country, free from the institutional influence of university departments, institutes, centers and companies where this science is practiced. The mission of the Geological Society is to support the development of geology in Chile in all its aspects, and to communicate the results of this science to the rest of the community. It must focus on promoting and carrying out actions for the benefit of Chilean society and the country.

Greetings. It gives a great pleasure to us to welcome geoscientists of diverse and fascinating areas of Earth sciences who will participate in XII SSAGI. The symposium aims to exchange knowledge of advances in the application of isotope geochemistry and geochronology to basic and applied research. This XII SSAGI series of international conferences has provided many opportunities to foster and promote continuous international collaboration and keep the Earth science community up-to-date on Isotope Geology research. We look forward to seeing you at XII SSAGI to be held in the coastal city of Viña del Mar, Chile. The Organizing Committee.