Articles | Volume 20
Sci. Dril., 20, 33–39, 2015
Sci. Dril., 20, 33–39, 2015

Workshop report 17 Dec 2015

Workshop report | 17 Dec 2015

Why deep drilling in the Colônia Basin (Brazil)?

M.-P. Ledru1, W. U. Reimold2, D. Ariztegui3, E. Bard4, A. P. Crósta5, C. Riccomini6, and A. O. Sawakuchi6 M.-P. Ledru et al.
  • 1ISEM, Montpellier University, CNRS, IRD, EPHE, France
  • 2Museum für Naturkunde – Leibniz Institute for Evolution and Biodiversity Science, Unter den Linden 6, 10099 Berlin, and Humboldt Universität zu Berlin, Germany
  • 3Department of Earth Sciences, University of Geneva, Switzerland
  • 4CEREGE Aix-Marseille University, CNRS, IRD, College de France, France
  • 5Institute of Geosciences, University of Campinas, Campinas, SP, Brazil
  • 6Institute of Geosciences, University of São Paulo, São Paulo, SP, Brazil

Abstract. The Colônia Deep Drilling Project held its first International Continental Scientific Drilling Program (ICDP) workshop in September 2014 at the University of São Paulo (Brazil). Twenty-seven experts from six countries discussed the feasibility and the expectations of a deep drilling in the structure of Colônia located at the southwestern margin of the city of São Paulo. After presenting the studies performed at the site during the last decades, participants focused on the objectives, priorities and detailed planning for a full deep-drilling proposal. An excursion to the site and new auger coring showed the importance of the Colônia site for studying the evolution of a tropical rainforest and to evaluate the interplay between the South American summer monsoon, the Intertropical Convergence Zone (ITCZ) and the southern Westerlies belt during the last 5 million years. In addition, deep drilling will eventually solve the still unresolved issue of the origin of the structure of Colônia as a result of meteorite impact or endogenous processes.