Abstract
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.
Highlights
Hasui et al, 1975)
1 The Colônia site In September 2014, an International Continental Scientific Drilling Program (ICDP) sponsored workshop was organized in São Paulo (Brazil), gathering a large group of scientists involved in the study of various aspects of the Colônia structure
No datable material related to basin formation has been found at Colônia so far
Summary
In September 2014, an International Continental Scientific Drilling Program (ICDP) sponsored workshop was organized in São Paulo (Brazil), gathering a large group of scientists involved in the study of various aspects of the Colônia structure. Riccomini et al (2011) noted that the current depth-to-diameter ratio is different from sized and comparatively deeper known impact structures (e.g., Brent Crater, Ontario, attains a depth in the inner part of the basin of 1000 m). This was interpreted as indicating that the crater could have been substantially eroded since its formation. In 2009, Ledru et al estimated that the complete depositional record could span at least 1.5 to 2.5 Ma
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