Early traces of life investigations in drilling Archean hydrothermal and sedimentary rocks of the Pilbara Craton, Western Australia and Barberton Greenstone Belt, South Africa | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Early traces of life investigations in drilling Archean hydrothermal and sedimentary rocks of the Pilbara Craton, Western Australia and Barberton Greenstone Belt, South Africa

Publication Type:

Journal Article

Source:

Comptes Rendus Palevol, Volume 8, Issue 7, p.649-663 (2009)

ISBN:

1631-0683

Keywords:

UMR 7154 ; Géobiosphère actuelle et primitive ; Archean; Early life; Diamond drill cores; Pilbara Craton; Barberton Belt; Stable isotopes ; Archéen; Vie primitive; Forages; Craton des Pilbara; Chaîne de roches vertes de Barberton; Isotopes stables

Abstract:

The Pilbara. Craton of Western Australia and the Barberton Greenstone Belt of the Kaapvaal Craton, South Africa, contain some of the oldest and best preserved Archaean rocks and microfossils in the world. Two stratigraphic horizons in the Pilbara Craton were drilled as part of a collaborative effort between France and Australia (the Pilbara Drilling Project) during August 2004, including the 3481 Ma Dresser Formation (Warrawoona Group) and 2724 Ma Tumbiana Formation (Fortescue Group). A new diamond drill hole was cored in August 2008 through part of the similar to 3250 Ma Fig Tree Group in the Barberton Greenstone Belt as part of a joint project between France and South Africa. These pristine diamond drill cores present a unique opportunity to constrain the chemistry of the earliest ocean, the composition of the atmosphere, and the settings and types of microbial ecosystems spanning the Archean Eon. These drill core samples can also provide new clues on the earliest metabolic pathways. To cite this article: P Philippot et al., C R. Palevol 8 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.