Coccoid-like microstructures in a 3.0 Ga chert from western Australia

Ueno, Y. and Isozaki, Y. and McNamara, K. J. (2006) Coccoid-like microstructures in a 3.0 Ga chert from western Australia. International Geology Review, 48 (1). pp. 78-88. ISSN 938-2839 (electronic) 0020-6814 (paper) DOI 10.2747/0020-6814.48.1.78

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Abstract

Organic-walled spheroidal microstructures were discovered in a 3.0 Ga chert of the Cleaverville Formation, Western Australia. The spheroids are composed of solitary or paired cell-like units enclosed by an outer envelope, which are apparently similar to cyanobacterial microfossils. However, some of the spheroidal structures appear to be related to the arrangement of the surrounding minerals, and some to overprint diagenetic fabrics. Despite several cell-like characteristics, such as organic composition, paired nature, and multi-layered envelopes, at least some spheroids were formed during diagenesis, and thus are of diagenetic origin rather than being fossilized cells. It has been generally difficult to distinguish Archean microfossils from abiotic carbonaceous structures, however, and such microscopic observations could demonstrate the abiotic origin of some superficially fossil-like structures produced during diagenesis.

Item Type: Article
Uncontrolled Keywords: NIL AREP 2006 P
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
Journal or Publication Title: International Geology Review
Volume: 48
Page Range: pp. 78-88
Identification Number: 10.2747/0020-6814.48.1.78
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:04
Last Modified: 23 Jul 2013 10:08
URI: http://eprints.esc.cam.ac.uk/id/eprint/762

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