Isuasphaera isua (Pflug) revisited

Peter W.U. Appel, Stephen Moorbath, John S. Myers

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14 Citationer (Scopus)

Abstrakt

Spherical objects, identified as microfossils and named Isuasphaera isua (Pflug), were reported in 1978 from a chert in the 3.7-3.8 Ga Isua Greenstone Belt (IGB). Soon afterwards the biological nature of these objects was questioned on a number of grounds by several authors.

Following renewed, recent claims for biogenicity, the locality has been revisited and the host-rock (metamorphosed chert) to the putative microfossils re-examined. Extreme stretching deformation of the metachert cannot possibly have preserved syn-depositional spherical objects. We conclude that the objects (whether biological or not) are entirely post-tectonic and probably result from pre-Quaternary weathering.

OriginalsprogEngelsk
Sider (fra-til)309-312
Antal sider4
TidsskriftPrecambrian Research
Vol/bind126
Udgave nummer3-4
DOI
StatusUdgivet - 10 okt. 2003

Programområde

  • Programområde 4: Mineralske råstoffer

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