Isuasphaera isua (Pflug) revisited

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

doi:10.1016/S0301-9268(03)00101-3

Isuasphaera isua (Pflug) revisited

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

Afdeling for Kortlægning og Mineralske Råstoffer

Publikation: Bidrag til tidsskrift › Artikel › Forskning › peer review

14 Citationer (Scopus)

Resumé

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.

Originalsprog	Engelsk
Sider (fra-til)	309-312
Antal sider	4
Tidsskrift	Precambrian Research
Vol/bind	126
Udgave nummer	3-4
DOI	https://doi.org/10.1016/S0301-9268(03)00101-3
Status	Udgivet - 10 okt. 2003

Programområde

Programområde 4: Mineralske råstoffer

Adgang til dokumentet

10.1016/S0301-9268(03)00101-3

Citationsformater

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title = "Isuasphaera isua (Pflug) revisited",

abstract = "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.",

keywords = "Isua Greenstone Belt, Isuasphaera isua, Microfossils",

author = "Appel, {Peter W.U.} and Stephen Moorbath and Myers, {John S.}",

note = "Funding Information: We thank the Danish Natural Science Research Council, the Commission for Scientific Research in Greenland, and the Bureau of Minerals and Petroleum, Nuuk, Greenland, for generous support of the Isua Multidisciplinary Research Project, to which this is a contribution. This article is published with the permission of the Geological Survey of Denmark and Greenland.",

year = "2003",

month = oct,

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doi = "10.1016/S0301-9268(03)00101-3",

language = "English",

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pages = "309--312",

journal = "Precambrian Research",

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TY - JOUR

T1 - Isuasphaera isua (Pflug) revisited

AU - Appel, Peter W.U.

AU - Moorbath, Stephen

AU - Myers, John S.

N1 - Funding Information: We thank the Danish Natural Science Research Council, the Commission for Scientific Research in Greenland, and the Bureau of Minerals and Petroleum, Nuuk, Greenland, for generous support of the Isua Multidisciplinary Research Project, to which this is a contribution. This article is published with the permission of the Geological Survey of Denmark and Greenland.

PY - 2003/10/10

Y1 - 2003/10/10

N2 - 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.

AB - 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.

KW - Isua Greenstone Belt

KW - Isuasphaera isua

KW - Microfossils

UR - http://www.scopus.com/inward/record.url?scp=0348111511&partnerID=8YFLogxK

U2 - 10.1016/S0301-9268(03)00101-3

DO - 10.1016/S0301-9268(03)00101-3

M3 - Article

SN - 0301-9268

VL - 126

SP - 309

EP - 312

JO - Precambrian Research

JF - Precambrian Research

IS - 3-4

ER -

Isuasphaera isua (Pflug) revisited

Resumé

Programområde

Adgang til dokumentet

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Citationsformater