Deutsch
 
Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT
  Paleomagnetism of 3.5-4.0 Ga zircons from the Barberton Greenstone Belt, South Africa

Fu, R. R., Drabon, N., Wiedenbeck, M., Brenner, A. R., Lowe, D. R., Borlina, C. S. (2021): Paleomagnetism of 3.5-4.0 Ga zircons from the Barberton Greenstone Belt, South Africa. - Earth and Planetary Science Letters, 567, 116999.
https://doi.org/10.1016/j.epsl.2021.116999

Item is

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Fu, Roger R.1, 2, Autor
Drabon, Nadja1, 2, Autor
Wiedenbeck, Michael2, 3, Autor              
Brenner, Alec R.1, 2, Autor
Lowe, Donald R.1, 2, Autor
Borlina, Cauê S.1, 2, Autor
Affiliations:
1External Organizations, ou_persistent22              
2GFZ SIMS Publications, Deutsches GeoForschungsZentrum, Potsdam, ou_1692888              
33.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146040              

Inhalt

einblenden:
ausblenden:
Schlagwörter: paleomagnetism, geodynamo, geophysics, zircons, rock magnetism, Barberton Greenstone Belt
 Zusammenfassung: The existence of a core dynamo during the first billion years of Earth history is closely related to the thermal state of the Earth’s interior and composition of the early atmosphere. The scarcity of well-preserved rock units older than 3.5 billion years (Ga) has motivated the paleomagnetic analysis of detrital zircons. Studies of zircons from Jack Hills, Australia, however, have found the pervasive occurrence of secondary ferromagnetic minerals, casting doubt on the ability of these zircons to record a >3.5Ga geomagnetic field. Here we report paleomagnetic analyses on a set of 19 zircons with crystallization age 3.5-4.0Ga from the Barberton Greenstone Belt (BGB) of South Africa, which have undergone lower grade metamorphism compared to all other known >3.5Ga detrital zircon localities. We find that BGB zircons have magnetic moments nearly one order of magnitude weaker than Jack Hills zircons, precluding the retention of primary paleomagnetic information. This result corroborates findings from the Jack Hills and other Archean zircon populations that primary ferromagnetic inclusions are readily eliminated from zircons during sedimentary transport and metamorphism, likely facilitated by radiation damage-induced permeability. Paleomagnetic determination of geodynamo activity prior to 3.5Ga may require investigation of other detrital grains with lower radiation damage potential or whole-rock samples that have escaped high degree metamorphism.

Details

einblenden:
ausblenden:
Sprache(n): eng - Englisch
 Datum: 2021-05-0820212021
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1016/j.epsl.2021.116999
GFZPOF: p4 MESI
GFZPOFWEITERE: p4 T3 Restless Earth
 Art des Abschluß: -

Veranstaltung

einblenden:

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: Earth and Planetary Science Letters
Genre der Quelle: Zeitschrift, SCI, Scopus
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 567 Artikelnummer: 116999 Start- / Endseite: - Identifikator: ISSN: 0012-821X
ISSN: 1385-013X
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals99
Publisher: Elsevier