Plume —lid interactions during the Archean and implications for the generation of early continental crust

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Abstract
<jats:p>Many Archean terranes are interpreted to have a tectonic and metamorphic evolution that indicatesintra-crustal reorganization driven by lithospheric-scale gravitational instabilities. These processesare associated with the production of a significant amount of felsic and mafic crust, and are widelyregarded to be a consequence of plume-lithosphere interactions. The juvenile Archean felsic crustis made predominantly of rocks of the tonalite–trondhjemite–granodiorite (TTG) suite, which arethe result of partial melting of hydrous metabasalts. The geodynamic processes that have assistedthe production of juvenile felsic crust, are still not well understood. Here, we perform 2D and 3Dnumerical simulations coupled with the state-of-the-art of petrological thermodynamical modellingto study the tectonic evolution of a primitive Archean oceanic plateau with particular regard on thecondition of extraction of felsic melts. In our numerical simulations, the continuous emplacementof new, dry mafic intrusions and the extraction of the felsic melts, generate an unstable lowercrust which drips into the mantle soon after the plume arrival. The subsequent tectonic evolutiondepends on the asthenosphere T P . If the T P is high enough (≥ 1500 ◦ C) the entire oceanic crust isrecycled within 2 Myrs. By contrast at low T P , the thin oceanic plateau slowly propagates generatingplate-boundary like features.</jats:p>
Date of acceptance
2021
Autoren
  • Andrea Piccolo
  • Richard White
  • Boris Kaus
  • Richard Palin
  • Georg Reuber
DOI
10.31223/x5rg83
Datum der Veröffentlichung
2022
Status
Published
Herausgeber URL
http://dx.doi.org/10.31223/x5rg83
Datum der Datenerfassung
2022
Titel
Plume —lid interactions during the Archean and implications for the generation of early continental crust

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