Silica precipitation triggered by clastic sedimentation in the Archean: New petrographic evidence from cherts of the Kromberg type section, South Africa

Morgane Ledevin, Nicholas Arndt, Alexandre Simionovici, Etienne Jaillard, Marc Ulrich

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11 Citations (Scopus)

Abstract

The Kromberg Formation (ca. 3432Ma) in the Barberton Greenstone Belt, South Africa, contains well-preserved chert beds at the tops of turbidite deposits. At the interface, siltstone, which consist of K-feldspar, K-mica, microquartz with minor lithic fragments and heavy minerals, grades into chert, which consists of microquartz and minor K-mica (2 to the bulk composition, and (2) another phase that dominates the trace element composition. Here, K-mica and K-feldspar control the chemical signal and reflect a felsic source to the turbidites (i.e. Hooggenoeg dacites and volcaniclastics).

Original languageEnglish
Pages (from-to)316-334
Number of pages19
JournalPrecambrian Research
Volume255
Issue numberP1
DOIs
Publication statusPublished - Dec 1 2014
Externally publishedYes

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Keywords

  • Archean
  • Barberton Greenstone Belt
  • Chert
  • Kromberg formation
  • Metasomatism
  • Siliceous ooze
  • Turbidite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology

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