Anomalous xenon in Archean cherts from Pilbara Craton, western Australia

Daniele L. Pinti, Jun Ichi Matsuda, Shigenori Maruyama

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We report the discovery of anomalies in the xenon isotopic composition of Archean cherts belonging to the metasedimentary sequences of Pilbara Craton, Western Australia. The cherts show contemporary excesses of 129Xe and 131-136Xe, compared to atmospheric Xe. The 129Xe excesses are comparable to those observed in mantle-derived samples, such as MORBs, xenoliths, diamonds and CO2-rich well gases and correlate with excesses of 238U fissiogenic-produced 136Xe, close to the mantle ratio. However, isotope 131Xe is in excess of 238U fissiogenic-Xe production. The 129Xe/131Xe ratio ranges from 0.7 to 3.2 and it is consistent with production of these two isotopes by neutron-capture reactions with tellurium. These anomalies are analogous to those measured in metamorphic rocks (gneisses and amphibolites) in the KTB borehole in Germany and probably were produced by reactions with Te.

Original languageEnglish
Pages (from-to)387-395
Number of pages9
JournalChemical Geology
Volume175
Issue number3-4
DOIs
Publication statusPublished - Jun 1 2001
Externally publishedYes

Fingerprint

Xenon
xenon
Isotopes
craton
Archean
KTB borehole
Tellurium
isotope
Metamorphic rocks
mantle
anomaly
tellurium
Diamond
gas well
Boreholes
mid-ocean ridge basalt
diamond
metamorphic rock
Neutrons
isotopic composition

Keywords

  • Archean
  • Barium
  • Chert
  • Pilbara
  • Tellurium
  • Xenon

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Anomalous xenon in Archean cherts from Pilbara Craton, western Australia. / Pinti, Daniele L.; Matsuda, Jun Ichi; Maruyama, Shigenori.

In: Chemical Geology, Vol. 175, No. 3-4, 01.06.2001, p. 387-395.

Research output: Contribution to journalArticle

Pinti, Daniele L. ; Matsuda, Jun Ichi ; Maruyama, Shigenori. / Anomalous xenon in Archean cherts from Pilbara Craton, western Australia. In: Chemical Geology. 2001 ; Vol. 175, No. 3-4. pp. 387-395.
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