Anomalous xenon in Archean cherts from Pilbara Craton, western Australia

Daniele L. Pinti; Jun Ichi Matsuda; Shigenori Maruyama

doi:10.1016/S0009-2541(00)00331-4

Anomalous xenon in Archean cherts from Pilbara Craton, western Australia

Daniele L. Pinti, Jun Ichi Matsuda, Shigenori Maruyama

Research output: Contribution to journal › Article › peer-review

10 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 language	English
Pages (from-to)	387-395
Number of pages	9
Journal	Chemical Geology
Volume	175
Issue number	3-4
DOIs	https://doi.org/10.1016/S0009-2541(00)00331-4
Publication status	Published - Jun 1 2001

Keywords

Archean
Barium
Chert
Pilbara
Tellurium
Xenon

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

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10.1016/S0009-2541(00)00331-4

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title = "Anomalous xenon in Archean cherts from Pilbara Craton, western Australia",

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.",

keywords = "Archean, Barium, Chert, Pilbara, Tellurium, Xenon",

author = "Pinti, {Daniele L.} and Matsuda, {Jun Ichi} and Shigenori Maruyama",

note = "Funding Information: We are particularly grateful to Prof. M. Ozima and B. Marty for their comments and their continuous encouragement and support throughout this work. The manuscript was largely improved by the stimulating comments of M. Moreira and an anonymous reviewer. We wish to thank J. Blockley and A. Glikson for their useful information about Pilbara ores; Ph. Sarda for his critical comments; I. Tolstikhin for providing his mantle xenon database; Y. Kato for unpublished data of U and Th in Pilbara cherts; S. Scaillet for helping with York's line fitting. Research of Dr. Pinti at Osaka University was supported by EC-JSPS grant (JSPS1-ST9) and the JSPS grant P96239.",

year = "2001",

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doi = "10.1016/S0009-2541(00)00331-4",

language = "English",

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journal = "Chemical Geology",

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T1 - Anomalous xenon in Archean cherts from Pilbara Craton, western Australia

AU - Pinti, Daniele L.

AU - Matsuda, Jun Ichi

AU - Maruyama, Shigenori

N1 - Funding Information: We are particularly grateful to Prof. M. Ozima and B. Marty for their comments and their continuous encouragement and support throughout this work. The manuscript was largely improved by the stimulating comments of M. Moreira and an anonymous reviewer. We wish to thank J. Blockley and A. Glikson for their useful information about Pilbara ores; Ph. Sarda for his critical comments; I. Tolstikhin for providing his mantle xenon database; Y. Kato for unpublished data of U and Th in Pilbara cherts; S. Scaillet for helping with York's line fitting. Research of Dr. Pinti at Osaka University was supported by EC-JSPS grant (JSPS1-ST9) and the JSPS grant P96239.

PY - 2001/6/1

Y1 - 2001/6/1

N2 - 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.

AB - 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.

KW - Archean

KW - Barium

KW - Chert

KW - Pilbara

KW - Tellurium

KW - Xenon

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SN - 0009-2541

VL - 175

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JO - Chemical Geology

JF - Chemical Geology

IS - 3-4

ER -

Anomalous xenon in Archean cherts from Pilbara Craton, western Australia

Abstract

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