Anomalous neon and xenon in an Archaean anorthosite from West Greenland

Details Anomalous neon and xenon in an Archaean anorthosite from West Greenland Anomalous neon and xenon in an Archaean anorthosite from West Greenland

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.114..341a&link_type=abstract

Earth and Planetary Science Letters, Volume 114, Issue 2-3, p. 341-352.

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Large excesses of 129Xe, 131Xe and 132Xe relative to the atmospheric Xe were first reported by Jeffery in an Archaean anorthosite (2.9 Ga) from the Fiskenæsset Complex in West Greenland. Later, Zadnik and Jeffery observed excess 21Ne and 22Ne in the same anorthosite. Since the isotopic anomalies recorded in the rock may be a reflection of specific Archaean geological conditions, we decided to re-examine the problem. We studied an anorthosite from the same complex. Hornblende and anorthite were separated from the anorthosite and isotopic analyses were carried out on the mineral separates.
Xe is essentially atmospheric, except for minor excesses of Xe produced by 238U spontaneous fission in gases released from hornblende at higher temperatures in stepped heating experiments. The result did not confirm earlier observations. However, we also observed considerable excesses of both 21Ne and 22Ne, in accordance with the results of Zadnik and Jeffery, and consistent with nucleogenic Ne in many fluids in the crust. The former excess is most reasonably attributable to 18O(α, n)21Ne, and the latter to 19F(α, n) --> 22Ne. We conclude that these excesses are trapped components and that this anorthosite trapped these excess noble gases from a hydrous fluid derived from a crustal region enriched in U, Th and F during the 2.9 Ga metamorphism.

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