Variations in 39 K / 41 K ratio and movement of potassium in heated and stressed xenoliths

Details Variations in 39 K / 41 K ratio and movement of potassium in heated and stressed xenoliths Variations in 39 K / 41 K ratio and movement of potassium in heated and stressed xenoliths

Jul 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35..719s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 35, Issue 7, pp.719-726

Physics

Scientific paper

The 39 K / 41 K ratio was measured in fifty hand samples taken from different positions from felspathic xenoliths contained in the flow deposit of limestone at Changalumi. The small xenoliths (< 150 cm dia.) are randomly oriented in the limestone flow pattern and show no internal differentiation. The larger xenoliths are oriented along the flow of the limestone and are differentiated into three zones. These are a rim zone (approximately 30 cm), a transitional zone (up to 200 cm) and an apparently unaltered core zone. 39 K / 41 K values for all four small xenoliths sampled (12 samples) are all indistinguishable at 99 per cent no matter where the hand sample was taken. The values of this ratio in 38 samples in the larger xenoliths showed a consistent pattern depending upon the zone from which the sample was taken. The rim zone values were all distinguishably lower, and the core zone values distinguishably higher (at the 99 per cent confidence limit) than the constant value for the small xenoliths. The transition zone values were intermediate. The interpretation is given that the combined effect of heat and stress in the oriented xenoliths has caused a migration of potassium from the outer rim zone toward the core zone. The mechanism of transport has involved a process of activated diffusion which results in the enrichment of 39K in the direction of movement of potassium. Concentration measurements of potassium in both types of xenolith confirm this interpretation.

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