Origin of zeolites from the Kirkpatrick basalt, Solo Nunatak, Antarctica: significance to the petrogenesis of basalt
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Date
1984-06
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Publisher
The Ohio State University
Abstract
The Kirkpatrick Basalt has an anomalously high initial
87Sr/86Sr ratio which varies from 0.709 to 0.714. One
possible cause for the Sr isotopic anomaly is the alteration
of the basalt by the solutions which precipitated zeolites
in the vesicles of the basalt. In this study, zeolites from
the Kirkpatrick Basalt of Solo Nunatak, North Victoria Land,
Antarctica, were found to have identical initial 87Sr/86Sr
ratios (0.7100 to 0.7105) as the Kirkpatrick Basalt flows in
which they occurred. Therefore, the zeolites formed soon after
crystallization of the basalt with Sr derived from the basalt.
Because the Sr of the zeolite-forming solutions was derived
from the basalt, the Sr isotopic composition of the basalt was
not altered by the zeolite-forming solutions.