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SrRbK and Sr isotopic relationships in ultramafic rocks, southeastern Alaska

Earth and Planetary Science Letters

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Abstract

Geologic evidence suggests that a series of ultramafic complexes of the 'Duke Island type' located along a 560 km-long belt in southeastern Alaska crystallized from magmas of ultramafic composition. Some geologists have proposed that these magmas were derived by fractional fusion of ultramafic material in the upper mantle. The 87Sr/86Sr ratios, corrected for growth of radiogenic 87Sr, in total rock samples and in minerals from four ultramafic complexes range from 0.7026 to 0.7068, and the K/Rb ratios in total rock samples range from 300 to 1200. Other workers have reported that the isotopic composition of strontium in alpine peridotites is significantly different from that of oceanic volcanic rocks, but the 87Sr/86Sr ratios of the Alaskan ultramafites and of oceanic volcanic rocks are similar. ?? 1968.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
SrRbK and Sr isotopic relationships in ultramafic rocks, southeastern Alaska
Series title:
Earth and Planetary Science Letters
Volume
4
Issue:
3
Year Published:
1968
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Earth and Planetary Science Letters
First page:
185
Last page:
190