thumbnail

Hafnium isotope results from mid-ocean ridges and Kerguelen.

LITHOS

By:
DOI: 10.1016/0024-4937(83)90033-6

Links

Abstract

176Hf/177Hf ratios are presented for oceanic volcanic rocks representing both extremes of the range of mantle Hf-Nd-Sr isotopic variation. Hf from critical mid-ocean ridge basalts shows that 176Hf/177Hf does indeed have a greater variability than 143Nd/144Nd and 87Sr/86Sr in the depleted mantle. This extra variation is essentially of a random nature, and can perhaps be understood in terms of known Rb/Sr-Sm/Nd-Lu/Hf fractionation relationships. At the other extreme of mantle isotopic compositions, 176Hf/177Hf ratios for igneous rocks from the Indian Ocean island of Kerguelen show a closely similar variation to published 143Nd/144Nd ratios for the same samples. Comparison of Hf-Nd-Sr isotopic relatonships for Tristan da Cunha, Kerguelen and Samoa reveals divergences in the mantle array for ocean-island magma sources, and perhaps suggests that these irregularities are largely the result of an extra component of 87Sr/86Sr variation.-G.R.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Hafnium isotope results from mid-ocean ridges and Kerguelen.
Series title:
LITHOS
DOI:
10.1016/0024-4937(83)90033-6
Volume
16
Issue:
1
Year Published:
1983
Language:
English
Publisher:
Elsevier
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
LITHOS
First page:
47
Last page:
51
Number of Pages:
5