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Iron isotope fractionation during magmatic differentiation in Kilauea Iki lava lake

Science

By:
, ,
DOI: 10.1126/science.1157166

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Abstract

Magmatic differentiation helps produce the chemical and petrographic diversity of terrestrial rocks. The extent to which magmatic differentiation fractionates nonradiogenic isotopes is uncertain for some elements. We report analyses of iron isotopes in basalts from Kilauea Iki lava lake, Hawaii. The iron isotopic compositions (56Fe/54Fe) of late-stage melt veins are 0.2 per mil (???) greater than values for olivine cumulates. Olivine phenocrysts are up to 1.2??? lighter than those of whole rocks. These results demonstrate that iron isotopes fractionate during magmatic differentiation at both whole-rock and crystal scales. This characteristic of iron relative to the characteristics of magnesium and lithium, for which no fractionation has been found, may be related to its complex redox chemistry in magmatic systems and makes iron a potential tool for studying planetary differentiation.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Iron isotope fractionation during magmatic differentiation in Kilauea Iki lava lake
Series title:
Science
DOI:
10.1126/science.1157166
Volume
320
Issue:
5883
Year Published:
2008
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1620
Last page:
1622