Low-Ca contents and kink-banded textures are not unique to mantle olivine: Evidence from the Duke Island Complex, Alaska

Chusi Li, Joyashish Thakurta, Edward M. Ripley

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Low-Ca contents and kink-banded textures in olivine with high Fo contents (>90 mol%) are widely used as indicators of mantle origin. Here we report the occurrence of this type of olivine in the peridotites of the Annette and Duke Island Complexes in southeastern Alaska which are interpreted to have formed at crustal depths. Our findings confirm that neither low-Ca contents nor kink-banded textures are unique to mantle olivine. Caution is warranted in using this type of olivine or peridotite xenoliths containing this type of olivine in volcanic rocks to decipher the nature of the mantle.

Original languageEnglish (US)
Pages (from-to)147-153
Number of pages7
JournalMineralogy and Petrology
Volume104
Issue number3-4
DOIs
StatePublished - Mar 2012
Externally publishedYes

Bibliographical note

Funding Information:
Field work was in part financially supported by a research grant to Thakurta from the College of Arts and Sciences, Ohio University. Helicopter support during field work was provided by Avalon Development Corporation (Fairbanks, Alaska) and Copper Ridge Explorations (Vancouver, British Columbia). We are thankful to the Metlakatla Indian Community for their assistance during field work at Annette Island. This study constitutes a small part of a research project funded by grants from the U.S. National Science Foundation (EAR–1016031) and the State Key Laboratory of Ore Deposit Geochemistry of China (200905). Constructive comments from two anonymous reviewers are greatly appreciated.

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