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 language | English (US) |
|---|---|
| Pages (from-to) | 147-153 |
| Number of pages | 7 |
| Journal | Mineralogy and Petrology |
| Volume | 104 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Mar 2012 |
| Externally published | Yes |
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.