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Radiometric ages of Kodiak Seamount and Giacomini Guyot, Gulf of Alaska: Implications for circum-pacific tectonics

Science

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Abstract

Kodiak Seamount and Giacomini Guyot have been dated at 22.6 ??1.1 and 19.9 ??1.0 [2?? (standard deviation)] X 106 years, respectively. Concordant whole-rock and plagioclase potassium-argon dates and fission-track apatite ages demonstrate that significant quantities of excess radiogenic 40Ar are not present in the dated samples. These seamounts are the northwesternmost edifices of the Pratt-Welker chain, which cuts obliquely across magnetic anomaly patterns in an older northeastern Pacific sea floor. The older of the two dated seamounts is in the Aleutian Trench, apparently about to be subducted. If one assumes that seamounts are generated by plate motion over a fixed hot spot in the mantle, a Pacific-plate motion of 6.6 centimeters per year during early Miocene time may be calculated.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Radiometric ages of Kodiak Seamount and Giacomini Guyot, Gulf of Alaska: Implications for circum-pacific tectonics
Series title:
Science
Volume
182
Issue:
4112
Year Published:
1973
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
579
Last page:
581
Number of Pages:
3