Axial seamount basalts in P3 segment of Phoenix Ridge, Drake passage Antarctica: K-Ar age determination and geochemistry SCOPUS KCI

Title
Axial seamount basalts in P3 segment of Phoenix Ridge, Drake passage Antarctica: K-Ar age determination and geochemistry
Author(s)
Lee, J.I.; Hur, S.D.; Lee, M.J.; Kim, K.J.; Nagao, K.
Publication Year
2003
Abstract
The axial seamount basalts in the P3 segment of the Phoenix Ridge were obtained from dredging and the K-Ar age determination and whole-rock geochemical analyses have been done for understanding their origin. The K-Ar ages for PR2 basalts sampled from 1,000 m below sea level are 2.6 - 2.2 Ma and those for PR3 basalts from 800 m are 1.6-1.5 Ma. The younger ages towards the crest of the seamount indicate that this submarine volcano has been grown by central eruptions. The youngest age of about 1.5 Ma for PR3 basalts corresponds to the final eruption period of this volcano. The seamount basalts contain small amounts of normative quartz and olivine. They have transitional geochemical nature between alkaline- and subalkaline-series basalts. Trace and rare earth elements compositions of the seamount basalts are very similar to those of ocean island basalts (OIB), and indicate that this seamount has been formed by a hotspot activity, not in association with a seafloor spreading. The melting degree from the source has decreased with time, and finally the volcanic activity has stopped when the basaltic magma reached mild alkaline composition.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5580
DOI
10.4217/OPR.2003.25.1.107
Bibliographic Citation
Ocean and Polar Research, v.25, no.1, pp.107 - 118, 2003
Publisher
Korea Ocean Research and Development Institute
Keywords
Axial seamount; Hotspot-type volcanism; K-Ar age; Phoenix Ridge
Type
Article
Language
Korean
Document Type
Article
Publisher
Korea Ocean Research and Development Institute
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