Geochemistry and K-Ar Age of Alkali Basalts from Weno Island, Caroline Islands, Western Pacific SCOPUS KCI OTHER

Title
Geochemistry and K-Ar Age of Alkali Basalts from Weno Island, Caroline Islands, Western Pacific
Author(s)
Lee, J.I.; Hur, S.D.; Park, B.-K.; Han, S.J.
Publication Year
2001
Abstract
Geochemical and Sr-Nd isotopic compositions and K-Ar ages are analyzed in volcanic rocks from Weno Island, Caroline Islands. Seven Weno lava samples of alkali basalt and basaltic trachyandesite are aphyric or sparsely phyric comprising olivine, plagioclase, and clinopyroxene phenocrysts. Whole-rock geochemical variation of Weno lavas reflects main fractional crystallization of olivine and Cr-spinel phenocrysts. Newly determined K-Ar ages of Weno lavas range from 6.7 to 11.3 Ma (late Miocene), indicating their formation during primary volcanic stage of Chuuk Islands. Trace element compositions of Weno lavas are very similar to those of typical ocean island basalts (OIBs), suggesting their formation during intra-plate mantle plume activity. The plume composition is isotopically very similar to that of Hawaiian hot spot. However, the age span of Chuuk volcanism is longer than that of the other individual volcanoes in the Pacific.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5939
Bibliographic Citation
Ocean and Polar Research, v.23, no.1, pp.23 - 34, 2001
Keywords
Caroline Islands; Geochemistry; Hot spot; K-Ar age; Weno Island
Type
Article
Language
Korean
Document Type
Article
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