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Geochemistry of Basalt from the Eastern Woodlark Basin: Its Implications for the Mantle Heterogeneity

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Title
Geochemistry of Basalt from the Eastern Woodlark Basin: Its Implications for the Mantle Heterogeneity
Other Titles
동 우드락 분지 현무암에 대한 지화학적 특성: 맨틀 불균질성에 대한 함의
Authors
Park, Sung Hyun
Peter Michael
Lee, Jong Ik
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Keywords
Basalt; Mantle Heterogeneity; Subduction Components; Woodlark Basin
Issue Date
2007
Citation
Park, Sung Hyun, et al. 2007. Geochemistry of Basalt from the Eastern Woodlark Basin: Its Implications for the Mantle Heterogeneity. Cambridge. Cambridge. 2007.08.20~.
Abstract
A section of the active spreading center in the eastern Woodlark Basin (EWLB) is subducting beneath the New Georgia Group, a volcanic arc. Basalt from the axis of EWLB were analyzed to investigate the processes in the region where ridge subduction and reversal in subduction polarity occurred in the past. They are similar to N-MORB in their major oxides, but are more depleted in incompatible elements. Incompatible element ratios such as Zr/Y and La/Sm show a large variation, which may be explained by mantle heterogeneity where an N-MORB source became mixed with or coexists with a different, mantle source that was depleted at an earlier time. The negative correlation between Ba/La and Zr/Y ratios indicates that the prior depleted end member is more enriched in the subduction component than the N-MORB mantle source and therefore may have originated from a subduction environment. The source of the subduction component remains to be explored by further studies.
URI
http://repository.kopri.re.kr/handle/201206/7759
Conference Name
Cambridge
Conference Place
Cambridge
Conference Date
2007.08.20~
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