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Mantle heterogeneity beneath the Phoenix ridge in the Drake Passage, Antarctica

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Title
Mantle heterogeneity beneath the Phoenix ridge in the Drake Passage, Antarctica
Other Titles
남극 드레이크해협내의 피닉스 해령 하부 맨틀의 이질성
Authors
Lee, Jong Ik
Choi, Sung Hi
최원희
Keywords
Antarctica; Phoenix Ridge; heterogeneity
Issue Date
2007
Citation
Lee, Jong Ik, Choi, Sung Hi, 최원희. 2007. Mantle heterogeneity beneath the Phoenix ridge in the Drake Passage, Antarctica. KOPRI. KOPRI. 2007.05.15~.
Abstract
We determined Sr, Nd and Pb isotopic compositions for basalts recovered from the fossilized Phoenix Ridge in the Drake Passage, Antarctica, in order to understand the nature of sub-ridge mantle source. We observe that small scale isotopic heterogeneity does exist at shallow level in the sub-axial mantle of the Phoenix Ridge, being distant from any known hotspots. Extinction of the Phoenix Ridge is likely to lead decreasing extent of partial melting in this region. We interpret that geochemically enriched materials dispersed in ambient depleted mantle were the first fraction to melt for generating the studied enriched mid-ocean ridge basalts (E-MORB) represented by relatively small extents of melt of enriched mantle source
URI
http://repository.kopri.re.kr/handle/201206/7737
Conference Name
KOPRI
Conference Place
KOPRI
Conference Date
2007.05.15~
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