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Mantle heterogeneity beneath the Antarctic-Phoenix Ridge in the Drake Passage, Antarctica

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Title
Mantle heterogeneity beneath the Antarctic-Phoenix Ridge in the Drake Passage, Antarctica
Other Titles
남극 드레이크 해협내의 남극-피닉스 해령 하부 맨틀의 이징성
Authors
Choi, Sung Hi
Lee, Jong Ik
최원희
Keywords
Antarctic-Phoenix Ridge; mantle heterogeneity
Issue Date
2007
Citation
Choi, Sung Hi, Lee, Jong Ik, 최원희. 2007. Mantle heterogeneity beneath the Antarctic-Phoenix Ridge in the Drake Passage, Antarctica. UC Santa Barbara. UC Santa Barbara. 2007.08.26~.
Abstract
We determined Sr, Nd and Pb isotopic compositions for basalts recovered from the fossilized Antarctic-Phoenix Ridge (APR) in the Drake Passage, Antarctica, in order to understand the nature of a sub-ridge mantle source. Enriched (E-type) mid-ocean ridge basalts (MORB) coexist with the normal (N-type) MORBs in the axial region of the APR. There are no known hotspots in close proximity to the site. The E-type basalts are relatively young compared to the N-type samples and were erupted after the extinction of the APR. The E-type melts have been generated by low-degree of partial melting of an enriched mantle source. Extinction of the APR is likely to cause the extent of partial melting in this region to decrease. We interpret that geochemically enriched mantle might exist as a form of highly localized spots or veins in ambient depleted mantle of this region, and were the first fraction to melt to form the E-type basalts.
URI
http://repository.kopri.re.kr/handle/201206/7738
Conference Name
UC Santa Barbara
Conference Place
UC Santa Barbara
Conference Date
2007.08.26~
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