Mantle heterogeneity beneath the Antarctic-Phoenix ridge off Antarctica peninsula
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- Mantle heterogeneity beneath the Antarctic-Phoenix ridge off Antarctica peninsula
- Other Titles
- 남극-피닉스 해령 하부 맨틀의 이질성
- Choe, Won Hie
Choi, Sung Hi
Lee, Jong Ik
- Anarctic-Phoenix ridge; E-type MORB; Sr-Nd-Pb isotope; heterogeneity
- Issue Date
- Choe, Won Hie, Choi, Sung Hi, Lee, Jong Ik. 2008. "Mantle heterogeneity beneath the Antarctic-Phoenix ridge off Antarctica peninsula". ISLAND ARC, 17(1): 172-182.
- 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 sub-ridge mantle source. There are no known hotspots in close proximity to the site. We observe that small scale isotopic heterogeneity does exist at shallow level in the sub-axial mantle of the APR. Enriched (E-type) mid-ocean ridge basalts (MORB) coexist with the normal (N-type) MORBs in this region. The E-type basalts are (1) relatively young compared to the N-type samples, (2) were erupted after the extinction of the APR, and (3) 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 the geochemically enriched materials dispersed in ambient depleted mantle might have been the first fraction to melt to form the E-type basalts.
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