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Origin of E-MORB in a fossil spreading center: the Antarctic-Phoenix Ridge, Drake Passage, Antarctica

Cited 21 time in scopus
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Title
Origin of E-MORB in a fossil spreading center: the Antarctic-Phoenix Ridge, Drake Passage, Antarctica
Other Titles
남극 드레이크해협 Antarctic-Phoenix 해령에서의 E-MORB의 기원
Authors
Choe, Won Hie
Hur, Soon Do
Jin, Young Keun
Lee, Mi Jung
Lee, Jong Ik
Subject
Life Sciences & Biomedicine - Other Topics; Physiology
Keywords
Antarctic-Phenix Ridge; E-MORB; extinction of spreading; low-degree melting; mantle heterogeneity
Issue Date
2007
Citation
Choe, Won Hie, et al. 2007. "Origin of E-MORB in a fossil spreading center: the Antarctic-Phoenix Ridge, Drake Passage, Antarctica". GEOSCIENCES JOURNAL, 11(3): 185-199.
Abstract
The fossilized Antarctic-Phoenix Ridge (APR) with three segments (PI, P2, and P3), Drake Passage, is distant from the known hotspots, and consists of older N-MORIB formed prior to the extinction of spreading and younger E-MORB after extinction. The older N-MORB (3.5-6.4 Ma) occur in the southeastern flank of the P3 segment (PR3) and the younger E-MORB (1.4-3.1 Ma) comprise a huge seamount at the former ridge axis of the P3 segment (SPR) and a big volcanic edifice at the northwestern flank of the P2 segment (PR2). The PR3 basalts have higher Mg#, K/Ba, and CaO/Al2O3 and lower Zr/Y, Sr, and Na-8.0(fractionation-corrected Na2O to 8.0% MgO) with slight enrichment in incompatible elements and almost flat REE patterns. The SPR and PR2 basalts are highly enriched in incompatible elements and LREE. The extinction of spreading at 3.3 Ma seems to have led to a temporary magma oversupply with E-MORB signatures. Geochernical signatures such as Ba/TiO2, Ba/La, and SmALa suggest the heterogeneity of upper mantle and formation of E-MORB by higher contribution of enriched materials (e.g., metasomatized veins) to mantle melting than the N-MORB environment. E-MORB magmas beneath the APR seem to have been produced by low-degree melting at deeper regime, where enriched materials have preferentially participated in the melting. The occurrence of E-MORB at the APR is a good example to better understand what kinds of magmatism would occur in association with extinction of the ridge spreading.
URI
http://repository.kopri.re.kr/handle/201206/6130
DOI
http://dx.doi.org/10.1007/BF02913932
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