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First hydrothermal discoveries on the Australian-Antarctic Ridge: Discharge sites, plume chemistry, and vent organisms

Cited 17 time in wos
Cited 20 time in scopus

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DC Field Value Language
dc.contributor.authorHahm, Doshik-
dc.contributor.authorBaker, Edward T.-
dc.contributor.authorRhee, Tae Siek-
dc.contributor.authorWon, Yong-Jin-
dc.contributor.authorResing, Joseph A.-
dc.contributor.authorLupton, John E.-
dc.contributor.authorLee, Won-Kyung-
dc.contributor.authorKim, Minjeong-
dc.contributor.authorPark, Sung Hyun-
dc.coverage.spatialAustralian-Antarctic Ridge-
dc.coverage.spatialAntarctic-
dc.date.accessioned2017-08-03T12:12:36Z-
dc.date.available2017-08-03T12:12:36Z-
dc.date.issued2015-
dc.description.abstractThe Australian-Antarctic Ridge (AAR) is one of the largest unexplored regions of the global mid-ocean ridge system. Here, we report a multiyear effort to locate and characterize hydrothermal activity on two first-order segments of the AAR: KR1 and KR2. To locate vent sites on each segment, we used pro- files collected by Miniature Autonomous Plume Recorders on rock corers during R/V Araon cruises in March and December of 2011. Optical and oxidation-reduction-potential anomalies indicate multiple active sites on both segments. Seven profiles on KR2 found 3 sites, each separated by 25 km. Forty profiles on KR1 identified 17 sites, some within a few kilometer of each other. The spatial density of hydrothermal activity along KR1 and KR2 (plume incidence of 0.34) is consistent with the global trend for a spreading rate of 70 mm/yr. The densest area of hydrothermal activity, named ''Mujin,'' occurred along the 20 km-long inflated section near the segment center of KR1. Continuous plume surveys conducted in January-February of 2013 on R/V Araon found CH4/3He (1-15 x 106) and CH4/Mn (0.01-0.5) ratios in the plume samples, consistent with a basaltic-hosted system and typical of ridges with intermediate spreading rates. Addition- ally, some of the plume samples exhibited slightly higher ratios of H2/3He and Fe/Mn than others, suggesting that those plumes are supported by a younger hydrothermal system that may have experienced a recent eruption. The Mujin-field was populated by <em>Kiwa </em>crabs and seven-armed <em>Paulasterias</em> starfish previ- ously recorded on the East Scotia Ridge, raising the possibility of circum-Antarctic biogeographic connections of vent fauna.-
dc.languageEnglish-
dc.subjectGeochemistry & Geophysics-
dc.subject.classificationAraon-
dc.titleFirst hydrothermal discoveries on the Australian-Antarctic Ridge: Discharge sites, plume chemistry, and vent organisms-
dc.typeArticle-
dc.identifier.bibliographicCitationHahm, Doshik, et al. 2015. "First hydrothermal discoveries on the Australian-Antarctic Ridge: Discharge sites, plume chemistry, and vent organisms". <em>Geochem. Geophys. Geosyst.</em>, 16: 3061-3075.-
dc.citation.titleGeochem. Geophys. Geosyst.-
dc.citation.volume16-
dc.citation.page3061-3075-
dc.identifier.doi10.1002/2015GC005926-
dc.coverage.x62.16°S-
dc.coverage.x62.2°S-
dc.coverage.x62.23°S-
dc.coverage.y160°E-
dc.coverage.y152.5°E-
dc.subject.keywordAustralian-Antarctic Ridge-
dc.subject.keywordHydrothermal plume-
dc.subject.keywordVent organism-
dc.subject.keywordAntarctic-
dc.subject.keywordAraon-
dc.coverage.degreeX-62.16-
dc.coverage.degreeX-62.2-
dc.coverage.degreeX-62.23-
dc.coverage.degreeY160-
dc.coverage.degreeY152.5-
dc.identifier.scopusid2-s2.0-84944442186-
dc.identifier.wosid000365039400019-
Appears in Collections  
2014-2016, Evolution of West Antarctic Rift System (WARS): Study of Tectonic Activities and Volcanism Near The Adare Trough and Antarctic Mid-Ocean Ridges / Hong, Jong Kuk (PE14050; PE15050; PE16050)
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