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New hydrothermal activity and alkalic volcanism in the backarc Coriolis Troughs, Vanuatu

McConachy, Timothy F; Arculus, Richard; Yeats, Christopher; Binns, Raymond; Barriga, Fernando; McInness, Brent; Sestak, Stephen; Sharpe, Robina; Rakau, Brooks; Tevi, Tony

Description

The Vanuatu Australia Vents Expedition (VAVE) to the Coriolis Troughs in southern Vanuatu during September 2001 aboard the RV Franklin discovered a new hydrothermall vent field-herein informally named Nifonea-and recent alkallic volcanic activity. The Nifonea field in the central Vate Trough was located by coincident light transmission and CH4 anomalies in a hydrothermal plume of ∼60 km2 extent, best developed between 1600 and 1750 m depth at ∼150 m above the seafloor. Extensive hydrothermal...[Show more]

dc.contributor.authorMcConachy, Timothy F
dc.contributor.authorArculus, Richard
dc.contributor.authorYeats, Christopher
dc.contributor.authorBinns, Raymond
dc.contributor.authorBarriga, Fernando
dc.contributor.authorMcInness, Brent
dc.contributor.authorSestak, Stephen
dc.contributor.authorSharpe, Robina
dc.contributor.authorRakau, Brooks
dc.contributor.authorTevi, Tony
dc.date.accessioned2015-12-13T22:43:34Z
dc.date.available2015-12-13T22:43:34Z
dc.identifier.issn0091-7613
dc.identifier.urihttp://hdl.handle.net/1885/79254
dc.description.abstractThe Vanuatu Australia Vents Expedition (VAVE) to the Coriolis Troughs in southern Vanuatu during September 2001 aboard the RV Franklin discovered a new hydrothermall vent field-herein informally named Nifonea-and recent alkallic volcanic activity. The Nifonea field in the central Vate Trough was located by coincident light transmission and CH4 anomalies in a hydrothermal plume of ∼60 km2 extent, best developed between 1600 and 1750 m depth at ∼150 m above the seafloor. Extensive hydrothermal fauna and yellow-brown crusts and mounds cover an area of ∼1 km2. Very fresh, glassy, variably vesicular, sparsely phyric and aphyric basalt, trachybasalt, and basaltic trachyandesite (with ∼5-6 wt% combined alkalies at ∼ 51%-53% SiO2 and enriched light rare earth elements, Nb, and Zr) samples were dredged from youthful curtain, tube, and sheet flows, plus iron oxyhydroxide deposits. The alkalic composition of lavas in this tectonic setting is unique and attributed to thin ocean crust being developed in an incipient rifting phase involving a relatively low percentage of source-mantle melting. The Coriolis Troughs are among Earth's most youthful backarc basins and thus provide valuable insights to incipient rifting and hydrothermal processes.
dc.publisherGeological Society of America Inc
dc.sourceGeology
dc.subjectKeywords: Alkalic volcanic activity; Hydrothermal processes; Ocean crust; Vanautu Australia Vents Expedition (VAVE); Light transmission; Melting; Rare earth elements; Silica; Tectonics; Thermal plumes; Vents; Volcanic rocks; Hydrothermal synthesis; alkaline rock; b Backarc; Hydrothermal processes; Iron oxyhydroxides; Trachyandesite; Vanuatu
dc.titleNew hydrothermal activity and alkalic volcanism in the backarc Coriolis Troughs, Vanuatu
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume33
dc.date.issued2005
local.identifier.absfor040502 - Chemical Oceanography
local.identifier.absfor040304 - Igneous and Metamorphic Petrology
local.identifier.ariespublicationMigratedxPub7736
local.type.statusPublished Version
local.contributor.affiliationMcConachy, Timothy F, CSIRO Exploration and Mining
local.contributor.affiliationArculus, Richard, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationYeats, Christopher, CSIRO Division of Exploration & Mining
local.contributor.affiliationBinns, Raymond, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBarriga, Fernando, University of Lisbon
local.contributor.affiliationMcInness, Brent, CSIRO Petroleum
local.contributor.affiliationSestak, Stephen, CSIRO Petroleum
local.contributor.affiliationSharpe, Robina, University of Tasmania
local.contributor.affiliationRakau, Brooks, Mines & Water Resources, Vanuatu
local.contributor.affiliationTevi, Tony, Mines & Water Resources, Vanuatu
local.bibliographicCitation.issue1
local.bibliographicCitation.startpage61
local.bibliographicCitation.lastpage64
local.identifier.doi10.1130/G20870.1
dc.date.updated2015-12-11T10:13:09Z
local.identifier.scopusID2-s2.0-19944433103
CollectionsANU Research Publications

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