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New hydrothermal activity and alkalic volcanism in the backarc Coriolis Troughs, Vanuatu
Citation
McConachy, TF and Arculus, RJ and Yeats, CJ and Binns, RA and Barringa, FJAS and McInnes, BIA and Sestak, S and Sharpe, R and Rakau, B and Tevi, T, New hydrothermal activity and alkalic volcanism in the backarc Coriolis Troughs, Vanuatu, Geology, 33, (1) pp. 61-64. ISSN 0091-7613 (2005) [Refereed Article]
DOI: doi:10.1130/G20870.1
Abstract
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 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. © 2005 Geological Society of America.
Item Details
Item Type: | Refereed Article |
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Research Division: | Earth Sciences |
Research Group: | Geology |
Research Field: | Igneous and metamorphic petrology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Sharpe, R (Dr Robina Sharpe) |
ID Code: | 39073 |
Year Published: | 2005 |
Web of Science® Times Cited: | 16 |
Deposited By: | Centre for Ore Deposit Research - CODES CoE |
Deposited On: | 2005-08-01 |
Last Modified: | 2006-05-05 |
Downloads: | 0 |
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