Submarine volcanoes and high-temperature hydrothermal venting on the Tonga arc, southwest Pacific.

Stoffers, Peter, Worthington, T. J., Schwarz-Schampera, U., Hannington, M. D., Massoth, G. J., Hekinian, R., Schmidt, Mark , Lundsten, L. J., Evans, L. J., Vaiomo'unga, R. and Kerby, T. (2006) Submarine volcanoes and high-temperature hydrothermal venting on the Tonga arc, southwest Pacific. Geology, 34 (6). pp. 453-456. DOI 10.1130/g22227.1.

[img] Text
Stoffers et al 2006.pdf - Published Version
Restricted to Registered users only

Download (649Kb) | Contact

Supplementary data:

Abstract

Submarine hydrothermal vents and associated sealfoor mineralization on the Tonga arc have been found for the first time, in the summit calderas of two shallow-water volcanoes, greatly extending the known areas and diversity of seafloor hydrothermal activity in the western Pacific region. The highest temperature vents (245-265 degrees C) occur at water depths of 385-540 m near the summit of one volcano at 24 degrees S. The vents are spatially related to basaltic dike swarms exposed at a summit cone and in the caldera walls. Clusters of large (to 10 m high) barite, anhydrite, and sulfide chimneys on the summit cone are vigorously discharging clear hydrothermal fluids with temperatures on the seawater boiling curve. There is abundant evidence of phase separation, which can be seen as flame-like jets of steam (H2O vapor) at the chimney orifices. Pyrite, marcasite, sphalerite, and chalcopyrite line the interiors of the highest temperature vents, similar to black smoker chimneys on the mid-ocean ridges.

Document Type: Article
Keywords: Tonga arc, submarine hydrothermal vents, boiling, sulfide-sulfate, chimneys, De-Fuca Ridge, evolution, fluids
Research affiliation: Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1130/g22227.1
ISSN: 0091-7613
Date Deposited: 12 Jan 2012 05:11
Last Modified: 09 Aug 2017 08:28
URI: http://oceanrep.geomar.de/id/eprint/16024

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...