Silicic volcanism and hydrothermal activity documented at Pacific-Antarctic Ridge.

Stoffers, Peter, Worthington, T., Hekinian, R., Petersen, S., Hannington, M. D. and Türkay, M. and SO 157 Shipboard Scientific Party (2002) Silicic volcanism and hydrothermal activity documented at Pacific-Antarctic Ridge. Open Access Eos, Transactions American Geophysical Union, 83 (28). pp. 301-304. DOI 10.1029/2002EO000215.

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How well do we know the composition of oceanic crust? Countless studies have described the occurrence of mid-ocean ridge basalt (MORB) at spreading centers, and few would argue that the bulk composition of oceanic crust is other than basaltic. Nevertheless, silicic volcanism (>55 wt.% SiO2) does occur along part of the northern East Pacific Rise (10.5°N; Thompson et al. [1989]),on the 095° propagator of the Galápagos Spreading Center [Clague et al., 1981],and was recently discovered on the Pacific-Antarctic Ridge (PAR) near its intersection with the Foundation seamount chain [Hekinian et al., 1997, 1999]. Silicic lavas were recovered from a 290-km-long section of the northern PAR adjacent to the active Foundation plume (Figure 1) during cruise 157 of the F/S Sonne, which took place in June and July 2001. Furthermore, widespread hydrothermal activity indicates that the volcanogenic massive sulfidesilicic lava association is not only restricted to subduction and back arc settings.

Document Type: Article
Keywords: Silicic volcanism; hydrothermal activity; Pacific-Antarctic Ridge
Research affiliation: Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2002EO000215
ISSN: 0096-3941
Date Deposited: 25 Feb 2014 09:22
Last Modified: 12 Mar 2014 11:30

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