30,000 Years of Hydrothermal Activity at the Lost City Vent Field
Gretchen L. Früh-Green,1*
Deborah S. Kelley,2
Stefano M. Bernasconi,1
Jeffrey A. Karson,3
Kristin A. Ludwig,2
David A. Butterfield,4
Chiara Boschi,1
Giora Proskurowski2
Strontium, carbon, and oxygen isotope data and radiocarbon ages document at least 30,000 years of hydrothermal activity driven by serpentinization reactions at Lost City. Serpentinization beneath this off-axis field is estimated to occur at a minimum rate of 1.2 x 10–4 cubic kilometers per year. The access of seawater to relatively cool, fresh peridotite, coupled with faulting, volumetric expansion, and mass wasting processes, are crucial to sustain such systems. The amount of heat produced by serpentinization of peridotite massifs, typical of slow and ultraslow spreading environments, has the potential to drive Lost City–type systems for hundreds of thousands, possibly millions, of years.
1 Department of Earth Sciences, Eidgenössische Technische Hochschule, Zürich (ETH-Z), CH-8092 Zurich, Switzerland. 2 School of Oceanography, University of Washington, Seattle, WA 98195, USA. 3 Division of Earth and Ocean Sciences, Duke University, Durham, NC 27708–0230, USA. 4 University of Washington and National Oceanographic and Atmospheric Administration–Pacific Marine Environmental Laboratory, Seattle, WA 98195, USA.
* To whom correspondence should be addressed. E-mail: gretli{at}erdw.ethz.ch
