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New seismic, heat flow, sediment and pore fluid geochemistry data from the east flank of Alarcon Ridge, at the mouth of the Gulf of California, provide evidence for vigorous hydrothermal circulation within young oceanic crust formed at a moderate-rate spreading center. Data and samples were collected 9^20 km from the ridge axis to assess the hydrologic(More)
Here we report on the flow system in a dominantly nonaccretionary subduction zone, located off the Pacific coast of northern Costa Rica (Fig. 1). Nonaccretionary subduction zones have greater opportunity to tap the fundamental fluid pathways coming from deep within the system (Fryer, 1996). These zones show much greater dewatering of subducted sediments ,(More)
The exogenic sulfur cycle is tightly coupled with the carbon and oxygen cycles, and therefore a central component of Earth's biogeochemistry. Here we present a high-resolution record of the sulfur isotopic composition of seawater sulfate for the Cretaceous. The general enrichment of isotopically light sulfur that prevailed during the Cretaceous may have(More)
The thermal structure of the western Nankai subduction zone has been studied through surface heat flow measurements with conventional geothermal probes and estimation of heat flow from depths of gas hydrate bottom simulating reflectors. Temperature and thermal conductivity measurements at ODP Site 808, located at the toe of the Nankai accretionary prism,(More)
  • Kori R Newman, Marie-Helene Cormier, Jeffrey K Weissel, Neal W Driscoll, Miriam Kastner, Evan A Solomon +5 others
  • 2007
Detailed near-bottom investigation of a series of giant, kilometer scale, elongate pockmarks along the edge of the mid-Atlantic continental shelf confirms that methane is actively venting at the site. Dissolved methane concentrations, which were measured with a commercially available methane sensor (METS) designed by Franatech GmbH mounted on an Autonomous(More)
  • Evan A Solomon, Arthur J Spivack, Miriam Kastner, Marta Torres, D V Borole, Gretchen Robertson +1 other
  • 2008
Natural gas hydrates occur on most continental margins in organic-rich sediments at water depths >450 m (in polar regions >150 m). Gas hydrate distribution and abundance, however, varies significantly from margin to margin and with tectonic environment. The National Gas Hydrate Program (NGHP) Expedition 01 cored 10 sites in the Krishna-Godawari (K-G) basin,(More)
  • Miriam Kastner, Arthur J Spivack, Marta Torres, Evan Solomon, D V Borole, Gretchen Robertson +6 others
  • 2008
To establish the structural and lithological controls on gas hydrate distribution and to assess the potential energy resource and environmental hazards in the Indian Ocean, non-pressurized and pressurized cores were recovered from the Krishna-Godavari (K-G) and Mahanadi Basins offshore east India, and from an Andaman Sea site. The pore fluids were analyzed(More)
  • Roland Von Huene, Erwin Suess, Audrey W Meyer, Jacques Bourgois, Jose Del, C Cruzado +28 others
  • 2007
This informal report was prepared from the shipboard files by the scientists who participated in the cruise. The report was assembled under time constraints and is not considered to be a formal publication which incorporates final works or conclusions of the participating scientists. The material contained herein is privileged proprietary information and(More)
  • B Y M I R I A M K A S T N, K E I R B E C K, S W J A N N A S C H, E Va, N A S O L O M O N, A N D G E O F F R E Y W, H E At +5 others
  • 2006
The hydrogeology of the oceanic crust infl uences numerous global processes and properties, including the thermal evolution of oceanic lithosphere, crustal alteration and the chemistry of crustal fl uids, the nature and signifi cance of subseafl oor microbial ecosystems, tec-tonic and volcanic characteristics of active margins, and the creation of hy-drate(More)