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      Expedition 336 summary

      Expedition 336 Scientists

      Proceedings of the IODP

      Integrated Ocean Drilling Program

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          Abstract

          Integrated Ocean Drilling Program (IODP) Expedition 336 successfully initiated subseafloor observatory science at a young mid-ocean-ridge flank setting. All of the drilled sites are located in the North Pond region of the Atlantic Ocean. This area is known from previous ocean drilling and site survey investigations as a site of particularly vigorous circulation of seawater in permeable 8 Ma basaltic basement underlying a <300 m thick sedimentary pile. Understanding how this seawater circulation affects microbial and geochemical processes in the uppermost basement was the primary science objective of Expedition 336. Major strides in ridge-flank studies have been made with subseafloor borehole observatories (CORKs) because they facilitate combined hydrological, geochemical, and microbiological studies and controlled experimentation in the subseafloor. During Expedition 336, two fully functional observatories were installed in two newly drilled holes and an instrument and sampling string were placed in an existing hole.

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          Most cited references 34

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          Revised calibration of the geomagnetic polarity timescale for the Late Cretaceous and Cenozoic

           S. C. Cande,  D. Kent (1995)
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            Iron and sulfide oxidation within the basaltic ocean crust: implications for chemolithoautotrophic microbial biomass production

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              Alteration of oceanic volcanic glass: textural evidence of microbial activity

              The subsurface biosphere may constitute as much as 50 percent of Earth's biomass. Direct and indirect evidence suggests that an extensive biosphere exists in the rocks below the sea floor. This survey of basalts of the Atlantic, Pacific, and Indian Oceans supports the hypothesis that bacteria have colonized much of the upper oceanic crust, which has a volume estimated at 10(18) cubic meters. Although this is the largest habitat on Earth, its low abundance of bacteria constitutes much less than 1 percent of Earth's biomass.
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                Author and article information

                Journal
                10.2204/iodp.proc.336.2012
                Proceedings of the IODP
                Integrated Ocean Drilling Program
                1930-1014
                16 November 2012
                10.2204/iodp.proc.336.101.2012

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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                Self URI (journal page): http://publications.iodp.org/

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