| http://www.w3.org/ns/prov#value | - Electron acceptors such as oxygen or nitrate penetrate these oligotrophic sediments on a scale of meters (D???Hondt et al., 2004) or tens of meters (Gieskes and Boul??gue, 1986; D???Hondt et al., 2009), in contrast to organic-rich continental margin or shelf sediments where these strong electron acceptors are used up within centimeters.
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