This dataset pertains to the manuscript titled 'Enhanced preservation of refractory organic carbon by reactive iron at the sulfate-methane transition in cold-seep sediments."

<b>Table S1. </b>The pore-water solutes in four push cores in site F. <b>Table S2. </b>The bulk parameters in four push cores in site F. <b>Table S3.</b> Microbial community compositions of the top 30 orders in sediments in site F. <b>Table S4.</b> Microbial community compositions of sulfate-reducing bacteria (SRB), anaerobic methanotrophic archaea (ANME) and sulfur-oxidizing bacteria (SOB) in sediments in site F.<b> </b>